Abstract
Statement of problem
Evidence comparing the marginal and internal fit of single metal copings fabricated
via selective laser sintering and conventional lost-wax casting is inadequate.
Purpose
The purpose of this systematic review was to compare the fit of single metal copings
fabricated via selective laser sintering and lost-wax casting. Moreover, the effects
of different variables on fit accuracy were determined.
Material and methods
Google Scholar, ScienceDirect, SpringerLink, and Wiley databases were searched electronically
as well as manually. The mean absolute marginal gap, marginal gap, internal gap, axial
gap, and occlusal gap values of single metal copings fabricated via selective laser
sintering and lost-wax casting were statistically analyzed to determine and evaluate
the factors affecting the fit accuracy (α=.05).
Results
Single metal copings fabricated via selective laser sintering had mean absolute marginal
gaps and occlusal gaps similar to those of copings fabricated via lost-wax casting,
based on a subgroup meta-analysis of gaps evaluated using stereomicroscopy (P>.05). The fit of single metal copings was not affected by the type of tooth (P>.05). The conventional impression, the indirect digital scan, and the direct digital
scan led to similar values of mean axial gap, internal gap, and marginal gap for the
copings fabricated via lost-wax casting (P>.05). The indirect and direct digital scans led to similar values of mean axial gap,
internal gap, and marginal gap for the copings fabricated via selective laser sintering
(P>.05). Printed wax patterns provided significantly smaller mean axial gap values than
milled plastic or milled wax patterns for the copings fabricated via lost-wax casting
(P<.05). Printed, milled, and conventional wax patterns had similar mean marginal gaps
and internal gaps for the copings fabricated via lost-wax casting (P>.05). For single copings fabricated via lost-wax casting, Ni-Cr and Co-Cr had similar
mean internal gaps (P>.05).
Conclusions
No statistically significant differences were found between single metal copings fabricated
via selective laser sintering and lost-wax casting. Selective laser sintering can
satisfy the clinical requirement for single metal copings.
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Article info
Publication history
Published online: March 29, 2021
Identification
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© 2021 by the Editorial Council for the Journal of Prosthetic Dentistry.
