Importance of thermal expansion in dentistry
1) of the filling material should match that of the
tooth structures. e.g. if of the restoration is
greater than that of enamel, a gap will develop if
the patient takes a cold drink. As shown in figure
2) of denture base material should match that of
synthetic tooth material so they expand and contract
similarly with hot and cold food.
3) Thermoplastic materials such as dental waxes (used to make wax patterns for
restorations) have a large . So they contract greatly and this contraction should be
compensated.
4) In constructing porcelain-fused to metal restorations (PFM), restorations should
have slightly more than that of porcelain to increase bonding between them.
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RESTORATION
RESTORATION
Cooled
Body
temperature
Marginal
Percolation
