Class III

Question 1

What is the definition of class III caries

Answer 1

caries that occurs on the proximal surfaces of anterior teeth; does not include the incisal edge

Question 2

What are the reasons for restoring class IIIs

Answer 2

primary caries (50%)
replacement of old restorations (50%)

Question 3

What causes the replacement of old class III restorations

Answer 3

recurrent caries

esthetics; discoloration of restoration, wear of restoration, fracture

Question 4

Where are class III caries most likely to be found

Answer 4

around and gingival to the contact area

Question 5

This is used to detect caries via decalcified enamel and dentin absorb light; teeth are translucent

Answer 5

transillumination

Question 6

What are two visual clues regarding class III caries

Answer 6

color - often darker

opacity - enamel undermined by caries often looks more opaque

Question 7

What are the two components of the clinical examination that are used to assess caries

Answer 7

visual assessment

tactile assessment; hardness is the best clinical indicator of carious dentin

Question 8

The undermined enamel may eventually fracture exposing what

Answer 8

carious dentin

Question 9

This can be used to supplement the clinical examination for class III caries

Answer 9

radiographs

Question 10

What two materials are used to class III restorations

Answer 10

composite resin; particularly when surrounded primarily by enamel
resin modified glass ionomer; particularly when lesion is surrounded by cementum and dentin, high caries risk individuals

Question 11

What is the restoration technique regarding class III caries

Answer 11

lingual approach;
most common
least visible from smile
located just below the contact area

Question 12

This is a type of class III preparation where the margins are all in enamel

Answer 12

beveled conventional

Question 13

This is a type of class III preparation where the preparation is dictated by the extent of caries; more conservatibe

Answer 13

modified

Question 14

With the conventional class III, what is the facial and axial depth of the preparation

Answer 14

facial depth; break facial contact minimally (1-1.5mm)

axial depth; .2-.5 into dentin (1mm lateral, 1.5mm central)

Question 15

What is the main different between a bevel conventional preparation and a conventional preparation

Answer 15

the bevel preparation is beveled 45°