Ishii Noriko, Maseki Toshio, Nara Yoichiro
Department of Adhesive Dentistry, School of Life Dentistry at Tokyo, The Nippon Dental University.
Dent Mater J. 2017 May 31;36(3):357-367. doi: 10.4012/dmj.2016-289. Epub 2017 Mar 29.
To examine the bonding state of metal-free CAD/CAM onlay restorations made from two popular resin composite blocks and a typical glass-ceramic block after cyclic loading, with and without immediate dentin sealing (IDS). Standardized mesial-distal-occlusalbuccal (MODB) cavities in 24 extracted human molars were prepared. The intra-cavity dentin surfaces of half of the cavities were immediately sealed with all-in-one adhesive and flowable composite, while those of the other half were not. All cavities were scanned, from which CAD/CAM onlays were fabricated from three types of block and cemented with an adhesive resin cement system. The restored specimens were subjected to cyclic loading and the intra-cavity microtensile bond strength was measured. IDS improves not only the internal bond strength, but also the bond reliability of metal-free CAD/CAM onlay restorations. The resin composite block seems to be more effective than a typical glass-ceramic block for achieving both high bond strength and excellent bond reliability.
为了研究在循环加载后，有无即时牙本质封闭（IDS）情况下，由两种常见树脂复合材料块和一种典型玻璃陶瓷块制成的无金属CAD/CAM嵌体修复体的粘结状态。在24颗拔除的人类磨牙上制备标准化的近中-远中-咬合-颊侧（MODB）洞型。其中一半洞型的洞内牙本质表面用多功能粘结剂和流动树脂复合材料立即封闭，另一半则不封闭。对所有洞型进行扫描，用三种类型的块材制作CAD/CAM嵌体，并用粘结树脂粘结系统进行粘结。对修复后的标本进行循环加载，并测量洞内微拉伸粘结强度。即时牙本质封闭不仅提高了无金属CAD/CAM嵌体修复体的内部粘结强度，还提高了其粘结可靠性。对于实现高粘结强度和优异粘结可靠性，树脂复合材料块似乎比典型的玻璃陶瓷块更有效。
