PMID: 18203487Jan 22, 2008Paper

Effect of sintering on the marginal and internal fit of CAD/CAM-fabricated zirconia frameworks

Dental Materials Journal
Jun KuniiToshihisa Fujiwara

Abstract

The aim of this study was to investigate the effect of post-machining sintering on marginal and internal fit of CAD/CAM-fabricated zirconia frameworks. Single crown copings (A: abutment), three-unit bridge frameworks (APA, P: pontic), four-unit bridge frameworks (APPA), and five-unit bridge frameworks (A1P1A2P2A3) were fabricated with raw-stage zirconia blanks using a commercial CAD/CAM system (KATANA, Noritake Dental Supply Co. Ltd., Aichi, Japan). Crown copings and frameworks were cemented to their respective master abutment models, and thickness of the cement layer was measured at specific measuring points. Marginal and internal fit of both APA and APPA were within clinical acceptance. However, the marginal gap and thickness of the cement layer on the axial surface of the pontic side of APA and APPA were slightly higher than those of the non-pontic side. As for the marginal gap of A1P1A2P2A3 framework, it was superior to those of APA and APPA because the center abutment supported the framework to prevent distortion.

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Citations

May 25, 2010·Clinical Oral Investigations·Philipp KohorstMeike Stiesch
Aug 27, 2013·Dental Materials : Official Publication of the Academy of Dental Materials·Liliana G May, J Robert Kelly
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