Abstract
Statement of problem
Investigations on the effectiveness of new methods for optimizing the fabrication
of oral devices are lacking.
Purpose
The purpose of this in vitro study was to evaluate stress distribution with photoelastic
analysis in the periradicular area of teeth supporting occlusal devices fabricated
by 5 different processes.
Material and methods
The occlusal devices were fabricated by vacuum thermoforming, heat-polymerized acrylic
resin, chemical polymerized acrylic resin, 3-dimensional printing, and milling (computer-aided
manufacturing). The devices were evaluated regarding initial fit, number of adjustments
for passive fit, and stress distribution under 100-N and 400-N loads in the periradicular
locations of posterior teeth.
Results
The 3-dimensional printing device did not require any adjustment for initial adaptation
to the photoelastic model and presented a little friction with the model. The heat-polymerized
acrylic resin device did not seat initially, requiring more sites of adjustment until
passive adaptation. At 100-N and 400-N loads, the use of the computer-aided manufacturing
occlusal device resulted in the lowest stresses in periradicular areas (0.744 and
1.583, respectively), and the 3-dimensional printing occlusal device produced the
highest stresses with a 400-N load application (2.427). The lowest mean of fringe
pattern was observed for the computer-aided manufacturing device, and the highest
mean of fringe pattern was observed for the vacuum thermoforming device.
Conclusions
The computer-aided design and computer-aided manufacturing milled occlusal device
presented the best initial adaptation and transferred lower stresses to the periradicular
areas than the other evaluated devices.
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Article info
Publication history
Published online: August 02, 2021
Publication stage
In Press Corrected ProofFootnotes
The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
This research did not receive any specific grant from funding agencies in the public, commercial, or not-for-profit sectors.
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© 2021 by the Editorial Council for the Journal of Prosthetic Dentistry.
