Effect of manufacturing techniques on the marginal and internal fit of cobalt-chromium implant-supported multiunit frameworks

The Journal of Prosthetic Dentistry
Elif Tuba AkçinYavuz Aslan

Abstract

Subtractive and additive computer-aided design and computer-aided manufacturing (CAD-CAM) systems have been used in the fabrication of cobalt-chromium (Co-Cr) long-span restorations. However, the accuracy of fit of multiunit frameworks is unclear. The purpose of this in vitro study was to compare the marginal and internal fit of implant-supported, cement-retained 3-unit, 4-unit, and 5-unit Co-Cr metal frameworks fabricated by the lost wax (LW), CAD-CAM milling, and selective laser melting (SLM) techniques. A total of 90 Co-Cr metal frameworks were fabricated for 3-unit, 4-unit, or 5-unit implant-supported cement-retained restorations on stock abutments with 3 different manufacturing technique subgroups (LW, CAD-CAM milling, and SLM). The silicone replica technique was used to evaluate the marginal and internal discrepancy values. By using a light microscope at ×45 magnification and a digital measurement program, the thickness of the silicone layer was measured at 16 reference points on each abutment for a total of 3360 measurements. The effect of manufacturing techniques and number of units (groups) on discrepancy values was evaluated using a full factorial ANOVA model. Group and manufacturing technique effects were analyzed se...Continue Reading

Citations

Jun 5, 2019·Journal of Clinical Medicine·Keunbada SonByoung-Ju Yun
Feb 23, 2020·Biomaterial Investigations in Dentistry·Per Svanborg, Lars Hjalmarsson
Jun 19, 2020·International Journal of Environmental Research and Public Health·Roberto PadrósFrancisco Javier Gil
Dec 18, 2020·Clinical Implant Dentistry and Related Research·Yu PanEdmond H N Pow

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