Influence of attaching mechanical retentive devices onto frameworks on fracture resistance of implant-supported zirconia crowns

• Published in: Dental Materials Journal Vol. 43; no. 3; pp. 359 - 366
• Main Authors: KOBAYASHI, Tatsuro, HONDA, Junichi, KUBOCHI, Kei, IWASAKI, Taro, WATANABE, Yusuke, KOMINE, Futoshi
• Format: Journal Article
• Language: English
• Published: Japan The Japanese Society for Dental Materials and Devices 25.05.2024; Japanese Society for Dental Materials and Devices; Japan Science and Technology Agency
• Subjects: Devices; Fracture load; Fracture toughness; Implant-supported zirconia crowns; Layering material; Load resistance; Mechanical properties; Mechanical retentive devices; Porcelain; Resins; Veneers; Zirconia; Zirconium dioxide; Mechanical retentive devices; Fracture load; Implant-supported zirconia crowns; Layering material
• ISSN: 0287-4547; 1881-1361
• DOI: 10.4012/dmj.2023-188

This study investigated the fracture load of implant-supported zirconia crowns (IZCs), in which indirect composite resin or feldspathic porcelain was layered onto zirconia frameworks with mechanical retentive devices. Three different zirconia frameworks were assessed: attaching mechanical retentive devices on glaze and opaque porcelain materials (GL and OP groups, respectively), and no attaching mechanical retentive devices (ND group). The frameworks were layered using feldspathic porcelain (FP veneer) and indirect composite resin (IC veneer). Fracture load of the specimens was measured. In FP veneer, the GL group recorded the highest fracture load. In the IC veneer, the GL and OP groups had significantly higher fracture load than the ND group. The fracture resistance of IZCs can be enhanced by applying glaze material before attaching mechanical retentive devices for porcelain layering. The mechanical retentive devices effectively yielded mechanical interlocking between the zirconia frameworks and the IC veneer in GL and OP groups.