Abstract
Statement of problem
Computer-aided design and computer-aided manufacturing (CAD-CAM) milling and 3-dimensional
printing are readily available for the fabrication of interim restorations. However,
studies comparing the marginal gap after a long period of function are lacking.
Purpose
The purpose of this in vitro study was to evaluate the marginal gap of interim crowns
fabricated from different materials and with different techniques before and after
receiving simulated oral stress.
Material and methods
Two conventional resins, a polymethyl methacrylate resin (Unifast Trad) and a bis-acryl
resin (Protemp 4), a milled polymethyl methacrylate resin (Brylic Solid), and a 3-dimensionally
printed bis-acrylate resin (Freeprint Temp) were evaluated. Interim crowns (n=10/group)
were fabricated by using the conventional direct technique for Unifast Trad and Protemp
4, with a maxillary molar Dentiform tooth as a template and by using CAD-CAM for Brylic
Solid and Freeprint Temp. After finishing and cementation, the marginal gap was measured
at the middle of all surfaces and line angles. The average value from all 8 sites
was used to represent the marginal gap of each specimen. Subsequently, all interim
crowns were thermocycled (5000 cycles of 5 °C and 55 °C), and cyclic occlusal load
with a 5-mm steel ball at central pit (100 000 at 100 N) and the marginal gap were
remeasured. The effects of different material types and aging on marginal gap were
analyzed with 2-way ANOVA. The difference in marginal gap before and after aging was
analyzed by using the paired t test, and the increased marginal gap was analyzed with 1-way ANOVA (α=.05).
Results
Both the material types and the aging regimen had a significant effect on marginal
gap (P<.001). The Unifast Trad group and the Protemp 4 group had a significantly larger
marginal gap than the Brylic Solid group and the Freeprint Temp group, both before
and after aging (P<.01). Each group had a significantly larger marginal gap after the aging regimen
(P<.001). The increased marginal gap was greatest in the Unifast Trad group, which differed
statistically from the Freeprint Temp group (P=.004) but not from the other groups (P>.05).
Conclusions
The interim crowns fabricated with the Brylic Solid and the Freeprint Temp had a smaller
marginal gap than those fabricated with Unifast Trad and Protemp 4, both before and
after aging. The Unifast Trad group showed a significantly larger increase in marginal
gap after the aging regimen than the Freeprint Temp group.
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Article info
Publication history
Published online: July 03, 2020
Footnotes
Supported in part by Faculty of Dentistry, Khon Kaen University.
Identification
Copyright
© 2020 by the Editorial Council for The Journal of Prosthetic Dentistry.
