Department of Oral Biomaterials and Technology, School of Dentistry, Showa University, Tokyo, Japan.
Dent Mater J. 2011;30(3):419-24. doi: 10.4012/dmj.2010-213. Epub 2011 May 20.
A novel method was developed to fabricate all-ceramic restorations which comprised CAD/CAM-fabricated machinable ceramic bonded to CAD/CAM-fabricated zirconia framework using resin cement. The feasibility of this fabrication method was assessed in this study by investigating the bonding strength of a machinable ceramic to zirconia. A machinable ceramic was bonded to a zirconia plate using three kinds of resin cements: ResiCem (RE), Panavia (PA), and Multilink (ML). Conventional porcelain-fused-to-zirconia specimens were also prepared to serve as control. Shear bond strength test (SBT) and Schwickerath crack initiation test (SCT) were carried out. SBT revealed that PA (40.42 MPa) yielded a significantly higher bonding strength than RE (28.01 MPa) and ML (18.89 MPa). SCT revealed that the bonding strengths of test groups using resin cement were significantly higher than those of Control. Notably, the bonding strengths of RE and ML were above 25 MPa even after 10,000 times of thermal cycling -adequately meeting the ISO 9693 standard for metal-ceramic restorations. These results affirmed the feasibility of the novel fabrication method, in that a CAD/CAM-fabricated machinable ceramic is bonded to a CAD/CAM-fabricated zirconia framework using a resin cement.
本研究旨在评估一种新型全瓷修复体的制作方法的可行性，该方法通过使用树脂水门汀将 CAD/CAM 可切削陶瓷与 CAD/CAM 制造的氧化锆基底结合。该方法采用三种树脂水门汀（ResiCem [RE]、Panavia [PA]和 Multilink [ML]）将可切削陶瓷与氧化锆板粘结。同时还制备了传统的烤瓷熔附氧化锆试件作为对照。进行了剪切粘结强度测试（SBT）和 Schwickerath 裂纹起始测试（SCT）。SBT 结果表明，PA（40.42 MPa）的粘结强度明显高于 RE（28.01 MPa）和 ML（18.89 MPa）。SCT 结果表明，使用树脂水门汀的实验组的粘结强度明显高于对照组。值得注意的是，RE 和 ML 的粘结强度在经过 10000 次热循环后仍高于 25 MPa，符合 ISO 9693 标准对金属陶瓷修复体的要求。这些结果证实了该新型制作方法的可行性，即通过树脂水门汀将 CAD/CAM 制造的可切削陶瓷与 CAD/CAM 制造的氧化锆基底结合。
