Abstract
Statement of problem
How the fracture strength of recently introduced 3-dimensionally (3D) printed interim
materials compares with that of conventional materials is unclear.
Purpose
The purpose of this in vitro study was to compare the fracture load of 4-unit interim
fixed partial dentures made from 3 different materials before and after mastication
simulation.
Material and methods
Based on a master model of a 4-unit fixed partial denture with maxillary left first
premolar and second molar abutment teeth, interim restorations were fabricated from
3 different materials (3D-printed, Temporary CB Resin, milled, PMMA for brain, and
manually manufactured, Luxatemp Plus). The fixed partial dentures (n=30 for each material)
were cemented on 3D-printed model abutment teeth that were connected via a thin latex
layer to a polyurethane base block. The fracture load of 15 fixed partial dentures
of each material was tested without aging. Another 15 fixed partial dentures of each
material were tested after thermomechanical aging.
Results
The mean fracture load was between 186 N and 661 N, and all materials showed significant
lower fracture loads after aging. Before and after aging (before/after ±standard deviation)
milled (661 ±59/568 ±52 N) achieved the highest loads before manually manufactured
(621 ±100/478 ±96 N) and 3D-printed (294 ±83/186 ±70).
Conclusions
The 3D-printed interim restoration material and the inherent manufacturing process
show significant lower fracture loads than the tested alternatives. However, as the
influence of geometric differences could not be quantified, whether this remains true
after correcting for geometric differences remains unclear. For the tested interim
materials, thermocycling and mastication simulation significantly reduced fracture
loads over time, even at loads as low as 50 N.
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Article info
Publication history
Published online: February 16, 2023
Publication stage
In Press Corrected ProofIdentification
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© 2023 by the Editorial Council for the Journal of Prosthetic Dentistry.
