Craddock H L
Division of Restorative Dentistry, Leeds Dental Institute, The Worsley Building, Clarendon Way, Leeds, UK.
J Oral Rehabil. 2007 Apr;34(4):246-50. doi: 10.1111/j.1365-2842.2007.01686.x.
The need and demand for replacement of missing posterior teeth may increase as the UK population is predicted to be at least partially dentate for life. Replacement with either fixed or removable prostheses may be indicated, and the tooth positional changes of adjacent or opposing teeth may require consideration. The objectives of this study are to: (1) Investigate the extent of overeruption associated with partially opposed posterior teeth; (2) Determine if overeruption is associated with tipping of the partially opposed tooth and examine the extent of tip. Ninety-one patients with either partially or completely unopposed posterior teeth were included in the study. For each group the extent of overeruption of the tooth was measured. Differences in the extent of overeruption and tipping were analysed. Correlations between the presence of partial tooth contact and the extent of overeruption and degree of tipping of the unopposed tooth were analysed. There was no significant difference in the extent of overeruption between the unopposed and partially opposed groups. The partially opposed teeth displayed a greater degree of tipping than the unopposed group. There was no significant correlation between the extent of overeruption and the degree of tipping, nor between the extent of overeruption and the presence of partial tooth contact. There was, a significant correlation between the degree of tooth tip and the presence of partial tooth contact. (1) Partial tooth contact does not appear to prevent or reduce overeruption; (2) Partially opposed teeth show an increased degree of tip relative to teeth with complete lack of occlusal contact. The findings suggest that partial tooth contact should not be relied on clinically to maintain vertical tooth position.
由于预计英国人口一生中至少部分牙齿有牙列，所以对缺失后牙进行修复的需求可能会增加。可能需要采用固定或可摘义齿进行修复，并且可能需要考虑相邻或对颌牙齿的位置变化。本研究的目的是：（1）调查与部分对颌后牙相关的过度萌出程度；（2）确定过度萌出是否与部分对颌牙齿的倾斜有关，并检查倾斜程度。91例有部分或完全无对颌后牙的患者纳入本研究。对每组牙齿的过度萌出程度进行测量。分析过度萌出程度和倾斜程度的差异。分析部分牙齿接触的存在与过度萌出程度和无对颌牙齿倾斜程度之间的相关性。无对颌组和部分对颌组之间的过度萌出程度无显著差异。部分对颌牙齿的倾斜程度大于无对颌组。过度萌出程度与倾斜程度之间、过度萌出程度与部分牙齿接触的存在之间均无显著相关性。牙齿倾斜程度与部分牙齿接触的存在之间存在显著相关性。（1）部分牙齿接触似乎不能防止或减少过度萌出；（2）相对于完全缺乏咬合接触的牙齿，部分对颌牙齿的倾斜程度增加。研究结果表明，临床上不应依赖部分牙齿接触来维持牙齿的垂直位置。
