In vitro evaluation of the marginal integrity of CAD/CAM interim crowns

The Journal of Prosthetic Dentistry
Kwang Yong Kelvin KhngFang Qian

Abstract

The accuracy of interim crowns made with computer-aided design and computer-aided manufacturing (CAD/CAM) systems has not been well investigated. The purpose of this in vitro study was to evaluate the marginal integrity of interim crowns made by CAD/CAM compared with that of conventional polymethylmethacrylate (PMMA) crowns. A dentoform mandibular left second premolar was prepared for a ceramic crown and scanned for the fabrication of 60 stereolithical resin dies, half of which were scanned to fabricate 15 Telio CAD-CEREC and 15 Paradigm MZ100-E4D-E4D crowns. Fifteen Caulk and 15 Jet interim crowns were made on the remaining resin dies. All crowns were cemented with Tempgrip under a 17.8-N load, thermocycled for 1000 cycles, placed in 0.5% acid fuschin for 24 hours, and embedded in epoxy resin before sectioning from the mid-buccal to mid-lingual surface. The marginal discrepancy was measured using a traveling microscope, and dye penetration was measured as a percentage of the overall length under the crown. The mean vertical marginal discrepancy of the conventionally made interim crowns was greater than for the CAD/CAM crowns (P=.006), while no difference was found for the horizontal component (P=.276). The mean vertical margin...Continue Reading

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Citations

May 30, 2017·The Journal of Prosthetic Dentistry·Abdulaziz AlHelalAnkur Dahiya
Sep 7, 2017·The Journal of Advanced Prosthodontics·Wan-Sun LeeKyu-Bok Lee
Nov 12, 2019·Journal of Esthetic and Restorative Dentistry : Official Publication of the American Academy of Esthetic Dentistry ... [et Al.]·Sandro B BitencourtAldiéris A Pesqueira
Nov 9, 2019·Journal of Prosthodontics : Official Journal of the American College of Prosthodontists·Chin-Chun PengVan Ramos
May 2, 2018·The Journal of Advanced Prosthodontics·Hyun-Wook WooDu-Hyeong Lee
Apr 14, 2020·Technology and Health Care : Official Journal of the European Society for Engineering and Medicine·Saurabh ChaturvediMohammed A Alfarsi

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