ADEX Dental key terms

The thin, highly mineralized outer layer covering the tooth crown. It contains about 96 percent mineral by weight, has no living cells, and cannot repair itself after acid or wear destroys it.

Soft connective tissue inside the tooth chamber and root canals. It carries blood vessels and nerves, forms dentin throughout life, and mounts inflammatory responses that can produce pain.

Fibrous tissue between the tooth root and alveolar bone. Its collagen bundles suspend the tooth, absorb chewing forces, and allow small tooth movements during orthodontic treatment.

A structured community of bacteria attached to tooth or restoration surfaces and embedded in a polysaccharide matrix. Plaque biofilm drives caries and periodontal disease and resists simple rinsing.

The time needed for the blood concentration of a drug to fall by half. It guides dosing intervals and predicts how quickly an effect wears off or a drug clears before surgery.

Three-dimensional x-ray imaging that rotates around the head and reconstructs volumetric data. It shows bone, teeth, and canals at lower radiation dose than medical CT, though soft tissue contrast is poor.

A radiation protection principle meaning doses should be kept as low as reasonably achievable. In dentistry it drives the choice of the least exposing image, tight collimation, and avoiding repeat exposures.

A ranked list of possible conditions that could explain a patient's signs and symptoms. Clinicians build it from history, examination, and imaging, then narrow it with tests before choosing treatment.

A microscopic zone created when resin infiltrates etched, demineralized dentin and polymerizes around collagen fibers. It is the main bonding mechanism of modern adhesive restorations and depends on moisture control.

A thin strip or ring placed around a prepared tooth to replace a missing wall. It confines restorative material during placement, helps restore proximal contour and contact, and is removed before final finishing.

The distance from a coronal reference point to the apical limit where canal preparation and filling should stop. Accurate determination prevents short obturation or damage to periapical tissues.

The most widely used endodontic irrigant. It dissolves necrotic tissue, kills microorganisms, and lubricates the canal, but must be kept away from vital structures because it is cytotoxic.

A device that measures electrical impedance between a file inside the canal and the oral mucosa to estimate where the canal ends. It helps determine working length when the apex is not clearly visible radiographically.

The distance from the cementoenamel junction to the base of the periodontal pocket. It measures historical attachment loss and, unlike probing depth alone, is not distorted by gingival enlargement or recession.

The distance a periodontal probe penetrates from the gingival margin to the pocket base. Recorded at six sites per tooth, it describes current sulcular health but not past attachment loss.

The length of tooth crown compared with the length of root supported by bone. It estimates the biomechanical prognosis of a tooth and guides decisions about periodontal treatment, splinting, or extraction.

Direct structural and functional union between living bone and the surface of a titanium implant, without an intervening soft tissue layer. It is the biological basis for implant-supported crowns, bridges, and overdentures.

A circumferential band of sound tooth structure, ideally at least 1.5 to 2 millimeters, that encircles the crown preparation for a post-retained restoration and resists fracture forces.

An arrangement of complete denture teeth where contacts occur simultaneously on both sides in centric and remain stable during excursive movements, protecting the supporting tissues from tipping forces.

Exposed bone persisting more than eight weeks in a patient taking antiresorptive or antiangiogenic drugs, without radiation history or obvious metastasis. It requires cautious surgery and coordinated medical review.

A procedure that opens an abscess through a surgical cut so pus can escape and pressure is relieved. It is combined with removing the cause, such as the offending tooth or root canal treatment.

Limited ability to open the mouth, usually measured as interincisal distance below about 35 to 40 millimeters. Common causes include muscle spasm, infection, trauma, and post-surgical swelling after third molar removal.

A white patch or plaque of the oral mucosa that cannot be wiped off and cannot be classified clinically or pathologically as any other disease. It is a diagnosis of exclusion with malignant potential.

A chronic immune-mediated mucosal condition producing white lacy striae, often bilaterally on the buccal mucosa, sometimes with erosive red areas that cause soreness. It is managed, not cured, and needs periodic review.

An appliance that holds the arch space left by a prematurely lost primary tooth until the permanent successor erupts, preventing drifting, impaction, and crowding.

A sagittal relationship in which the lower first molar sits distal to the upper first molar by at least half a cusp width, often with an overjet and a retrusive mandible.

A concentrated fluoride coating painted onto tooth surfaces. It adheres to enamel, releases fluoride slowly, and is used to prevent caries and treat sensitivity in children and adults.

The upper limit of local anesthetic, usually expressed in milligrams per kilogram or as a total cartridge count, that may be given in one appointment without risking systemic toxicity.

A drug such as epinephrine added to local anesthetic to constrict blood vessels. It slows absorption, prolongs anesthesia, reduces bleeding, and lowers the risk of toxic overdose.

An injection depositing anesthetic near the mandibular foramen to numb the inferior alveolar nerve. It anesthetizes mandibular molars, premolars, and anterior teeth on one side plus the lower lip and chin.

Inhalation of a titrated mixture of nitrous oxide and oxygen to reduce anxiety while the patient stays awake and responsive. Effects reverse within minutes after oxygen administration, making it useful for short procedures.

The process of explaining a proposed treatment, its benefits, risks, alternatives, and the consequences of refusing, then obtaining the patient's voluntary agreement to proceed.

The degree of skill and judgment that a reasonably prudent clinician with similar training would provide in similar circumstances. It is the benchmark used to judge negligence in malpractice claims.

A law that sets the maximum time after an event or after discovery of injury within which a lawsuit must be filed. Missing it usually bars the claim permanently.

Infection control practices applied to every patient regardless of known diagnosis, including hand hygiene, gloves, masks, eye protection, and safe handling of sharps and body fluids.

A system that sorts instruments by the infection risk of the tissue they contact into critical, semicritical, and noncritical categories, each requiring a defined level of reprocessing from sterilization to simple cleaning.

A written workplace document describing how a practice protects staff from bloodborne pathogens, covering vaccination, protective equipment, work practice controls, housekeeping, and post-exposure follow-up.