Moderate Interproximal Caries

Question 1

criteria for matrix placement

Answer 1

replace the missing cavity wall proximally
must form contact with the adjacent tooth
must be adapted to the gingival cavosurface margin
risk of open contacts and gingival overhang

Question 2

criteria for incremental build up

Answer 2

recreate the missing external axial walls
incremental build using as few layers as possible
each increment touching as few surfaces as possible
occlusal and proximal relations checked on dam removal

Question 3

why to avoid overmanipulating the composite

Answer 3

this will incorporate air into it which affects the set of the material but also makes it look opaque.

Question 4

should the occlusal check and polishing be done before removing the dam

Answer 4

no after

Question 5

which caries must always be removed

Answer 5

soft dentine - pulp exposure should not be avoided if it means leaving behind soft caries

Question 6

which material is used for indirect pulp capping

Answer 6

resin modified glass ionomer

Question 7

which material is used for direct pulp capping

Answer 7

setting calcium hydroxide to promote bridge formation

Question 8

if the pulp continues to bleed after drying what does this indicate

Answer 8

irreversible pulpitis

Question 9

what should you do to dentine after placing pulp cap and lining

Answer 9

rehydration

Question 10

basic step to pulp capping

Answer 10

setting calcium hydroxide over the pulp exposure
resin modified glass ionomer over this

Question 11

what are the steps to placing composite increments

Answer 11

• sectional matrix and wedge in place
• enamel etch
• dentine and enamel etch
• wash and remove excess moisture
• bond placement and cure
• flowable composite placement and cure
• occlusal floor only composite increment, cure
• mesio lingual placement to the midpoint of contact
• mesio buccal wall, midpoint of contact, cure
• remove the matrix to check the gingival floor and contact point
• disto buccal occlusal increment placed and cured
• mesio buccal occlusal increment placed and cured
• disto lingual occlusal increment placed and cured
• mesio lingual occlusal increment placed and cured
• marginal finish and occlusion checked
• final polish and surface seal and cure
• completed restoration

Question 12

how can you determine if the carious lesion is arrested

Answer 12

colour - arrested lesions are brownish black, active lesions are yellowish
texture - active lesions are rough
location - away from gingival margins when arrested
shine - arrested lesions are shiny or glossy, while active lesions are opaque

arrested lesions are non cavitated and not associated with plaque
no gingival bleeding on probing

Question 13

what are resin sealants

Answer 13

these form a protective layer that keeps food and bacteria from getting stuck in the pits and fissures.

thin, plastic coatings that dentists apply to the chewing surfaces of teeth to prevent cavities

Question 14

describe enamel bonding agents

Answer 14

usually bisgma

Question 15

what are line angles

Answer 15

the area where one surface transitions to another

Question 16

what is the modulus of elasticity

Answer 16

material’s resistance to non-permanent deformation when a force is applied

Question 17

steps to cavity preparation for moderate interproximal caries

Answer 17

• identify and remove carious enamel
• remove enamel to identify the maximal extent of the lesion at the ameldodentinal junction and smooth the enamel margins
• progressively remove peripheral caries in dentine from the adj first then circumferentially deeper
• only then remove deep caries over the pulp
• outline form modification, enamel finishing, occlusal and the requirements of the restorative material
• internal design modification, internal line and point angles, requirements of the restorative material