NDLE cheat sheet

Tooth notation: universal 1–32; FDI uses two digits (quadrant 1–4 for permanent, 5–8 for primary, then tooth 1–8); Palmer uses quadrant brackets with 1–8.

Enamel is 96% mineral by weight, avascular and cannot regenerate; ameloblasts are lost after eruption, so caries and wear are permanent.

Dentin: ~70% mineral, 20% organic (mostly type I collagen), 10% water; dentinal tubules ~1–2.5 µm diameter, denser near pulp, and permit fluid movement that underlies hydrodynamic sensitivity.

Pulp is innervated mainly by A-delta fibers (myelinated, sharp pain) and C fibers (unmyelinated, dull pain); A-delta respond to dentinal fluid shift, C fibers to prolonged noxious stimuli.

Periodontal ligament principal fibers: alveolar crest, horizontal, oblique (most numerous, resists axial load), apical, and interradicular in molars.

Saliva: resting flow ~0.3–0.4 mL/min, stimulated 1.5–2 mL/min, daily 0.5–1.5 L; pH ~6.7–7.4; bicarbonate is the main buffer, plus phosphate and proteins.

Primary dentition erupts ~6 months to 2.5 years; permanent first molar at ~6 years, mandibular central incisor ~6–7 years; mixed dentition spans roughly 6–12 years.

Amelogenesis stages: morphogenic, secretory, maturation, protective; hypocalcification (maturation defect) leaves normal contour but chalky, opaque enamel.

Gingival sulcus depth in health is 0.5–3 mm; junctional epithelium attaches via hemidesmosomes and internal basal lamina, and migrates apically in periodontitis.

Mandibular nerve (V3) exits the skull through the foramen ovale; maxillary (V2) via foramen rotundum; ophthalmic (V1) via superior orbital fissure.

Inferior alveolar nerve enters via the mandibular foramen and exits at the mental foramen as the mental nerve, supplying lower lip and chin sensation.

Lingual nerve carries chorda tympani (taste from anterior two-thirds of tongue) and lies medial to the mandible, anterior to the inferior alveolar nerve.

Facial nerve exits the stylomastoid foramen; branches (temporal, zygomatic, buccal, marginal mandibular, cervical) run within the parotid gland, so parotid surgery risks facial palsy.

Muscles of mastication (masseter, temporalis, medial and lateral pterygoid) are all V3-innervated; lateral pterygoid opens and protrudes the mandible.

Tongue: hypoglossal nerve (XII) for motor; general sensation posterior third via glossopharyngeal (IX); taste posterior third via IX, anterior two-thirds via chorda tympani.

Maxillary artery branches include middle meningeal, inferior alveolar, and posterior superior alveolar; the pterygoid venous plexus lies nearby and can bleed profusely.

Carotid triangle contents: common carotid bifurcation, internal jugular vein, vagus nerve; the external carotid gives off superior thyroid, lingual, and facial branches.

Recurrent aphthous stomatitis: minor (<1 cm, heals in 10–14 days), major (>1 cm, scarring, weeks), herpetiform (multiple 1–3 mm clustered ulcers).

Leukoplakia is a clinical white patch that cannot be rubbed off and cannot be diagnosed as another disease; dysplasia on biopsy drives malignant transformation risk.

Erythroplakia has higher malignant transformation risk than leukoplakia; biopsy is mandatory.

Squamous cell carcinoma most common intraoral site is lateral tongue and floor of mouth; risk factors include tobacco, alcohol, and betel quid.

Odontogenic keratocyst: parakeratinized lining, palisaded basal layer, satellite cysts, high recurrence; associated with PTCH1 and nevoid basal cell carcinoma syndrome.

Ameloblastoma: odontogenic epithelium with reverse polarity and stellate reticulum-like areas; locally aggressive, commonly posterior mandible, requires resection.

Dentigerous cyst encloses the crown of an unerupted tooth at the cementoenamel junction; most common developmental odontogenic cyst.

Lichen planus: bilateral white striae (Wickham striae), basal cell degeneration and band-like lymphocytic infiltrate; erosive forms need biopsy and management.

Oral candidiasis forms: pseudomembranous (thrush, wipes off), erythematous, hyperplastic, angular cheilitis; predisposed by xerostomia, antibiotics, steroids, diabetes, HIV.

Caries pathogens: Streptococcus mutans and S. sobrinus (acidogenic, aciduric, synthesize glucans via glucosyltransferase); lactobacilli act as progressors.

Periodontitis keystone pathogen: Porphyromonas gingivalis; red complex also includes Tannerella forsythia and Treponema denticola.

Aggregatibacter actinomycetemcomitans associates with aggressive (grade C) periodontitis; it produces leukotoxin and cytolethal distending toxin.

Sterilization by steam autoclave: 121 °C at 15 psi for 15–20 min, or 132 °C for 3–4 min; biological indicator is Geobacillus stearothermophilus spores.

Dry heat sterilization: 160 °C for 2 hours or 170 °C for 1 hour; chemical vapor uses unsaturated formaldehyde-alcohol at ~131 °C.

Spore test for ethylene oxide is Bacillus atrophaeus; high-level disinfection (e.g., glutaraldehyde 2%) is used for heat-sensitive semicritical items.

Standard precautions apply to all patients; PPE includes gloves, mask, eye protection, and gown; hand hygiene is the single most effective prevention measure.

Immunoglobulins: IgA is the dominant secretory antibody in saliva; IgG crosses placenta; IgM is the first responder; IgE mediates type I hypersensitivity.

Needlestick injury: wash with soap and water, report immediately, and assess HIV/HBV/HCV post-exposure prophylaxis; HBV risk is highest without vaccination.

Local anesthetic pKa determines onset: higher pKa means more ionized drug at tissue pH and slower onset; inflamed tissue (low pH) traps anesthetic in ionized form and reduces efficacy.

Amide anesthetics (lidocaine, articaine, bupivacaine, mepivacaine) are metabolized in liver; ester anesthetics (benzocaine, procaine) by plasma pseudocholinesterase.

Maximum doses: lidocaine 4.4 mg/kg (7 mg/kg with epinephrine), articaine 7 mg/kg, mepivacaine 6.6 mg/kg, bupivacaine 1.6 mg/kg; 1 cartridge of 2% lidocaine = 36 mg.

Epinephrine concentration 1:100,000 = 0.01 mg/mL; 1:200,000 = 0.005 mg/mL; a 1.8 mL cartridge of 1:100,000 contains 0.018 mg epinephrine.

NSAIDs inhibit COX-1 and COX-2; ibuprofen 400–600 mg q6h is standard post-operative analgesia; aspirin's antiplatelet effect lasts the platelet lifespan (~7–10 days).

Antibiotic prophylaxis for infective endocarditis is required for high-risk cardiac conditions (prosthetic valve, prior IE, certain congenital heart disease); amoxicillin 2 g orally 30–60 min before procedure.

Clindamycin is no longer recommended for endocarditis prophylaxis; alternatives include cephalexin, azithromycin, or doxycycline when penicillin-allergic.

Penicillin allergy: cross-reactivity with cephalosporins is low (~1–2%); true anaphylaxis requires alternative such as clindamycin or azithromycin.

Bisphosphonate-related osteonecrosis risk rises with IV potency and duration; avoid elective extractions in high-risk patients and consider drug holiday only with physician input.

Cavity classification: Class I pits/fissures; II posterior proximal; III anterior proximal; IV anterior proximal involving incisal angle; V cervical third; VI incisal edge.

Amalgam: high compressive strength, no adhesive bond, requires retention form; contraindicated in esthetic areas and in patients with true mercury allergy.

Composite resin: Bis-GMA/UDMA matrix with silane-treated filler; polymerization shrinkage ~2–3% causes marginal stress; incremental layering reduces C-factor effects.

Etching enamel with 35–37% phosphoric acid for 15–30 s creates microporosity for micromechanical retention; dentin etching is shorter (10–15 s).

Bonding generations: total-etch (4th/5th), self-etch (6th/7th), universal adhesives; self-etch is less technique-sensitive but weaker on uncut enamel.

Glass ionomer releases fluoride and bonds chemically to tooth; low fracture toughness, so place in low-stress areas or as a liner/base.

Zinc oxide-eugenol is sedative and obtundent but inhibits composite polymerization; use a resin-modified or non-eugenol base under composites.

Rubber dam isolation improves moisture control, retraction, and safety; clamp selection depends on tooth anatomy (e.g., winged clamps for molars).

Marginal adaptation: cervical margin of Class II composite should be beveled or placed supragingivally; open margins predispose to recurrent caries.

Working length is typically 0.5–1.0 mm short of the radiographic apex; electronic apex locators measure impedance change at the apical constriction.

Root canal irrigants: sodium hypochlorite 0.5–5.25% dissolves organic tissue and is antimicrobial; EDTA 17% chelates smear layer; chlorhexidine does not dissolve tissue.

NaOCl and chlorhexidine must not be mixed directly - a brown precipitate (para-chloroaniline) forms; flush with saline between them.

Access cavity shapes: maxillary central incisor triangular, mandibular incisor lingual rectangular, premolars oval, molars trapezoidal or rhomboid.

Maxillary first molar has three roots and typically MB1, MB2, DB, and palatal canals; MB2 is present in the majority of cases.

Rotary nickel-titanium files have shape-memory and superelasticity; torque-controlled motors reduce breakage; glide path creation precedes shaping.

Obturation with gutta-percha and sealer; cold lateral condensation or warm vertical compaction; sealer should be radiopaque and dimensionally stable.

Post-endodontic restoration: cuspal coverage (onlay/crown) for molars and premolars with large loss; posts are needed only when retention is insufficient.

Pulpal diagnosis: reversible pulpitis (provoked, short duration), irreversible (spontaneous, lingering), necrotic (no response); periapical diagnosis by percussion and radiographic changes.

Gingivitis is reversible inflammation confined to gingiva; periodontitis involves attachment loss and alveolar bone loss with clinical attachment level measurement.

Probing depth alone does not diagnose periodontitis; loss of attachment and radiographic bone loss are required.

2017 classification uses staging (I–IV by severity and complexity) and grading (A–C by progression rate and risk).

Nonsurgical therapy: scaling and root planing with reevaluation at 6–8 weeks; adjuncts include local delivery of antimicrobials and systemic antibiotics in selected cases.

Pocket reduction surgery (open flap debridement) is indicated for residual pockets ≥5 mm with inflammation after nonsurgical therapy.

Regenerative procedures (guided tissue regeneration, bone grafts, enamel matrix derivative) require intrabony defects with adequate defect morphology and plaque control.

Risk factors: tobacco smoking (dose-dependent), diabetes (HbA1c), poor plaque control, and genetic susceptibility; smoking also reduces bleeding on probing.

Maintenance therapy every 3–6 months reduces recurrence; recall interval depends on risk profile and residual pocket depth.

Peri-implant mucositis is reversible inflammation without bone loss; peri-implantitis adds progressive bone loss and requires decontamination and surgical management.

Complete denture support comes from mucosa and underlying bone; retention depends on border seal, saliva, and adaptation; stability resists horizontal forces.

Balanced occlusion in complete dentures: bilateral simultaneous contacts in centric relation and eccentric movements to prevent tipping.

Posterior palatal seal is placed at the junction of hard and soft palate to improve retention; vibrating line is the landmark.

Fixed partial denture abutment selection: crown-root ratio ideally ≥1:1; splinting increases load on abutments; cantilevers increase stress on the nearest abutment.

Occlusal scheme for implant-supported restorations: mutually protected occlusion with light centric contacts; avoid heavy lateral forces on implants due to lack of proprioception.

Vertical dimension of occlusion is assessed by rest position minus freeway space (~2–4 mm); loss of VDO leads to angular cheilitis and reduced masticatory efficiency.

Resin-bonded bridges require enamel coverage and moisture control; survival is lower than conventional FPDs but preserve tooth structure.

Removable partial denture design: rest seats direct forces along the long axis; clasps provide retention; major connector rigidity distributes load.

Shade matching: use daylight-balanced lighting, view at arm's length, and account for metamerism; enamel translucency and dentin chroma determine final shade.

Third molar extraction difficulty increases with impaction depth (Pell and Gregory), root morphology, and proximity to the inferior alveolar canal.

Inferior alveolar nerve block targets the mandibular foramen; landmarks include the coronoid notch and pterygomandibular raphe; use a 25-gauge long needle.

Signs of intravascular injection: rapid onset of tachycardia, palpitations, and CNS excitement; aspirate before injecting.

Local anesthetic toxicity: CNS excitation followed by depression, then cardiovascular collapse; manage with airway support and lipid emulsion for bupivacaine.

Dry socket (alveolar osteitis) presents 2–4 days post-extraction with severe pain and empty socket; treat with irrigation and medicated dressing.

Post-extraction bleeding: apply pressure, identify local causes (granulation tissue, arteriole), and consider systemic causes (platelet disorders, anticoagulants).

Orthognathic surgery: Le Fort I osteotomy for maxillary repositioning; bilateral sagittal split osteotomy for mandibular advancement; genioplasty for chin.

Odontogenic infection spread follows fascial planes; submandibular space involvement can progress to Ludwig's angina, requiring airway management and IV antibiotics.

Antibiotic prophylaxis for surgical site infection is not routine for uncomplicated extractions in healthy patients; reserve for compromised hosts or extensive procedures.

Cementum is ~45–50% mineral, avascular, and continues to form throughout life; acellular cementum covers the cervical third, cellular cementum the apical third.

Enamel rods run from the dentinoenamel junction to the surface; rod direction affects cavity preparation (unsupported enamel rods fracture if not planned).

Pulp chamber size decreases with age due to secondary dentin deposition; this is relevant to endodontic access and restorative depth.

Gingival fibers (dentogingival, dentoperiosteal, alveologingival, circular) maintain gingival tone and resist apical migration.

Osteoblasts form bone and express alkaline phosphatase; osteoclasts resorb bone and are multinucleated; RANKL/OPG ratio controls osteoclastogenesis.

Masticatory forces: incisors ~100–200 N, molars ~400–800 N; parafunction can exceed these and cause abfraction or restoration failure.

Taste buds are located in fungiform, foliate, and circumvallate papillae; filiform papillae have no taste buds and provide mechanical function.

The pterygomandibular space contains the inferior alveolar and lingual nerves and is entered during the inferior alveolar nerve block.

The maxillary sinus floor lies close to the roots of maxillary posterior teeth; sinus perforation risk is highest for maxillary first and second molars.

The greater palatine foramen is located medial to the third molar region; the greater palatine nerve supplies the posterior palate.

The temporomandibular joint is a synovial joint with a fibrocartilaginous disc; the lateral pterygoid muscle inserts on the disc and condyle.

The submandibular gland duct (Wharton's duct) opens at the sublingual caruncle; the parotid duct (Stensen's duct) opens at the parotid papilla opposite the maxillary second molar.

The internal jugular vein lies lateral to the common carotid artery; the vagus nerve runs in the carotid sheath between them.

The ansa cervicalis supplies infrahyoid muscles; the accessory nerve (XI) supplies trapezius and sternocleidomastoid.

Pleomorphic adenoma is the most common salivary gland tumor, usually in the parotid; it has a capsule and risk of recurrence if ruptured.

Mucoepidermoid carcinoma is the most common malignant salivary tumor; grading depends on cystic component and cellular atypia.

Fibroma (irritation fibroma) is a reactive fibrous nodule, common on the buccal mucosa along the occlusal line.

Pyogenic granuloma is a vascular reactive lesion, common on the gingiva during pregnancy; it bleeds easily.

Oral hairy leukoplakia on the lateral tongue is associated with Epstein-Barr virus and HIV immunosuppression.

Herpes simplex primary infection causes gingivostomatitis; recurrent infection causes cold sores triggered by stress, sunlight, or fever.

Pemphigus vulgaris shows intraepithelial separation (suprabasal clefting) and positive Nikolsky sign; mucous membrane pemphigoid shows subepithelial separation.

Dental unit waterlines harbor biofilm; flush lines and use independent water reservoirs or filters to reduce microbial counts.

Surface disinfection: use EPA-registered hospital disinfectant with tuberculocidal activity; barriers protect surfaces that are difficult to disinfect.

Handpiece sterilization requires autoclaving after cleaning and lubrication; follow manufacturer instructions for wrapped vs unwrapped cycles.

Hepatitis B is the most infectious bloodborne pathogen per needlestick exposure; vaccination and post-exposure immunoglobulin are key.

HIV transmission risk per needlestick is ~0.3%; post-exposure prophylaxis should start within hours.

Aerosol-generating procedures require high-volume evacuation and N95 or equivalent respiratory protection in high-risk settings.

Innate immunity includes neutrophils and macrophages; adaptive immunity involves B cells (antibody) and T cells (cell-mediated).

Analgesic ladder for dental pain: NSAIDs first-line, add acetaminophen or opioids only when contraindicated or severe.

Acetaminophen maximum adult dose is 3–4 g/day; reduce in hepatic impairment and avoid in chronic alcohol use.

Antibiotics are adjuncts to source control; they do not replace drainage or extraction.

Metronidazole is effective against anaerobic periodontal pathogens; avoid alcohol during therapy (disulfiram-like reaction).

Corticosteroids reduce post-operative edema but impair healing and immunity; use short courses only when indicated.

Anticoagulant management: do not stop warfarin for routine dental care if INR is therapeutic; local hemostatic measures suffice.

Drug interactions: erythromycin and azole antifungals inhibit CYP3A4 and raise levels of statins and some sedatives.

C-factor is bonded surface area divided by unbonded surface area; high C-factor increases polymerization shrinkage stress.

Flowable composite has lower filler content and higher shrinkage; use in small increments or as a liner.

Amalgam bond strength is low without adhesive; retention form (undercuts, grooves) is essential.

Ceramic restorations require adequate occlusal reduction (1.5–2 mm) and chamfer or shoulder margins for strength.

Zirconia has high flexural strength and requires airborne-particle abrasion and MDP-containing primer for bonding.

Dentin bonding requires moist dentin with total-etch; over-drying collapses collagen and reduces bond strength.

Occlusal adjustment should be done after restoration placement with articulating paper and verified in centric and excursive movements.

Canal morphology: maxillary first premolar often has two canals; mandibular first molar has mesial (two canals) and distal (one or two) roots.

Reciprocating and rotary systems require patency and glide path; file separation risk increases with curved canals and excessive torque.

Apical patency is maintained with a small file (e.g., #10) to prevent debris packing and loss of working length.

Intracanal medicaments: calcium hydroxide is antimicrobial and dissolves tissue remnants; remove before obturation to avoid sealer interference.

Endodontic retreatment requires removal of old filling material, re-establishing patency, and addressing missed canals or perforations.

Vertical root fracture presents with deep narrow pocketing and J-shaped radiolucency; extraction is usually required.

Post-operative pain after endodontics is common; occlusal reduction and analgesics help; persistent pain suggests incomplete cleaning or fracture.

Bleeding on probing indicates active inflammation; absence of bleeding has high negative predictive value for stability.

Furcation involvement is classified I–IV; grade II–III may require tunneling, root resection, or regeneration depending on anatomy.

Mucogingival defects: free gingival graft or connective tissue graft increases keratinized tissue and root coverage.

Crown lengthening involves ostectomy and gingivectomy to expose sound tooth structure for restoration.

Systemic antibiotics (e.g., amoxicillin plus metronidazole) may be used as adjuncts in grade C periodontitis but not as monotherapy.

Smoking cessation improves periodontal outcomes; smokers show less bleeding and poorer response to therapy.

Peri-implant maintenance includes probing, radiographic monitoring, and plaque control; early detection of bone loss improves salvage.

Occlusal vertical dimension is restored gradually in complete dentures; excessive opening causes soreness and phonetic problems.

Centric relation is the maxillomandibular relationship with the condyles in their most anterior-superior position against the articular eminence.

Impression materials: alginate is hydrocolloid and dimensionally unstable; elastomers (polyether, vinyl polysiloxane) are stable and accurate.

Denture teeth selection depends on arch form, lip support, and shade; posterior teeth should have balanced contacts.

Implant crown cementation requires complete removal of excess cement to prevent peri-implantitis.

Screw-retained implant restorations allow retrievability but require precise implant position and angulation.

Occlusal splints are used for bruxism and TMD; they do not cure bruxism but protect teeth and reduce load.

Informed consent for surgery includes risks, benefits, alternatives, and the possibility of nerve injury or bleeding.

Suture removal timing: 5–7 days for oral mucosa; longer for skin.

Post-operative instructions include ice, soft diet, avoidance of smoking, and analgesic schedule.

Maxillary sinus communication after extraction may require primary closure and sinus precautions; avoid nose blowing.

Orthognathic surgery planning uses cephalometric analysis and model surgery; stability depends on fixation and muscle forces.

Sedation levels: minimal, moderate, deep, and general anesthesia; airway monitoring is required for moderate and deeper sedation.

Local anesthetic failure in inflamed tissue is due to low pH trapping the ionized form; consider alternative techniques or supplemental anesthesia.

Enamel maturation involves removal of protein and water and mineral deposition; fluorapatite formation increases acid resistance.

Dentin permeability decreases with age due to sclerosis and secondary dentin, reducing sensitivity.

Pulp blood flow is high relative to volume; inflammation in a rigid chamber raises tissue pressure and can cause necrosis.

Osteocytes communicate via canaliculi; bone remodeling is coupled with resorption and formation.

Salivary glands: parotid (serous), submandibular (mixed), sublingual (mucous); minor glands contribute to mucosal lubrication.

Masticatory cycle includes opening, closing, and occlusal phases; the mandible moves in a complex pattern controlled by muscles and TMJ.

Tooth eruption involves root formation, bone remodeling, and periodontal ligament development.

The facial artery crosses the mandible at the antegonial notch and supplies the lips and nose.

The superficial temporal artery is a terminal branch of the external carotid and supplies the scalp and TMJ.

The maxillary nerve (V2) exits the infraorbital foramen as the infraorbital nerve, supplying the midface.

The chorda tympani joins the lingual nerve in the infratemporal fossa and carries taste and parasympathetic fibers to the submandibular ganglion.

The hypoglossal nerve crosses the carotid arteries and supplies all intrinsic and most extrinsic tongue muscles.

The buccinator muscle is supplied by the facial nerve and keeps food between the teeth during chewing.

The medial pterygoid muscle elevates and protrudes the mandible; the lateral pterygoid depresses and protrudes.

Oral submucous fibrosis is associated with betel quid and causes progressive fibrosis and restricted mouth opening; malignant transformation risk is significant.

Actinic cheilitis affects the lower lip due to sun exposure and may progress to squamous cell carcinoma.

Median rhomboid glossitis is a central dorsal tongue erythematous area associated with Candida.

Geographic tongue (benign migratory glossitis) shows migrating erythematous patches with white borders and usually needs no treatment.

Hairy tongue results from elongated filiform papillae and is associated with smoking, antibiotics, and poor oral hygiene.

Osteoradionecrosis occurs after radiotherapy; avoid elective extractions in irradiated fields and consider hyperbaric oxygen in selected cases.

Burning mouth syndrome is often idiopathic and associated with xerostomia, nutritional deficiencies, or psychological factors.

Biofilm formation stages: initial attachment, microcolony formation, maturation, and dispersal; mechanical disruption is essential.

Caries is a biofilm-mediated disease driven by frequent sugar exposure and low pH; fluoride promotes remineralization.

Periodontal pathogens are anaerobic and Gram-negative; subgingival plaque sampling is not routine in clinical practice.

Sterilization monitoring includes mechanical (gauges), chemical (indicators), and biological (spore tests) methods.

Infection control breaches include improper handpiece sterilization and contaminated waterlines; both are preventable with protocols.

Immunization of dental staff against hepatitis B is recommended; post-exposure prophylaxis depends on vaccination status.

Antibiotic resistance is promoted by unnecessary prescribing; source control and narrow-spectrum agents are preferred.

Local anesthetic with epinephrine prolongs duration and reduces systemic absorption; avoid in patients with uncontrolled hypertension or severe cardiovascular disease.

Prilocaine can cause methemoglobinemia at high doses; avoid in patients with methemoglobinemia or those taking oxidizing drugs.

Articaine contains a thiophene ring and has high lipid solubility; it is metabolized in plasma and liver.

Sedative agents: benzodiazepines cause respiratory depression; flumazenil reverses benzodiazepines.

Opioid analgesics cause constipation and respiratory depression; naloxone reverses opioids.

Antifungal therapy for oral candidiasis: nystatin suspension or clotrimazole troches; systemic fluconazole for refractory cases.

Antiviral therapy for herpes: acyclovir or valacyclovir started within 72 hours of onset reduces duration.

Cavity preparation principles: remove infected dentin, preserve sound tooth structure, and provide retention and resistance form.

Resistance form prevents fracture of the restoration and tooth; retention form prevents displacement.

Liners and bases protect the pulp; calcium hydroxide stimulates reparative dentin but has low strength.

Glass ionomer bonds chemically to dentin and enamel and releases fluoride; it is useful in pediatric and geriatric patients.

Composite polishing reduces plaque accumulation and staining; use fine grits and avoid overheating.

Amalgam carving and burnishing improve marginal adaptation; avoid overcarving and leave adequate bulk.

Occlusal contacts should be checked in centric and excursive movements after any restoration.

Access preparation should be done with magnification and proper illumination; complete removal of the chamber roof is essential.

Canal length determination: radiographic and electronic methods should agree; if not, re-evaluate.

Irrigation activation (ultrasonic or sonic) improves tissue removal and disinfection in complex anatomy.

Obturation quality is assessed by length, density, and taper; voids increase failure risk.

Endodontic failure causes include missed canals, inadequate cleaning, coronal leakage, and fractures.

Apicoectomy is indicated when nonsurgical retreatment is not feasible or fails; root-end filling improves seal.

Post-operative instructions include avoiding hard chewing until the final restoration is placed.

Periodontal probing should be done gently with a controlled force (~0.25 N) to avoid false readings.

Radiographic bone loss is measured from the cementoenamel junction to the alveolar crest; >2 mm suggests periodontitis.

Scaling and root planing requires adequate anesthesia and thorough instrumentation of all pockets.

Local delivery of minocycline or chlorhexidine chips is an adjunct to scaling and root planing, not a substitute.

Gingival recession can be treated with connective tissue grafts; root coverage depends on defect classification.

Implant placement requires adequate bone volume; grafting may be needed before or during placement.

Smoking cessation and glycemic control improve periodontal and implant outcomes.

Denture base materials: acrylic resin is common; metal bases provide strength and thermal conductivity.

Occlusal records for complete dentures include centric relation and protrusive records for articulation.

Try-in stage verifies esthetics, phonetics, and occlusion before processing.

Denture delivery includes occlusal adjustment and instructions for adaptation and hygiene.

Implant-supported overdentures require adequate attachments and hygiene access; locator attachments are common.

Fixed dental prosthesis impression should capture margins and finish lines accurately; use retraction cord for gingival displacement.

Provisional restorations protect prepared teeth and maintain esthetics and occlusion during laboratory phases.

Surgical extraction of impacted third molars requires assessment of root morphology and proximity to the inferior alveolar canal on imaging.

Coronectomy may be considered when roots are intimately associated with the inferior alveolar nerve.

Post-operative swelling peaks at 2–3 days and resolves over a week; ice and anti-inflammatory drugs help.

Trismus after surgery is usually temporary; persistent trismus suggests infection or hematoma.

Nerve injury during surgery may present as paresthesia; document and monitor; most resolve within months.

Ludwig's angina requires urgent airway management, IV antibiotics, and surgical drainage.

Orthognathic surgery complications include relapse, nerve injury, and fixation failure; long-term follow-up is needed.

Tooth development stages: bud, cap, bell, and apposition; enamel organ and dental papilla interact to form the tooth.

Ameloblasts secrete enamel matrix that mineralizes; maturation involves protein removal and crystal growth.

Odontoblasts form dentin and leave odontoblastic processes in tubules; dentin continues to form throughout life.

Cementum formation begins at the cementoenamel junction and progresses apically; cementoblasts are derived from the dental follicle.

Periodontal ligament fibers are embedded in cementum and bone; they transmit forces and allow tooth movement.

Alveolar bone development follows tooth eruption; extraction leads to bone resorption.

Salivary flow decreases with age and medications; xerostomia increases caries and mucosal discomfort.

The foramen rotundum transmits the maxillary nerve; the foramen ovale transmits the mandibular nerve and accessory meningeal artery.

The stylomastoid foramen transmits the facial nerve; the jugular foramen transmits cranial nerves IX, X, and XI.

The hypoglossal canal transmits the hypoglossal nerve.

The infraorbital foramen is located below the orbit and transmits the infraorbital nerve.

The mental foramen is located on the mandible and transmits the mental nerve.

The greater palatine canal transmits the greater palatine nerve and vessels.

The incisive canal transmits the nasopalatine nerve and vessels.

Oral cancer screening includes visual and tactile examination of all oral mucosa, including the floor of the mouth and lateral tongue.

Suspicious lesions should be biopsied; brush cytology is not a substitute for biopsy.

Leukoplakia management includes elimination of irritants and biopsy of persistent lesions.

Oral lichen planus has a small malignant transformation risk; long-term follow-up is recommended.

Sjögren syndrome causes xerostomia and xerophthalmia; biopsy of minor salivary glands shows lymphocytic infiltrate.

Oral manifestations of HIV include candidiasis, hairy leukoplakia, and Kaposi sarcoma.

Nutritional deficiencies (B12, folate, iron) can cause glossitis and oral ulcers.

Sterilization fails if instruments are not cleaned first; organic debris protects microorganisms.

Packaging must allow steam penetration and maintain sterility; use appropriate pouches and indicators.

Storage of sterilized instruments should be in a dry, closed area; shelf life depends on packaging.

Hand hygiene includes soap and water or alcohol-based hand rub; wash visibly soiled hands.

Gloves do not replace hand hygiene; remove gloves and wash hands after patient contact.

Sharps should be disposed of in puncture-resistant containers immediately after use.

Vaccination of dental personnel against hepatitis B, influenza, and other diseases is recommended.

Local anesthetic maximum doses should be calculated by body weight and adjusted for age and medical status.

Epinephrine in local anesthetics can cause tachycardia and hypertension; monitor vital signs.

Aspiration before injection reduces intravascular injection risk.

Systemic antibiotics should be chosen based on likely pathogens and local resistance patterns.

Analgesic combinations should be tailored to pain severity and patient comorbidities.

Medication reconciliation should include over-the-counter drugs and supplements that affect bleeding or healing.

Pregnancy considerations: avoid certain drugs (e.g., tetracyclines) and use the lowest effective dose.

Cavity preparation should be conservative; preserve enamel margins and avoid unsupported enamel.

Bonding agents require strict moisture control; contamination reduces bond strength.

Composite layering should avoid thick increments to reduce shrinkage stress and ensure curing.

Curing lights should be tested regularly; inadequate curing leads to restoration failure.

Amalgam should be handled with proper mercury hygiene; use capsules and waste disposal.

Ceramic restorations should be tried in and adjusted before cementation; check occlusion and contacts.

Post-operative sensitivity after composite may be due to bonding issues or pulpal inflammation; monitor and adjust occlusion.

Rubber dam isolation is essential for endodontic treatment to prevent contamination and protect the airway.

Access cavity should be checked for additional canals with magnification and troughing.

Irrigation should be delivered slowly to avoid extrusion beyond the apex.

Sodium hypochlorite accident causes severe pain and swelling; manage with irrigation with saline and supportive care.

Obturation should be verified radiographically; overextension or underextension requires correction.

Coronal seal after endodontics is critical; temporary restorations should be replaced promptly with definitive restorations.

Follow-up radiographs assess healing; persistent apical radiolucency may indicate failure.

Periodontal maintenance includes plaque control, scaling, and risk assessment at each visit.

Local risk factors include calculus, overhanging restorations, and anatomic grooves.

Systemic risk factors include diabetes, smoking, and immunosuppression.

Gingival overgrowth can be caused by medications (e.g., phenytoin, calcium channel blockers); management includes medication change and surgery.

Periodontal abscess requires drainage and debridement; antibiotics are adjuncts.

Implantitis treatment includes mechanical debridement, antiseptics, and surgical intervention in advanced cases.

Patient compliance with oral hygiene is a major determinant of long-term success.

Complete denture retention depends on border seal, saliva, and adaptation; stability depends on occlusion and anatomy.

Occlusal schemes for complete dentures should provide balanced contacts to prevent tipping.

Implant overdentures require adequate attachment maintenance and hygiene.

Fixed prosthodontics requires accurate impressions and margin placement; supragingival margins are easier to maintain.

Provisional restorations should be adjusted to avoid occlusal trauma and maintain gingival health.

Shade matching should consider lighting and adjacent teeth; use a systematic approach.

Occlusal adjustments should be done with articulating paper and verified in all movements.

Pre-operative assessment includes medical history, medications, allergies, and airway evaluation.

Informed consent should be documented and include risks specific to the procedure.

Local anesthetic choice depends on procedure duration and patient medical status.

Sedation monitoring includes vital signs, oxygen saturation, and airway patency.

Post-operative instructions should include warning signs of infection or bleeding.

Suture technique affects wound healing; use appropriate material and tension.

Follow-up visits should assess healing and address complications early.

Enamel is thickest at cusps and thinnest at cervical margins; this affects cavity preparation and wear patterns.

Dentin tubules are S-shaped in coronal dentin and straighter in root dentin; this affects sensitivity and bonding.

Pulp horns extend into cusps; preparation depth should avoid exposure.

Cementoenamel junction can be overlapping, butt, or gap; this affects periodontal attachment and root sensitivity.

Alveolar bone has cortical and cancellous components; tooth extraction leads to dimensional changes.

Salivary pH and buffering capacity affect caries risk; testing can guide prevention.

Masticatory efficiency depends on occlusal contacts and muscle function.

The temporalis muscle inserts on the coronoid process and retracts the mandible.

The masseter muscle elevates the mandible and is palpated at the angle of the mandible.

The medial pterygoid muscle forms the medial wall of the infratemporal fossa.

The lateral pterygoid muscle has superior and inferior heads; the inferior head depresses and protrudes the mandible.

The facial nerve branches within the parotid gland; surgery risks facial palsy.

The lingual nerve can be injured during third molar surgery; assess sensation post-operatively.

The inferior alveolar nerve can be injured during implant placement; use imaging and careful planning.

Oral ulcers can be traumatic, infectious, immune-mediated, or neoplastic; biopsy persistent ulcers.

Recurrent aphthous ulcers are common and usually self-limiting; topical corticosteroids may help.

Herpes labialis is treated with topical or systemic antivirals if started early.

Oral candidiasis is common in denture wearers; treat with antifungals and denture hygiene.

Leukoplakia and erythroplakia require biopsy to rule out dysplasia or carcinoma.

Oral cancer prognosis depends on stage and site; early detection improves survival.

Xerostomia management includes hydration, sugar-free gum, and saliva substitutes.

Infection control protocols should be reviewed regularly and staff trained.

Sterilization logs should be maintained for traceability.

Handpieces require cleaning and lubrication before sterilization.

Surface barriers reduce contamination and should be changed between patients.

Waterlines should be flushed and treated to reduce biofilm.

Waste disposal should follow local regulations; sharps and biohazard waste are separated.

Post-exposure protocols should be posted and accessible.

Analgesic selection should consider patient allergies, renal and hepatic function, and interactions.

NSAIDs should be avoided in patients with peptic ulcer disease or renal impairment.

Acetaminophen is hepatotoxic in overdose; counsel patients on maximum daily dose.

Antibiotics should be prescribed for the shortest effective duration.

Local anesthetics should be used at the lowest effective dose; calculate maximum doses.

Epinephrine should be avoided in patients with uncontrolled hyperthyroidism or pheochromocytoma.

Medication interactions should be checked before prescribing new drugs.

Cavity preparation should consider enamel rod direction to avoid unsupported enamel.

Bonding to enamel is more predictable than to dentin; use appropriate etch and primer.

Composite should be cured in increments no thicker than manufacturer recommendations.

Curing light intensity should be checked; low output leads to undercuring.

Amalgam should be condensed to avoid voids and carved to restore anatomy.

Ceramic restorations require adequate thickness and support; avoid sharp internal angles.

Occlusal adjustment should be done after cementation and verified.

Access cavity should allow straight-line access to canals; avoid leaving ledges.

Working length should be confirmed with apex locator and radiograph.

Irrigation should include sodium hypochlorite and EDTA; avoid mixing with chlorhexidine.

Obturation should fill the canal three-dimensionally; voids increase failure.

Coronal restoration should be placed promptly to prevent leakage.

Follow-up should assess symptoms and radiographic healing.

Retreatment should address missed canals and inadequate fills.

Periodontal assessment includes probing depths, bleeding on probing, and attachment loss.

Risk assessment should include smoking, diabetes, and genetics.

Nonsurgical therapy is first-line; surgery is for residual pockets.

Maintenance intervals should be individualized based on risk.

Implant maintenance should include probing and radiographic monitoring.

Patient education should emphasize plaque control and risk factor modification.

Periodontal therapy should be coordinated with restorative and prosthodontic care.

Complete denture impressions should capture borders and anatomy; border molding improves seal.

Jaw relations should be recorded accurately; errors cause occlusal problems.

Try-in should verify esthetics, phonetics, and occlusion.

Denture delivery should include occlusal adjustment and instructions.

Implant restorations should be designed to allow hygiene and maintenance.

Fixed prosthodontics should consider margin placement and occlusion.

Provisional restorations should protect teeth and maintain function.

Pre-operative imaging should assess anatomy and pathology.

Surgical planning should include assessment of risks and alternatives.

Anesthesia should be tailored to patient medical status and procedure.

Post-operative care should include pain control and infection prevention.

Complications should be recognized and managed promptly.

Follow-up should assess healing and function.

Documentation should be complete and accurate.