Intro to Cavity Preps Flashcards
All cavity preps begin with:
ideal conservative prep
how is clinical judgement developed?
foundation in knowledge combined with clinical experience
Enamel is brittle, meaning: it has a high _____ and ow _____
elastic modulus, low tensile strength
what is the most important quaity of dentin?
compressive, does not fracture under occlusal forces
why does amalgam require undercuts for retention?
because it does not really bond to dentin, undercuts help it to stay in place
what is the Cavo surface angle for amalgam?
90*
what is the cavosurface angle for composite?
butt joint (90*) or beveled (angled)
what are the principals of the initial stages of cavity prep?
outline form and initial depth
primary resistance form
primary retention form
convivence form
decay at the internal wall is removed ____
last
ceramic require a depth of ___
2mm or more
what is primary resistance form?
cavity features that prevent fracture of the tooth and or restorative material
what kind of retention form is used for amalgam?
mechanical
what kind of retention form is used for composite?
mechanical and micromechanical etch (acid etch makes micro pores for
what is a convivence form?
cavity features that provide adequate observation, accessibility and ease of operation
What should you think about when it comes to location of decay being at the DEJ?
decay spreads at the DEJ, cavosurface margins and lateral walls must be caries free, last remove decay from pupal and axial walls
what is important to understand about staining?
not all staining is caries
what is the acceptable dentin texture vs unacceptable?
dry and Leathery is good
soft and moist is bad
what is the difference between a base and liner?
bases thermal protection from metal restorations
liners- material protection for pulp from the composite
what can you use for secondary resistance macromechanical?
grooves, slots, boxes, pins
bevel placement
grooves and locks are in a _____ plane
longitudinal plane
a slot is placed in the ____ plane
transverse/horizontal
class V amalgam requires ____ for proper retention
secondary groove
class V composite extending below CEJ requires ____, ___ in enamel provides secondary retention
secondary groove placement
beveling in enamel
ceramic requires ____ joints
butt (same with amalgam)
why do you never desiccate a preparation?
(means drying excessive)
collapses collagen matric and damages pulp by harming odontoblasts
steps for final procedure:
remove a unsupported enamel
use varnish or bonding agent under amalgam
acid etch for composite bonding (strength and limit microleakage)
