Abstract
Statement of problem
The marginal and internal adaptation of a fixed dental prosthesis depends on a variety
of factors, finish line designs being one of them. A clear consensus as to which finish
line design can provide a better marginal and internal adaptation with respect to
cobalt-chromium metal alloy copings fabricated by using computer-aided design and
computer-aided manufacturing (CAD-CAM) technology is lacking.
Purpose
The purpose of this systematic review and meta-analysis was to evaluate the effect
of different finish line preparations on the marginal and internal adaptation of cobalt-chromium
metal alloy copings fabricated by using CAD-CAM technology.
Material and methods
Electronic (PubMed, Cochrane, EBSCOhost, and Google Scholar) and manual searches were
conducted for articles published from January 2010 to December 2020 to identify relevant
studies evaluating the effect of different finish line preparations (chamfer, deep
chamfer, shoulder, rounded shoulder) on the marginal and internal adaptation of cobalt-chromium
metal alloy copings fabricated by using CAD-CAM technology.
Results
A total of 573 articles were obtained via electronic search, and 10 articles were
obtained through manual search, of which 24 in vitro studies were selected after title,
abstract, and full-text screening and were included for both qualitative and quantitative
analyses. The marginal adaptation was evaluated under the parameters of marginal gap,
absolute marginal discrepancy, and vertical marginal discrepancy, whereas internal
adaptation was evaluated under the parameters of internal gap, cervical discrepancy,
axial discrepancy, and occlusal discrepancy. The methods of CAD-CAM fabrication (direct
metal laser sintering, hard milling, and soft milling) were considered under the subgroup
analysis.
Conclusions
An overall better marginal and internal adaptation was observed with shoulder and
rounded shoulder finish line designs when CAD-CAM methods were used for coping fabrication.
Marginal and internal adaptation in chamfer and deep chamfer finish line designs showed
better results with soft milling and direct metal laser sintering methods, whereas
shoulder finish line showed better results with hard milling.
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Article info
Publication history
Published online: October 26, 2021
Identification
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© 2021 by the Editorial Council for the Journal of Prosthetic Dentistry.
