Radiographic Interpretation: Teeth, Restorations, Dental Caries, and Periodontal Disease

Comprehensive vocabulary flashcards covering dental radiographic interpretation, restorative materials, caries classification, periodontal structures, dental trauma, and pulpal/periapical conditions.

Radiographic Interpretation

An explanation of what is viewed on a dental radiograph and the ability to read what is revealed.

Diagnosis

The identification of a disease through examination or analysis, which is the sole legal responsibility of the dentist.

Radiolucent

The portion of a dental image that appears black or dark because the underlying structures lack density and permit the passage of the x-ray beam.

Radiopaque

The portion of a dental image that appears white or light because the underlying structures are dense and absorb or resist the passage of the x-ray beam.

Amalgam Restorations

Metallic restorations ("silver fillings") that appear completely radiopaque on dental images with irregular or uneven margins.

Amalgam Overhang

A poorly contoured restorative extension that projects beyond the crown margin and fails to remain flush with the tooth surface.

Amalgam Tattoo

A permanent blue-black or grey iatrogenic mucosal pigmentation caused by amalgam fragments embedded in soft tissue during restoration placement, removal, or tooth extraction.

Gold Restorations

Metallic restorations (such as crowns and onlays) that appear completely radiopaque, identical in density to amalgam, but are distinguished by smooth, well-defined contours and margins.

Stainless Steel Crown

A prefabricated interim or temporary crown that appears thin, poorly contoured, and radiographically "see-through."

Bridge

A fixed prosthetic replacement consisting of two primary components: one or more abutment retainers and one or more suspended pontics.

Abutment

A natural anchor tooth fitted with a crown that supports and retains a fixed partial denture (bridge).

Pontic

The suspended artificial prosthetic tooth that replaces a missing tooth within a bridge.

Porcelain-Fused-to-Metal (PFM) Crown

A crown featuring two distinct radiographic zones: a completely radiopaque metal core and a slightly radiopaque porcelain outer layer.

Post and Core

A foundation restoration placed in endodontically treated teeth, where the core replaces coronal tooth structure and the cast or prefabricated post extends into the prepared root canal.

All-Porcelain Crown

A nonmetallic restoration that appears slightly radiopaque, outlined along the prepared tooth margin by a thin radiopaque line of luting cement.

Composite Restorations

Nonmetallic direct restorative materials containing manufactured radiopaque filler particles to allow radiographic differentiation from radiolucent caries.

Acrylic Resins

The least dense nonmetallic restorative material, appearing radiolucent or barely visible on radiographs and typically presenting as rounded restorations that can be mistaken for caries.

Base Material

Protective cavity liners (such as zinc phosphate cement or zinc oxide-eugenol) placed on the cavity floor beneath restorations to insulate the pulp, appearing less radiodense than amalgam.

Metallic Retention Pin

A cylindrical metallic pin placed in dentin to mechanically enhance the retention of large amalgam or composite restorations.

Gutta Percha

A clay-like, radiopaque endodontic material with a radiodensity similar to base materials, utilized to fill and obturate root canal spaces.

Silver Points

A historically used metallic endodontic obturation material that appears markedly more radiodense than gutta percha.

Diatorics

Tiny radiopaque retention features found on anterior porcelain denture teeth that mechanically lock the teeth into the acrylic denture base.

Dental Caries

The demineralization and progressive breakdown of hard tooth structures resulting in local loss of density, which appears radiolucent on dental radiographs.

Incipient Interproximal Caries

An early proximal carious lesion that extends less than halfway through the enamel and assumes a triangular configuration with its apex pointing toward the DEJ.

Moderate Interproximal Caries

A proximal carious lesion extending more than halfway through the enamel but not yet involving the dentino-enamel junction (DEJ).

Advanced Interproximal Caries

A proximal carious lesion that extends to and through the DEJ into dentin, but does not penetrate more than halfway through dentin toward the pulp.

Severe Interproximal Caries

An extensive proximal carious lesion extending through enamel and dentin more than halfway toward the pulp chamber.

Incipient Occlusal Caries

Early occlusal decay confined to enamel that cannot be detected on radiographs due to cusp superimposition and must be diagnosed clinically using an explorer.

Moderate Occlusal Caries

An occlusal carious lesion that has penetrated into dentin and becomes visible as a radiolucency under the occlusal surface on a dental image.

Severe Occlusal Caries

Extensive occlusal decay presenting as a large, well-defined radiolucency extending deeply into the dentin, easily visualized on radiographs.

Buccal and Lingual Caries

Carious lesions appearing as small, circular radiolucencies that are difficult to evaluate radiographically due to superimposition, necessitating clinical explorer confirmation.

Root Surface Caries

Saucer-shaped radiolucencies located just below the cervical line that involve no enamel and are invariably preceded by alveolar bone loss and gingival recession.

Recurrent Caries

Secondary carious lesions occurring adjacent to an existing restoration as a result of defective margins, inadequate prep design, incomplete caries removal, or plaque retention.

Rampant Dental Caries

Advanced and rapidly progressing carious destruction involving numerous teeth simultaneously, typically occurring in children with poor dietary habits or adults with reduced salivary flow.

Lamina Dura

A dense, unbroken radiopaque line of cortical bone that lines the tooth socket and outlines the roots of teeth in a healthy periodontium.

Alveolar Crest

The most coronal portion of the alveolar bone, located $1.5\text{--}2.0\,\text{mm}$ below the cementoenamel junction (pointed and radiopaque in anteriors; flat and less radiopaque in posteriors).

Periodontal Ligament Space

A thin, continuous radiolucent line of uniform thickness located between the outer root surface and the lamina dura.

Horizontal Bone Loss

A radiographic pattern of alveolar bone loss where the remaining bone crest lies parallel to an imaginary line connecting the CEJs of adjacent teeth.

Vertical Bone Loss

An angular radiographic pattern of bone resorption where the crest of the bone does not lie parallel to the imaginary line connecting the CEJs of adjacent teeth.

Calculus

Mineralized bacterial plaque that appears radiographically as sharp, pointed, or ring-like radiopaque projections extending from proximal root and crown surfaces.

Luxation

The abnormal traumatic displacement of a tooth, classified as either intrusion (into the bone) or extrusion (partial avulsion out of the bone).

Avulsion

The complete traumatic displacement and loss of a tooth from the alveolar socket.

Physiologic Resorption

The normal, natural resorption of primary tooth roots accompanying the shedding process during mixed dentition transition.

External Resorption

A pathologic loss of root structure along the root periphery (often resulting in blunted apices) caused by mechanical forces, reimplantation, trauma, chronic inflammation, or cysts.

Internal Resorption

Pathologic resorption occurring within the pulp chamber, canals, and surrounding dentin, appearing as a round-to-ovoid radiolucency in the middle crown or root.

Pulpal Sclerosis

A diffuse calcification within the pulp chamber and canals associated with normal aging that produces a generalized reduction in pulp cavity size.

Pulp Canal Obliteration

The complete calcific closure and nonvital disappearance of the radiographic pulp chamber and canals induced by chronic irritants such as trauma, attrition, abrasion, or caries.

Pulp Stones

Discrete, asymptomatic, round, ovoid, or cylindrical radiopaque calcifications situated within the pulp chamber or root canals.

Cervical Burnout

An optical illusion appearing as a wedge-shaped radiolucency at the tooth neck, produced by density differences between dense enamel/bone and less dense cervical dentin.