Department of Prosthodontics, Heidelberg University Hospital, Heidelberg, Germany.
Institute of Medical Biometry and Informatics, Heidelberg University Hospital, Heidelberg, Germany.
J Prosthodont Res. 2020 Jan;64(1):85-89. doi: 10.1016/j.jpor.2019.04.004. Epub 2019 May 10.
To investigate occlusal wear of resin denture teeth in partial removable dental prostheses worn by partially edentulous patients.
Thirty patients with partial removable dental prostheses were included in the study. Thirty-two patients with complete dentures served as a reference group. Occlusal wear after two years was evaluated indirectly using gypsum casts and a three-dimensional laser-scanner device. Overall wear of complete occlusal surfaces and maximum wear of occlusal contact areas were measured. Patient and prosthesis data were analyzed using univariate and multiple linear mixed models.
Overall wear of denture teeth in partial removable dental prostheses was 91 (SD 85) μm, and maximum wear of occlusal contact areas was 329 (SD 204) μm (means and standard deviations). Average and maximum wear values for teeth in complete dentures were both lower than those for teeth in partial removable dental prostheses. However, differences between wear of different types of denture did not reach statistical significance after adjustment for gender, type of tooth, dental status of the opposing jaw, and antagonist material. Statistical analysis revealed that wear was greater for denture teeth occluding with ceramic crowns and/or fixed partial dentures as antagonists.
Resin denture teeth in partial removable and complete dental prostheses are subjected to clinically important occlusal wear that might destabilize occlusion and cause further problems. Patient-related factors and dental status affect wear behavior and should be taken into consideration when treating patients with removable dentures.
研究部分义齿患者佩戴的局部可摘义齿中树脂义齿牙的咬合磨损情况。
本研究纳入了 30 名佩戴局部可摘义齿的患者。32 名佩戴全口义齿的患者作为参考组。使用石膏模型和三维激光扫描设备间接评估佩戴两年后的咬合磨损情况。测量完整咬合面的总磨损和咬合接触区的最大磨损。使用单变量和多变量线性混合模型分析患者和义齿数据。
局部可摘义齿中义齿牙的总磨损为 91μm（SD85μm），最大咬合接触区磨损为 329μm（SD204μm）（平均值和标准差）。全口义齿中牙齿的平均和最大磨损值均低于局部可摘义齿中的牙齿，但在调整性别、牙型、对颌牙的牙齿状况和对颌材料后，两种义齿的磨损差异无统计学意义。统计分析显示，与陶瓷冠和/或固定局部义齿作为对颌的义齿牙的磨损更大。
局部可摘义齿和全口义齿中的树脂义齿牙会发生临床上重要的咬合磨损，这可能会破坏咬合稳定并导致进一步的问题。患者相关因素和牙齿状况会影响磨损行为，在为可摘义齿患者治疗时应予以考虑。
