ADEX Dental Hygiene Radiographic Interpretation Questions and Answers — Questions and Answers
Question 1: A periapical radiograph of the mandibular molar region reveals a well-defined radiopacity around the apex of tooth #30, which has a large carious lesion. The radiopaque area has diffuse, ill-defined borders blending into the surrounding bone. There is evidence of a widened periodontal ligament space. What is the most likely radiographic diagnosis?
- Idiopathic Osteosclerosis
- Hypercementosis
- Condensing Osteitis (Correct answer)
- Periapical Cemento-osseous Dysplasia (mature stage)
Correct answer: Condensing Osteitis
Condensing osteitis is a localized, reactive lesion characterized by bone sclerosis around the apex of a tooth with pulpal inflammation or necrosis. [24] Radiographically, it appears as a diffuse, non-expansile radiopacity associated with the apex of a non-vital or chronically inflamed tooth. [22, 27] The presence of a large carious lesion and a widened PDL space are key indicators pointing to this diagnosis. [24] Idiopathic osteosclerosis is not associated with an inflammatory stimulus. [6] Hypercementosis is excess cementum on the root and retains an intact lamina dura. [21] Mature periapical cemento-osseous dysplasia is typically surrounded by a radiolucent halo. [25]
Question 2: A hygienist is evaluating a set of bitewing radiographs and notices a distinct, unexposed area with a sharp, curved border on the mesial aspect of the image. The rest of the radiograph has adequate density and contrast. Which type of error most likely caused this artifact?
- Elongation
- Cone Cut (Correct answer)
- Film Bending
- Overlapping
Correct answer: Cone Cut
A cone cut occurs when the primary x-ray beam is not centered on the receptor, resulting in an unexposed area on the radiograph. [5, 16] The shape of the unexposed area (curved or straight) corresponds to the shape of the position-indicating device (PID). [5] Elongation is a distortion error caused by insufficient vertical angulation. Overlapping is caused by incorrect horizontal angulation. Film bending results in a distorted or stretched image. [11]
Question 3: On a periapical radiograph, you observe a thickening and blunting of the root of tooth #19. The enlarged root is surrounded by a continuous, visible periodontal ligament space and an intact lamina dura. The patient is asymptomatic. These findings are most characteristic of which condition?
- Cementoblastoma
- Condensing Osteitis
- Hypercementosis (Correct answer)
- Periapical Abscess
Correct answer: Hypercementosis
Hypercementosis is the non-neoplastic deposition of excessive cementum on the tooth root. [9] Radiographically, it is characterized by an enlarged or blunted root, but the key diagnostic feature is the presence of an intact and continuous periodontal ligament space and lamina dura surrounding the altered root structure. [4, 21] A cementoblastoma is a true tumor that often obliterates the PDL space and may cause pain or expansion. [9] Condensing osteitis is a reaction to inflammation, and a periapical abscess is a radiolucent lesion.
Question 4: A patient's radiograph shows a diffuse, triangular or wedge-shaped radiolucency at the cervical aspect of several anterior teeth, located just apical to the cementoenamel junction (CEJ). The enamel cap appears intact. What is the most probable interpretation of this finding?
- Root Caries
- Radiation Caries
- Abrasion
- Cervical Burnout (Correct answer)
Correct answer: Cervical Burnout
Cervical burnout is a radiolucent artifact caused by the anatomical indentation of the tooth at the cervical line, which results in less x-ray absorption. [18] It typically appears as a diffuse or wedge-shaped radiolucency on the mesial or distal surfaces of the root, just below the CEJ. [23] It is an optical illusion and not a pathological condition. Root caries, in contrast, tends to be more saucer-shaped or cavitated and does not have the characteristic location and shape of burnout. [10]
Question 5: A panoramic radiograph of a 45-year-old female patient shows multiple, well-defined, mixed-density lesions with radiolucent rims located in the periapical regions of the vital mandibular anterior teeth. The patient is asymptomatic. Which of the following is the most likely diagnosis?
- Florid Cemento-osseous Dysplasia
- Periapical Cemento-osseous Dysplasia (Correct answer)
- Chronic Periapical Abscesses
- Paget's Disease of Bone
Correct answer: Periapical Cemento-osseous Dysplasia
Periapical Cemento-osseous Dysplasia (PCOD) is a benign, reactive fibro-osseous lesion that typically presents in middle-aged females and has a strong predilection for the periapical region of the mandibular anterior teeth. [29] The associated teeth are vital. Radiographically, PCOD progresses through three stages: radiolucent, mixed-density, and finally a mature radiopaque stage, often with a surrounding radiolucent halo. [15, 28] The description matches the intermediate or mixed stage of PCOD.
Question 6: Which of the following radiographic findings is a classic sign of occlusal trauma?
- Horizontal bone loss
- Thickening of the lamina dura and widening of the PDL space (Correct answer)
- Loss of the lamina dura at the apex
- A well-defined periapical radiolucency
Correct answer: Thickening of the lamina dura and widening of the PDL space
The periodontium responds to excessive occlusal forces with specific changes. Radiographically, these changes often manifest as a widening of the periodontal ligament (PDL) space and a thickening of the lamina dura (the dense bone lining the socket). [2, 14] These signs indicate that the supportive structures are being stressed. While vertical bone loss can be associated with occlusal trauma, horizontal bone loss is more characteristic of periodontitis. [13] Loss of the lamina dura and a periapical radiolucency are signs of pulpal necrosis and subsequent infection.
ADEX Dental Hygiene Radiographic Interpretation Questions and Answers
A periapical radiograph of the mandibular molar region reveals a well-defined radiopacity around the apex of tooth #30, which has a large carious lesion.
The radiopaque area has diffuse, ill-defined borders blending into the surrounding bone.
There is evidence of a widened periodontal ligament space.
What is the most likely radiographic diagnosis?