Krejci I, Lieber C M, Lutz F
Department of Preventive Dentistry, Periodontology and Cariology, Dental Institute, Zurich University, Switzerland.
Dent Mater. 1995 Jan;11(1):34-40. doi: 10.1016/0109-5641(95)80006-9.
The study was conducted to measure the time required to remove large totally bonded tooth-colored posterior restorations and related tooth substance loss. This information was collected to determine if there were differences between bonded restorations and conventional restorations.
Molars were restored with the following materials: amalgam, composite, glass ionomer cement or glass ceramic cusp coverages. After submitting them to an in vitro aging process, they were attached to a lower jaw model in a phantom head. Six dentists removed the test restorations under standardized, quasi-clinical conditions.
While the amalgam was completely removed, some glass ionomer cement vestiges were found. In the glass-ceramic group, the margins were covered with remnants of the composite luting agent in several places. The most restorative material was left in the composite group. The loss of tooth structure after removal of amalgam, glass ionomer cement, composite and glass ceramic was 17.6 mm3, 19.6 mm3, 39.9 mm3 and 41.8 mm3, respectively. When comparing the removal time, the glass ionomer group scored best with an average of 11.9 min followed by the amalgam group with an average of 15.2 min, followed by 24.9 min for the composite group and 30.4 min for the glass ceramic group.
The removal of totally bonded posterior restorations made of composite and ceramic is more technically demanding and more time-consuming than the removal of glass ionomer and amalgam restorations.
本研究旨在测量去除大型全粘结后牙牙齿颜色修复体所需的时间以及相关的牙齿物质损失。收集这些信息以确定粘结修复体和传统修复体之间是否存在差异。
用以下材料修复磨牙：汞合金、复合树脂、玻璃离子水门汀或玻璃陶瓷牙尖覆盖物。在使其经历体外老化过程后，将它们附着在模拟头的下颌模型上。六位牙医在标准化的准临床条件下去除测试修复体。
汞合金完全被去除，发现一些玻璃离子水门汀残余物。在玻璃陶瓷组中，边缘多处被复合树脂粘结剂残余物覆盖。复合树脂组残留的修复材料最多。去除汞合金、玻璃离子水门汀、复合树脂和玻璃陶瓷后牙齿结构的损失分别为17.6立方毫米、19.6立方毫米、39.9立方毫米和41.8立方毫米。比较去除时间时，玻璃离子水门汀组表现最佳，平均为11.9分钟，其次是汞合金组，平均为15.2分钟，复合树脂组为24.9分钟，玻璃陶瓷组为30.4分钟。
去除由复合树脂和陶瓷制成的全粘结后牙修复体在技术上比去除玻璃离子水门汀和汞合金修复体要求更高且更耗时。
