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DM Exam 2

Terms in this set (193)

T/F Adhesives do not reduce or eliminate micro leakage.
False
What are adhesives commonly used for?
to bond or join two objects together
Do adhesives involve forming or altering the atomic bonds of the materials?
not usually
Name some befits of adhesives:
*reduction of recurrent caries
*reduction of microleakage
*retention of restorations
*reduces postoperative sensitivity caused by microleakage
*sealing of the margin of restorations reduces or eliminates microeakage and reduces post-op sensitivity and staining
undercuts and other mechanical locks are nto necessary when adhesive materials are used.
T/F adhesives reduce or eliminate staining around margins of restorations.
True
T/F undercuts and other mechanical locks are always necessary when adhesive materials are used.
False
What is microleakage?
the seeping and leaking of fluids and bacteria between the restoration and tooth junction or margin
T/F microleakage can cause staining at margin, increased post op sensitivity, and increased likelihood of recurrent carries.
True
What co-efficient of thermal expansion must a restoration have in comparison to tooth structure?
as close as possible to being the same as the tooth structure
What happens when the tooth and the restoration have different co -efficent of thermal expansions?
the tooth and restoration expand and contract at different rates this allows fluid to go in at the margin
What is it called when the tooth and the restoration repeatedly expand and contract at different rates allowing fluid to go into the margin of a restoration?
percolation
what type of bonding involves devices easily seen by the human eye such as dovetails?
Macromechanical bonding
What type of bonding involves surface roughness that is not seen easily by the human eye; such as acid etch?
micromechanical bonding
What is the gold standard of adhesion in dentistry?
acid etch adhesives
What does the process of acid etch adhesion involve?
macro retention tends to weaken the tooth while micro retention tends to distribute mechanical forces more evenly
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