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The International Journal of Prosthodontics



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Int J Prosthodont 31 (2018), No. 5     8. Oct. 2018
Int J Prosthodont 31 (2018), No. 5  (08.10.2018)

Page 478-480, doi:10.11607/ijp.5831, PubMed:30180235

Fracture Resistance of Computer-Aided Design/ Computer-Assisted Manufactured Glass-Ceramic Incisor Crowns Fabricated on Reverse-Tapered Preparations
Carbajal Mejía, Jeison B. / Wakabayashi, Kazumichi / Nakamura, Takashi / Yatani, Hirofumi
Purpose: To evaluate the fracture resistance of computer-aided design/computer-assisted manufactured (CAD/CAM) glass-ceramic incisor crowns fabricated on reverse-tapered preparations.
Materials and Methods: Resin abutments with known total occlusal convergence angles (-8, 0, and 12 degrees; n = 20) were scanned with the TRIOS scanner, and glass-ceramic crowns were fabricated with KaVo Arctica, stored in water for either 1 or 30 days, and submitted to fracture test.
Results: The fracture resistance of crowns made on reverse-tapered preparations was not significantly different (P = .471) from crowns fabricated over abutments with 0- or 12-degree tapers, irrespective of the water storage period.
Conclusion: The fracture resistance of anterior glass-ceramic crowns fabricated over reverse-tapered preparations was similar to that of crowns made on abutments with 0- or 12-degree tapers.