Intro to Cavity Preps

Question 1

All cavity preps begin with:

Answer 1

ideal conservative prep

Question 2

how is clinical judgement developed?

Answer 2

foundation in knowledge combined with clinical experience

Question 3

Enamel is brittle, meaning: it has a high _____ and ow _____

Answer 3

elastic modulus, low tensile strength

Question 4

what is the most important quaity of dentin?

Answer 4

compressive, does not fracture under occlusal forces

Question 5

why does amalgam require undercuts for retention?

Answer 5

because it does not really bond to dentin, undercuts help it to stay in place

Question 6

what is the Cavo surface angle for amalgam?

Answer 6

90*

Question 7

what is the cavosurface angle for composite?

Answer 7

butt joint (90*) or beveled (angled)

Question 8

what are the principals of the initial stages of cavity prep?

Answer 8

outline form and initial depth
primary resistance form
primary retention form
convivence form

Question 9

decay at the internal wall is removed ____

Answer 9

last

Question 10

ceramic require a depth of ___

Answer 10

2mm or more

Question 11

what is primary resistance form?

Answer 11

cavity features that prevent fracture of the tooth and or restorative material

Question 12

what kind of retention form is used for amalgam?

Answer 12

mechanical

Question 13

what kind of retention form is used for composite?

Answer 13

mechanical and micromechanical etch (acid etch makes micro pores for

Question 14

what is a convivence form?

Answer 14

cavity features that provide adequate observation, accessibility and ease of operation

Question 15

What should you think about when it comes to location of decay being at the DEJ?

Answer 15

decay spreads at the DEJ, cavosurface margins and lateral walls must be caries free, last remove decay from pupal and axial walls

Question 16

what is important to understand about staining?

Answer 16

not all staining is caries

Question 17

what is the acceptable dentin texture vs unacceptable?

Answer 17

dry and Leathery is good
soft and moist is bad

Question 18

what is the difference between a base and liner?

Answer 18

bases thermal protection from metal restorations
liners- material protection for pulp from the composite

Question 19

what can you use for secondary resistance macromechanical?

Answer 19

grooves, slots, boxes, pins
bevel placement

Question 20

grooves and locks are in a _____ plane

Answer 20

longitudinal plane

Question 21

a slot is placed in the ____ plane

Answer 21

transverse/horizontal

Question 22

class V amalgam requires ____ for proper retention

Answer 22

secondary groove

Question 23

class V composite extending below CEJ requires ____, ___ in enamel provides secondary retention

Answer 23

secondary groove placement
beveling in enamel

Question 24

ceramic requires ____ joints

Answer 24

butt (same with amalgam)

Question 25

why do you never desiccate a preparation?

Answer 25

(means drying excessive) collapses collagen matric and damages pulp by harming odontoblasts

Question 26

steps for final procedure:

Answer 26

remove a unsupported enamel use varnish or bonding agent under amalgam acid etch for composite bonding (strength and limit microleakage)