Chapter 24 Flashcards
What is moderate caries seen radiographically?
Moderate caries is seen as a radiolucency that has penetrated over halfway through the enamel but did not reach the DEJ.
What is severe caries seen radiographically?
Severe caries is seen as a radiolucency that has penetrated over halfway through the dentin toward the pulp.
Where should you examine for evidence of proximal caries?
Examine at and just apical to the contact point of adjacent teeth.
As a carious lesion progresses, what shape does it take?
It takes on a triangular shape with the apex pointing toward the DEJ and the base toward the outer surface of the tooth.
Which type of caries is least likely to be imaged on a radiograph?
Incipient occlusal caries.
Which conditions resemble caries on a radiograph?
Nonmetallic restorations, cervical burnout, and Mach band effect.
Are early occlusal, buccal, lingual, and cemental caries likely to be recorded on radiographs?
TRUE
Do proximal caries occur on the buccal and lingual surfaces of the teeth?
FALSE
Do occlusal caries occur on the smooth surfaces of the posterior teeth?
FALSE
What is the Mach band effect?
An optical illusion caused by the overlapping of teeth that mimics decay.
Are buccal and lingual caries best detected radiographically?
FALSE
Can the depth of buccal or lingual caries be determined by observing radiographs?
FALSE
Where does root caries develop?
Between the enamel border and free gingival margin on the cemental surface of the tooth.
What does recurrent caries appear as on a radiograph?
A radiolucency adjacent to the restoration.
Can nonmetallic radiolucent restorations mimic decay radiographically?
TRUE
What is arrested caries?
Caries that are no longer active.
What is caries?
A disease of the calcified tissues of the teeth.
What is the required decrease in calcium and phosphorus for caries to be recorded on a radiograph?
Approximately 40 to 50 percent.
What is the term for severe, unchecked caries affecting multiple teeth?
Rampant caries.
How do caries appear radiographically compared to radiopaque enamel?
Radiolucent.
How are caries differentiated from nonmetallic radiolucent restorations?
Caries usually have more diffuse borders and an uneven triangular radiolucency.
What is the most extensive class of proximal decay according to the grading system?
C-4, or severe caries.
What is the radiographic appearance of moderate occlusal decay at the DEJ?
A thin, flat, radiolucent line.
