Abstract
Statement of problem
New techniques and materials for the laboratory fabrication of interim fixed dental
prostheses have gained in popularity, yet how their failure strengths compare with
conventional chairside materials is unclear.
Purpose
The purpose of this in vitro study was to compare the strength of computer-aided design
and computer-aided manufacturing (CAD-CAM) milled polymethylmethacrylate (PMMA) or
3-dimensionally (3D) printed bis-acryl interim fixed dental prostheses with a traditional
chairside-dispensed autopolymerizing bis-acryl prosthesis while taking into account
the effect of loading rate and storage time.
Material and methods
A dentiform mandibular second premolar and second molar with a first molar pontic
were prepared and scanned. Three groups of 3-unit interim fixed dental prostheses
were fabricated: milled PMMA, 3D-printed bis-acryl, and chairside-dispensed autopolymerizing
bis-acryl. The interim prostheses were evaluated for fit with a silicone disclosing
material and cemented onto 3D-printed resin dies. The specimens were stored in 100%
humidity at 37 °C. After 1 or 30 days of storage, the cemented interim prostheses
were loaded to failure in a universal testing machine at 1 or 10 mm/min (n=15/group).
Failure loads were analyzed by 3-way analysis of variance and multiple comparisons
(α=.05).
Results
Mean ±standard deviation failure loads ranged from 363 ±93 N (3D-printed bis-acryl,
30 days, 1 mm/min) to 729 ±113 N (milled PMMA, 24 hours, 1 mm/min). Loading rate did
not significantly affect failure load of the interim prostheses (P=.306). After 30 days of storage in 100% humidity, the failure load of milled PMMA
and 3D-printed bis-acryl interim prostheses decreased significantly, but the chairside
autopolymerizing bis-acryl prostheses were not affected. After 30 days of storage,
the failure loads of milled PMMA and chairside autopolymerizing bis-acryl were not
significantly different.
Conclusions
Regardless of loading rate, interim fixed dental prostheses from milled PMMA had the
highest initial strength 1 day after storage. Thirty days of exposure to humidity,
however, reduced the strength of the CAD-CAM–manufactured interim prostheses, whereas
the traditional chairside prostheses retained their strength.
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Article info
Publication history
Published online: December 10, 2021
Identification
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© 2021 by the Editorial Council for the Journal of Prosthetic Dentistry.
