Fractography of clinically fractured, implant-supported dental computer-aided design and computer-aided manufacturing crowns
Lohbauer U, Belli R, Cune MS, Schepke U (2017)
Publication Type: Journal article
Publication year: 2017
Journal
Book Volume: 5
Pages Range: 2050313X17741015
Abstract
Today, a substantial part of the dental crown production uses computer-aided design and computer-aided manufacturing (CAD/CAM) technology. A recent step in restorative dentistry is the replacement of natural tooth structure with pre-polymerized and machined resin-based methacrylic polymers. Recently, a new CAD/CAM composite was launched for the crown indication in the load-bearing area, but the clinical reality forced the manufacturer to withdraw this specific indication. In parallel, a randomized clinical trial of CAD/CAM composite crowns luted on zirconia implant abutments revealed a high incidence of failure within the first year of service. Fractured crowns of this clinical trial were retrieved and submitted to a fractographic examination. The aim of the case series presented in this article was to identify failure reasons for a new type of CAD/CAM composite crown material (Lava Ultimate; 3M Oral Care, St. Paul, Minnesota, USA) via fractographic examinations and analytical assessment of luting surfaces and water absorption behavior. As a result, the debonding of the composite crowns from the zirconia implant abutments was identified as the central reason for failure. The adhesive interface was found the weakest link. A lack of silica at the zirconia surface certainly has compromised the bonding potential of the adhesive system from the beginning. Additionally, the hydrolytic stress released from swelling of the resin-based crown (water absorption) and transfer to the luting interface further added to the interfacial stress and most probably contributed to a great extend to the debonding failure.
Authors with CRIS profile
Ulrich Lohbauer
Medizinische Fakultät
Renan Belli
Department of Operative Dentistry and Periodontology
Involved external institutions
Netherlands (NL)How to cite
APA:
Lohbauer, U., Belli, R., Cune, M.S., & Schepke, U. (2017). Fractography of clinically fractured, implant-supported dental computer-aided design and computer-aided manufacturing crowns. SAGE Open Medical Case Reports, 5, 2050313X17741015. https://dx.doi.org/10.1177/2050313X17741015
MLA:
Lohbauer, Ulrich, et al. "Fractography of clinically fractured, implant-supported dental computer-aided design and computer-aided manufacturing crowns." SAGE Open Medical Case Reports 5 (2017): 2050313X17741015.
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