Principles of Caries Removal & Cavity Prep

Question 1

what determines cavity design?

Answer 1

• the structure and properties of the dental tissues
• the disease involved
• the properties of restorative materials

Question 2

where can caries be located?

Answer 2

• smooth surfaces
• pit and fissures
• approximal areas
• roots

Question 3

smooth surface caries can be a result of?

Answer 3

• plaque build up (caries)

- erosion

Question 4

what factors must be considered throughout the cavity design process?

Answer 4

• the position of the caries
• the extent of the caries
• the shape of the prepared cavity
• the final restorative material

Question 5

what are principles of preparation driven by?

Answer 5

• caries removal

- necessary finishing

Question 6

what is the first step of cavity prep?

Answer 6

identify and remove carious enamel

Question 7

what is the second step of cavity prep?

Answer 7

remove enamel to identify the maximal extent of the lesion at the ADJ and smooth the enamel margins

Question 8

what is the third step of cavity prep?

Answer 8

progressive remove peripheral caries in dentine from ADJ first then deeper

Question 9

what is the fourth step of cavity prep?

Answer 9

only then remove deep caries over pulp

Question 10

what is meant by outline form modifications?

Answer 10

• enamel finishing
• occlusion
• requirements for restorative material

Question 11

what is meant by internal design modifications?

Answer 11

• internal line and point angles

- requirements of restorative materials

Question 12

what must be removed to avoid polymerisation fracture?

Answer 12

unsupported enamel

Question 13

what is meant by CSMA?

Answer 13

cavo surface margin angle

Question 14

what is the CSMA?

Answer 14

the angel at which the outside of the tooth meets the inside of the cavity

Question 15

when should caries on the pulpal floor be removed?

Answer 15

last!

Question 16

what burrs should be used to remove caries on the pulpal floor?

Answer 16

• large round burr
• large hand held excavator
• chemo-mechanical caries removal

Question 17

what are small burrs and excavators unsuitable for removing pulpal caries?

Answer 17

they will cut deeply more quickly & risk pulpal exposure

Question 18

what are the advantages of composite?

Answer 18

• aesthetics
• conservation of tooth tissue
• command cure
• low thermal conductivity
• adhesion/bonding

Question 19

do you have to remove ALL of the caries?

Answer 19

not always (some deep caries can be sealed in)

Question 20

how is the airway and pulp protected?

Answer 20

dental dam