liner and bases Flashcards
Why do we need to protect the pulp?
(1 ) heat generated by rotary instruments
(2) some ingredients of various materials
(3) thermal changes conducted through restorative materials
(4) forces transmitted through materials to the dentin
(5) galvanic shock
(6) the ingress of noxious products and bacteria through microleakage.
thin film which provide a protective coating to freshly cut tooth structure of the prepared cavity
Cavity sealers
if we need to coat all walls of the cavity we use?
cavity sealer
Types of sealers
- Varnish
- Adhesive sealers
- Gluma
Physical adhesion to tooth structure is a property of?
varnish
Provide sealing as well as bonding at the interface between restorations (amalgam or composite) and cavity preparation walls.
Adhesive Sealers
Used as a desenstizing agent
Gluma
Could be used on non-cavitied sensitive areas or the
tooth (root surface, non-carious lesions)
Gluma
thin barrier (0.5 mm) that protects the pulpal tissue and provide some type of therapeutic benefit (medicament).
Cavity Liners
applied only to dentin
cavity liners
Calcium hydroxide liners (Dycal) must always be covered with an RMGI in amalgam, why?
it is desirable to have approximately a 2-mm dimension of bulk between the pulp and a metallic restorative material.
Calcium hydroxide liners (Dycal) must always be covered with an RMGI in composite, why?
to protect the liner from dissolution from the etchant used for the composite placement
Cavity Bases
Dental bases are used to replace missing dentinal tooth structure. Bases should have adequate strength and modulus of elasticity to support the overlying restoration.
insulation is a purpose of
cavity bases
can be used as liner or base?
Zinc oxid eugonol
Glass ionomer
