Rosentritt Martin, Behr Michael, Kolbeck Carola, Handel Gerhard
Engineer, Department of Prosthetic Dentistry, University Clinics, Regensburg, Germany.
Eur J Dent. 2007 Jan;1(1):25-30.
Computer-aided design (CAD) and manufacturing (CAM) allows the milling of high strength zirconia fixed partial dentures (FPD), however bonding to an inert ZrO(2) ceramic surface may effect the marginal integrity of the FPDs. The aim of this investigation was to evaluate the marginal adaptation of zirconia FPDs at the interfaces between zirconia, cement, and tooth.
32 3-unit FPDs were fabricated of the CAD/CAM Y-TZP zirconia (Lava, 3M Espe, Germany) according to the manufacturers' instructions. Resin cements with corresponding primer and bonding systems were used to lute the FPDs: Compolute/EBS multi (3M Espe, Germany), Panavia F/ED (Kuraray, Japan), Variolink 2/Syntac classic (Ivoclar-Vivadent, FL) and RelyX Unicem/without treatment (3M Espe, Germany). Aualloy FPDs (BioPontostar, Bego, Germany) were cemented with RelyX Unicem and Harvard (Harvard, Germany) as the control. Marginal adaptation was evaluated with scanning electron microscopy using replica specimen before and after artificial aging. After aging, microleakage tests were performed with fuchsine solution. The interfaces between cement-tooth and cement-FPD were examined.
At the interfaces (cement-tooth and cement-FPD), the systems showed a 95% or higher perfect margin before and after aging. Only Variolink2/Syntac had a marginal adaptation, lower than a 70% perfect margin. Generally, the fuchsine penetration was below 20%, only BioPontstar/Harvard andLava/Variolink2 showed penetration results between 80% and 100%.
The success of the adhesive cementation of zirconia FPDs depends on the cement system. Under the conditions of this study, zirconia FPDs showed good to sufficient marginal integrity in combination with Panavia/ED, Compolute/EBS and RelyX Unicem.
计算机辅助设计（CAD）和制造（CAM）技术可用于铣削高强度氧化锆固定局部义齿（FPD），然而，与惰性ZrO₂陶瓷表面的粘结可能会影响FPD的边缘完整性。本研究的目的是评估氧化锆FPD在氧化锆、粘结剂和牙齿之间界面处的边缘适合性。
按照制造商的说明，用CAD/CAM Y-TZP氧化锆（德国3M Espe公司的Lava）制作32个3单位FPD。使用相应的底漆和粘结系统的树脂粘结剂来粘结FPD：Compolute/EBS multi（德国3M Espe公司）、Panavia F/ED（日本可乐丽公司）、Variolink 2/Syntac classic（列支敦士登Ivoclar-Vivadent公司）和RelyX Unicem/未处理（德国3M Espe公司）。用RelyX Unicem和Harvard（德国Harvard公司）粘结金合金FPD（德国Bego公司的BioPontostar）作为对照。在人工老化前后，使用复型标本通过扫描电子显微镜评估边缘适合性。老化后，用品红溶液进行微渗漏测试。检查粘结剂与牙齿和粘结剂与FPD之间的界面。
在界面处（粘结剂与牙齿和粘结剂与FPD），各系统在老化前后均显示出95%或更高的完美边缘。只有Variolink2/Syntac的边缘适合性低于70%的完美边缘。一般来说，品红渗透低于20%，只有BioPontstar/Harvard和Lava/Variolink2的渗透结果在80%至100%之间。
氧化锆FPD粘结剂粘结的成功取决于粘结剂系统。在本研究条件下，氧化锆FPD与Panavia/ED、Compolute/EBS和RelyX Unicem结合时显示出良好至足够的边缘完整性。
