Egypt Dentistry Licensure Exam key terms

Limited ability to open the mouth, usually measured as interincisal distance below about 35 mm. Common causes include muscle spasm after injection or surgery, infection, trauma, and temporomandibular joint disorders.

Rapidly spreading cellulitis of the submandibular and sublingual spaces, often of odontogenic origin, that can obstruct the airway. It presents with a firm, board-like floor of mouth and requires urgent airway assessment and surgical drainage.

Exposed irradiated bone that fails to heal for three months or more without recurrent tumor. It follows high-dose radiotherapy, typically after a dental extraction, and is managed with conservative care, antibiotics, and sometimes surgery or hyperbaric oxygen.

Localized alveolar osteitis after extraction, with severe throbbing pain from a few days after surgery, an empty socket, and exposed bone. Loss of the blood clot is the key feature; treatment is irrigation and a medicated dressing.

Three-dimensional X-ray imaging that uses a cone-shaped beam and a flat panel detector to show bone and teeth. It gives lower dose and higher spatial resolution than medical CT but poorer soft-tissue contrast.

Radiolucent structures appear dark because they absorb few X-rays, such as pulp, soft tissue, and caries. Radiopaque structures appear light because they absorb more, such as enamel, metal, and bone.

The height of bone supporting the tooth, measured on radiographs from the cementoenamel junction to the bone crest. Horizontal or vertical loss beyond about 2 mm suggests periodontitis and guides prognosis.

The distance from the cementoenamel junction to the base of the gingival sulcus or pocket, measured with a periodontal probe. It reflects cumulative attachment loss and is the standard measure of periodontal destruction.

The distance from the gingival margin to the base of the sulcus or pocket, recorded with a periodontal probe. It is influenced by inflammation and recession, so it is interpreted together with attachment level.

Direct structural and functional connection between living bone and the surface of a load-bearing implant, without intervening soft tissue. It depends on primary stability, biocompatible material, and controlled loading during healing.

Inflammation of peri-implant mucosa with progressive loss of supporting bone around an implant. Risk factors include plaque, smoking, and a history of periodontitis; treatment combines debridement with surgical or nonsurgical approaches.

Progressive loss of alveolar bone height and width after tooth extraction, fastest in the first year and continuing lifelong. It reduces denture support and retention and influences the timing of implant placement.

Arrangement of complete denture teeth so that contacts occur simultaneously and bilaterally in centric relation and are maintained during excursive movements. It stabilizes dentures and protects the supporting tissues.

The distance between the maxilla and mandible when the teeth or occlusion rims are in contact. It is assessed at rest and during speech and is restored carefully because excessive opening causes discomfort and premature contacts.

The distance from a coronal reference point to the apical constriction or intended endpoint of root canal preparation. It is determined by radiographs and apex locators to avoid short or overextended instrumentation.

The narrowest part of the root canal near the apical foramen, typically 0.5 to 1 mm short of the radiographic apex. It is the ideal apical limit for cleaning, shaping, and obturation.

Microscopic debris of dentin, pulp remnants, and bacteria created on canal walls by instrumentation. It can block dentinal tubules and harbor organisms, so chelating agents such as EDTA are used to remove it.

Antimicrobial irrigation solution used during root canal treatment to dissolve organic tissue and disinfect the canal. Concentration and volume vary; extrusion beyond the apex can cause severe pain and tissue damage.

Layer formed when dentin bonding resin infiltrates demineralized collagen and polymerizes, creating micromechanical retention. Its quality depends on moisture control, etching strategy, and solvent removal.

Volume reduction of resin composite as monomers convert to polymer during curing. It creates contraction stress at bonded interfaces and can cause marginal gaps, postoperative sensitivity, and recurrent caries.

The line where enamel ends and cementum begins at the tooth cervix. Its relationship to the gingival margin, with enamel, cementum, or both exposed, affects periodontal measurements and root sensitivity.

Fibrous connective tissue between the tooth root cementum and alveolar bone. It anchors the tooth, transmits occlusal force, contains proprioceptors, and provides a blood supply and cells for repair.

Highly mineralized, acellular outer layer of the crown, formed by ameloblasts and composed mainly of hydroxyapatite. It cannot regenerate; once lost to caries or wear, it is replaced only artificially.

Vital, tubular hard tissue beneath enamel and cementum, formed by odontoblasts. Its permeability and tubular structure explain sensitivity and the spread of caries toward the pulp.

Preoperative antibiotics given to selected patients before dental procedures to prevent infective endocarditis or joint infection. Guidelines restrict it to high-risk cardiac conditions and specific invasive procedures.

Infection of the heart valves or endocardium, sometimes following bacteremia from dental procedures. Prevention focuses on oral hygiene and targeted prophylaxis for the highest-risk cardiac patients.

Infection-control practices applied to all patients regardless of diagnosis, including hand hygiene, gloves, eye protection, and safe handling of sharps. They replace the older category of universal precautions.

Patient's voluntary agreement to treatment after receiving information about diagnosis, options, risks, benefits, and consequences of refusal. It must be documented and obtained from a competent patient or lawful representative.

The upper limit of local anesthetic calculated from the patient's body weight and the drug's maximum recommended dose per kilogram. It prevents systemic toxicity, especially in children and medically compromised patients.

Agent such as epinephrine added to local anesthetic to constrict vessels, slow absorption, prolong anesthesia, and reduce bleeding. It requires caution in patients with significant cardiovascular disease.

Persistent altered sensation such as numbness or tingling after nerve injury, sometimes following injection or surgery. Most cases resolve, but documentation and follow-up are essential.

Measurement of skull and facial landmarks on a standardized lateral head radiograph to assess skeletal and dental relationships. It guides orthodontic diagnosis, growth assessment, and treatment planning.

Stage of a child's bone development used to judge remaining facial growth. It is estimated from hand-wrist radiographs or cervical vertebral shape and influences the timing of orthodontic intervention.

Structured evaluation of factors that predict future caries, including diet, fluoride exposure, saliva, plaque, and past lesions. It determines recall interval and preventive measures such as sealants and fluoride varnish.

High-concentration topical fluoride applied to teeth as a preventive agent. It reduces demineralization and promotes remineralization and is recommended for children at elevated caries risk.

Epithelial-lined cavity arising from tooth-forming tissues, such as a radicular or dentigerous cyst. It is usually asymptomatic, appears as a well-defined radiolucency, and is treated by enucleation or marsupialization.

Malignant tumor of oral epithelium, the most common oral cancer, often on the lateral tongue or floor of mouth. Risk factors include tobacco, alcohol, and areca nut; early biopsy improves survival.

A predominantly white patch of oral mucosa that cannot be characterized clinically or pathologically as any other disease. It is a diagnosis of exclusion with malignant potential, so biopsy is often indicated.

Exposed jaw bone persisting beyond eight weeks in a patient treated with antiresorptive or antiangiogenic drugs, with no history of radiotherapy. Prevention includes avoiding elective extractions when possible.