Statement of problem
Provisional resin crowns may be used for an extended period while complex treatments
are completed. The crowns function intraorally; therefore, moisture absorption and
thermal cycling may affect the physical properties of acrylic resin, causing a change
in marginal gap size.
Purpose
The purpose of this pilot study was to examine the effect of long-term water absorption
and thermal cycling on marginal gap size of polymethyl methacrylate copolymer and
bis-acrylic composite resin crowns.
Material and methods
Specimens (n=10) were fabricated from 2 acrylic resins: a polymethyl methacrylate
(Alike) and a bis-acrylic composite resin (Provitec). Specimens were first fabricated
on a metal master die. Custom die stems were fabricated for each specimen from a low-fusing
alloy (Cerroblend) to eliminate the factor of polymerization shrinkage. Specimens
were then fitted to assure a standardized, pre-experimental marginal gap range of
≤ 25 μm. Specimens were stored in a humidor at 37°C and 97% relative humidity for
1 year and subsequently thermal cycled (5°C to 60°C, 6-second dwell time, for 8000
cycles). Measurements in micrometers of the marginal gap were recorded using a microscope
equipped with a digital video camera and image analysis software before and after
treatment. A 2-way analysis of variance with a split design was performed for factors
of materials and treatment (α=.05).
Results
For the factor of material, there was no significant difference; however, there was
a significant difference between treatments, with a significantly greater increase
in marginal gap size after thermal cycling (P<.002).
Conclusion
Provisional crowns made from either a bis-acrylic resin composite or a polymethyl
methacrylate copolymer demonstrated loss of marginal adaptation during a simulated
long-term period of service.
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Article info
Publication history
New Jersey Dental School, Newark, NJ
Identification
Copyright
© 2006 The Editorial Council of The Journal of Prosthetic Dentistry. Published by Elsevier Inc. All rights reserved.
