Plotnick I J, Beresin V E, Simkins A B
J Prosthet Dent. 1975 Apr;33(4):403-6. doi: 10.1016/s0022-3913(75)80036-9.
Distal-extension lower removable partial dentures were used to study the effects of various types of opposing dentitions on the residual mandibular ridge. The opposing-dentition groups included complete upper dentures, removable partial upper dentures, and natural teeth. Changes in the bone of the lower residual ridge were measured by means of densitometry. A significant densitometric difference was found in the bone of the partially edentulous mandible between the group of subjects wearing complete upper dentures and the group with natural upper teeth. The reason for this difference is uncertain; however, several theories can be offered. These are (1) an inherent bone difference between the subjects in the two groups, implying a difference in the bone of the group that retained their natural upper teeth longer than did the complete denture group, (2) an increased frequency and/or duration of muscle pull on the mandible due to clenching of the teeth to stabilize the upper complete denture, and (3) the possibility of coincidence. None of the densitometric changes measured at +18 months was significant.
使用远中游离端下颌可摘局部义齿来研究不同类型的对颌牙列对剩余下颌牙槽嵴的影响。对颌牙列组包括全口上颌义齿、可摘局部上颌义齿和天然牙。通过骨密度测定法测量下颌剩余牙槽嵴骨的变化。发现在佩戴全口上颌义齿的受试者组和天然上颌牙受试者组之间，部分无牙下颌骨的骨密度存在显著差异。这种差异的原因尚不确定；然而，可以提出几种理论。这些理论是：（1）两组受试者之间存在内在的骨差异，这意味着保留天然上颌牙时间比全口义齿组更长的那组受试者的骨存在差异；（2）由于咬紧牙齿以稳定上颌全口义齿，导致下颌肌肉牵拉的频率和/或持续时间增加；（3）巧合的可能性。在18个月时测量的骨密度变化均无显著意义。
