Ziemiecki T L, Wendt S L, Leinfelder K F
UCONN Health Center, School of Dental Medicine, Farmington, CT 06032.
Am J Dent. 1992 Aug;5(4):203-7.
The purpose of this study was to utilize a methodology to measure proximal wear of posterior resin composites with respect to time. A group of 10 teeth (5 premolars and 5 molars) were restored with P-30, a posterior resin composite restorative. At placement the proximal contacts were judged to be closed visually, and with unwaxed dental floss. The patients were then recalled at intervals of 6, 12, and 36 months for indirect wear evaluations. Resin composite transfer copings were made and indexed on baseline models. A zoom stereomicroscope, at 20 microns resolution, was used to determine proximal wear. For the posterior restorative material the premolar and molar teeth wore at the same rate. The amount of wear was statistically greater for premolar teeth at 6 and 12-month evaluation periods than molar teeth. At 36 months, there was no statistical difference in wear between premolar and molar teeth.
本研究的目的是运用一种方法来测量后牙树脂复合材料的近中面磨损随时间的变化情况。选取一组10颗牙齿（5颗前磨牙和5颗磨牙），用后牙树脂复合材料P-30进行修复。修复时，通过肉眼观察以及使用未上蜡的牙线判断近中接触是否紧密。然后每隔6个月、12个月和36个月召回患者进行间接磨损评估。制作树脂复合材料转移帽并在基线模型上进行标记。使用分辨率为20微米的变焦立体显微镜来确定近中面磨损情况。对于后牙修复材料，前磨牙和磨牙的磨损速率相同。在6个月和12个月的评估期，前磨牙的磨损量在统计学上大于磨牙。在36个月时，前磨牙和磨牙的磨损在统计学上没有差异。
