Dental caries

Question 1

Ideal radiographs for interproximal caries

Answer 1

Bitewing

X-ray beam passes perpendicular to tooth surface and image is less distorted

Question 2

Early proximal caries radiographically

Answer 2

Triangle

Question 3

Proximal caries at DEJ

Answer 3

Triangle shape enlarges w/ apex toward pulp

Question 4

Demineralisation should be ……………. to be seem on xray

Answer 4

30-40%

Question 5

Reasons for false interpretations of caries on xrays

Answer 5

• Cervical burnout
• Hypoplasia
• Abraison due to clasp of partial denture
• Pits and fissures

Question 6

Percentage of carious lesions in dentine that are cavitated

Answer 6

50%

Must take into account, age, diet, patients motivation, location of lesion to come to conclusion on required treatment

Question 7

Occlusal caries radiographic appearance

Answer 7

• Broad base, bowl shape

Clinically- white chalky, yellowish or brownish appeaance

Question 8

Occlusal caries can be obscured by

Answer 8

Superimposition of buccal and lingual surfaces

Clinical inspection important- if radiolucent line along DEJ then obturation

Question 9

Caries lesions on buccal and lingual surfaces radiographically

Answer 9

• Round shape

• Difficult to determine which side so clinical observation key

Question 10

Factors that can be mistaken for secondary caries

Answer 10

• Different restorative materials
• Older composites

Differences in atomic number
Older composites more radiolucent

Question 11

Radiation caries radiographically

Answer 11

• Neck of teeth