DBT-BET key terms

An accessory cusp or ridge on the palatal surface of the mesiolingual cusp of a maxillary permanent molar, most common on first molars, and a useful landmark for identifying tooth type and arch side.

The boundary surface where enamel meets dentin in the crown of a tooth; its scalloped shape affects how preparation margins and caries lesions behave.

The line where the crown's enamel ends and the root's cementum begins. Its relationship to the gingival margin and attachment determines whether recession exposes cementum.

The portion of a posterior tooth's chewing surface bordered by cusp tips and marginal ridges, where food is crushed; its width and anatomy guide occlusal restoration design.

One of three rounded enamel projections on the incisal edge of a newly erupted anterior tooth, which wear away with function and help estimate a patient's age or eruption status.

A microscopic crystalline unit running from the DEJ toward the tooth surface. Rod direction determines how enamel is cut and etched and where bevels are placed.

The tooth contact pattern achieved when the jaw is closed in maximum intercuspation; it may or may not coincide with centric relation and is recorded during occlusal analysis.

A reproducible maxillomandibular relationship in which the condyles sit in their most anterior-superior position against the articular eminences, independent of tooth contact.

The combined dimension of junctional epithelium and connective tissue attachment above the alveolar crest, typically about 2 mm; violating it during margin placement can cause chronic inflammation.

The prepared terminal edge of a tooth preparation to which a restoration margin is adapted; its shape (chamfer, shoulder, knife-edge) affects fit, strength, and esthetics.

A thin layer of material applied to a gypsum die before waxing or scanning, compensating for cement film thickness so the finished restoration seats fully.

How closely a restoration's edge fits the prepared tooth margin; poor adaptation permits microleakage, cement washout, and recurrent caries.

The passage of bacteria, fluids, or ions through a microscopic gap between a restoration and tooth structure, a common cause of postoperative sensitivity and secondary caries.

Volume reduction that occurs as resin monomer converts to polymer during curing; it generates contraction stress at bonded interfaces and can open marginal gaps or debond cusps.

Placing and light-curing resin composite in small increments rather than one bulk layer, reducing shrinkage stress and improving depth of conversion in deep cavities.

The thickness of resin composite that receives enough light energy to reach adequate conversion; it depends on shade, opacity, filler loading, and light intensity.

Light power delivered per unit area, expressed in milliwatts per square centimeter; it is a key output check for curing lights and directly influences achievable depth of cure.

A device that measures the irradiance output of a dental curing light, used to verify the unit still delivers adequate energy before bonding or composite procedures.

Applying phosphoric acid gel to enamel or dentin to dissolve mineral and create microporosity, allowing resin tags to form and bond micromechanically to tooth structure.

The interdiffusion zone where adhesive resin penetrates demineralized dentin around exposed collagen fibers; its quality strongly influences dentin bond durability.

The fractional change in length or volume of a material per degree of temperature change; mismatches between restorative material and tooth can stress margins under hot and cold foods.

Electrical current generated when two dissimilar metals contact each other in saliva, causing accelerated corrosion of the less noble metal and sometimes a sharp metallic taste.

A metal such as gold, platinum, or palladium that resists oxidation and corrosion; high-noble alloys are favored for cast restorations where chemical stability matters.

A casting alloy based on nickel, chromium, cobalt, or titanium rather than precious metals; cheaper and stiffer but harder to solder and less corrosion resistant.

A wax replica of the planned casting built on a die; its contour, thickness, and margins determine the fit and strength of the final cast restoration.

A refractory gypsum- or phosphate-bonded material that encases a wax pattern and expands on setting and heating to compensate for metal casting shrinkage.

The metal cylinder that holds investment around a wax pattern during burnout and centrifugal or vacuum casting; its size and liner placement control expansion.

A rigid resin or shellac record base adapted to a master cast, used to carry wax occlusion rims or trial tooth arrangements during denture fabrication.

A wax block built on a baseplate to represent the occlusal plane and vertical dimension; it is adjusted to record jaw relations and transfer them to an articulator.

The facial height measured with teeth or occlusion rims in contact; it guides denture tooth setup and must be restored within the patient's comfort range.

The gap between the occlusal surfaces of maxillary and mandibular teeth when the mandible is in its resting posture, usually 2 to 4 mm.

Retention resists denture displacement along the path of insertion, while stability resists rotational and horizontal forces; both depend on border seal, fit, and occlusion.

Shaping the denture border with modeling compound or elastomer so it records the functional width of the vestibule, producing an optimal peripheral seal.

A complete denture arrangement in which contacts occur bilaterally and simultaneously in excursions, minimizing tipping forces and improving denture stability.

Resistance to unwanted tooth movement during orthodontic force application, provided by other teeth, the palate, extraoral structures, or temporary skeletal devices.

A small titanium screw or plate placed in bone to provide absolute anchorage for orthodontic tooth movement without relying on patient compliance.

Attaching orthodontic brackets to enamel with adhesive after acid etching; moisture control and accurate bracket placement are essential for bond survival and efficient tooth movement.

A line drawing of skull landmarks made from a standardized lateral head radiograph, used to measure skeletal and dental relationships for diagnosis and treatment planning.

A low-dose imaging method producing three-dimensional volumes of the jaws and teeth; used for implant planning, root canal anatomy, airway, and impacted tooth localization.

Capturing the dentition or arch with an intraoral scanner instead of elastomeric material, producing a mesh file for CAD design or model printing.

A file format that describes an object's surface as a mesh of triangles; widely used to exchange scan data between scanners, design software, and printers or mills.

A subtractive manufacturing machine that carves a restoration from a solid block or blank under software control, using burs and coolant to achieve fine margins.

Heating a milled or pressed ceramic restoration to fuse particles and achieve final density and strength; zirconia usually requires this step before glazing and seating.

The small gap designed in CAD software between a restoration's intaglio and the die, allowing cement to escape and the restoration to seat fully.

A validated process that destroys all microbial life, including bacterial spores; in dentistry it is typically achieved by steam autoclave under monitored cycles.

A system that categorizes instruments and items as critical, semicritical, or noncritical according to infection risk, guiding whether sterilization or disinfection is required.

A test strip or vial containing resistant bacterial spores used inside sterilization loads to verify that the cycle actually achieved sterilization conditions.

A pressure vessel that sterilizes instruments with saturated steam under pressure; routine monitoring includes temperature, pressure, and cycle records.

A chemical process that destroys all microorganisms except high numbers of bacterial spores, used for heat-sensitive semicritical items such as some impression trays or endoscopes.

A standardized document listing a chemical's hazards, handling precautions, first-aid measures, and disposal requirements, which must be accessible where the product is used.

The regulatory requirement to label hazardous chemicals and train workers about their risks, typically through labels, safety data sheets, and written programs.

A written program describing how a workplace protects staff from bloodborne pathogens, including vaccination, protective equipment, and post-exposure procedures.

Barrier items such as gloves, masks, eye protection, and gowns worn to prevent contact with blood, saliva, and airborne particles during clinical and laboratory work.

A patient's voluntary agreement to treatment after receiving understandable information about diagnosis, options, risks, benefits, and alternatives, documented in the record.

The level of care a reasonably competent practitioner in similar circumstances would provide; it is the benchmark used to judge negligence claims.

The procedures and responsibilities a dental professional is legally permitted to perform under their license, registration, or supervision level.

Assigning a task to another team member, such as a dental assistant or technician, which is lawful only if the task falls within that person's permitted scope and supervision.

The legal documentation of a patient's history, findings, treatment, and communications; it must be accurate, contemporaneous, and retained per local requirements.