The functions of cement bases are:
a. To act alike a barrier against acids or thermal shocks.
b. The minimal thickness, which is required, is 0.5 mm of base.
c. A and b.
d. None of the above. ***
e. 1 only.
f. 2 only
"Sturdevant's art and science of operative dentistry, 5th edition - page 174-175"
Liners and bases are materials placed between dentin (and sometimes pulp) and the restoration to provide pulpal protection or pulpal response .
Bases (cement bases, typically 1 to 2 mm) are used to provide thermal protection for the pulp and to supplement mechanical support for the restoration by distributing local stresses from the restoration across the underlying dentin surface. This mechanical support provides resistance against disruption of thin dentin over the pulp during amalgam condensation procedures or cementation procedures of indirect restorations.
Liners are relatively thin layers of material used primarily to provide a barrier to protect the dentin from residual reactants diffusing out of a restoration and/or oral fluids that may penetrate leaky tooth-restoration interfaces. They also contribute initial electrical insulation; generate some thermal protection and in some formulations provide pulpal treatment . the need for liners is greatest with pupally extended metallic restorations that are not well bonded to tooth structure and that are not insulating such as amalgam and cast gold or with other indirect restoration.
• Thin liners(1-50 mm) subdivided into solution liners(varnishes2-5 mm) and suspension liners (typically 20-25 mm).
• Thick liners(200-1000 mm= 0.2-1 mm).
a. To act alike a barrier against acids or thermal shocks.
b. The minimal thickness, which is required, is 0.5 mm of base.
c. A and b.
d. None of the above. ***
e. 1 only.
f. 2 only
"Sturdevant's art and science of operative dentistry, 5th edition - page 174-175"
Liners and bases are materials placed between dentin (and sometimes pulp) and the restoration to provide pulpal protection or pulpal response .
Bases (cement bases, typically 1 to 2 mm) are used to provide thermal protection for the pulp and to supplement mechanical support for the restoration by distributing local stresses from the restoration across the underlying dentin surface. This mechanical support provides resistance against disruption of thin dentin over the pulp during amalgam condensation procedures or cementation procedures of indirect restorations.
Liners are relatively thin layers of material used primarily to provide a barrier to protect the dentin from residual reactants diffusing out of a restoration and/or oral fluids that may penetrate leaky tooth-restoration interfaces. They also contribute initial electrical insulation; generate some thermal protection and in some formulations provide pulpal treatment . the need for liners is greatest with pupally extended metallic restorations that are not well bonded to tooth structure and that are not insulating such as amalgam and cast gold or with other indirect restoration.
• Thin liners(1-50 mm) subdivided into solution liners(varnishes2-5 mm) and suspension liners (typically 20-25 mm).
• Thick liners(200-1000 mm= 0.2-1 mm).
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