Dimensional precision of implant-supported frameworks fabricated by 3d printing
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Universidade Federal de Minas Gerais
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Artigo de periódico
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Statement of problem. Selective laser melting (SLM) is a promising additive technology for clinical
practice, but data on dimensional precision assessed by marginal fit combined with stress and strain
investigations of implant-supported fixed partial dentures (FPDs) are lacking.
Purpose. The purpose of this in vitro study was to verify whether the SLM additive manufacturing
technology provides better dimensional precision for 3-unit FPD frameworks than subtractive
manufacturing with soft metal block (SMB) milling and the standard casting technique.
Material and methods. Thirty 3-unit implant-supported FPDs with Co-Cr frameworks were made
by the casting, SMB milling, and SLM methods (n=10). The marginal fit between the framework
and the implant abutment was evaluated with photoelastic (PH) and strain gauge (SG) models.
Stress and strain in the implant-supported system were measured by quantitative PH and SG
analyses after prosthetic screw tightening. Data were subjected to the Kruskal-Wallis test, Mann-
Whitney U test, and Spearman correlation test (a=.05).
Results. The framework manufacturing method affected the marginal fit (P<.001), stress, and strain
values (P<.05). The SLM group showed the best mean ±standard deviation marginal fit (mm) (PH
model: 8.4 ±3.2; SG model: 6.9 ±2.1) in comparison with SMB milling (PH model: 42.3 ±15.7; SG
model: 41.3 ±15.3) and casting (PH model: 43.5 ±27.8; SG model: 41.3 ±24.6) (P<.05). SLM showed
lower mean ±standard deviation stress and strain values (60.3 ±11.6 MPa; 91.4 ±11.1 mstrain) than
casting (225.5 ±142.8 MPa; 226.95 ±55.4 mstrain) and SMB milling (218.6 ±101.7 MPa; 289.7 ±89.3
mstrain) (P<.05). A positive correlation was observed between fit and stress or strain for all groups
(P<.05).
Conclusions. Three-unit FPD frameworks made using the SLM technology showed better
dimensional precision than those obtained with the casting or SMB milling methods
Abstract
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Denture partial fixed, Dental Implants
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https://www.sciencedirect.com/science/article/pii/S0022391319300988