Moxham B J, Berkovitz B K, Shore R C, Spence J A
Res Vet Sci. 1987 Jan;42(1):61-4.
Linguolabially directed loads of 0.01 to 1.0 N were applied to a mandibular central incisor in each of 12 four-year-old ewes with healthy mouths. For each incisor, tooth position was monitored continuously with an ultrasonic displacement transducer. On suddenly applying a load and maintaining it for five minutes, a biphasic pattern of displacement was recorded, a phase of rapid displacement being followed by a more gradual one. A similar biphasic recovery response was seen on suddenly removing the load. These patterns are viscoelastic-like. The group mean displacements showed that for all phases the responses were force-dependent, though not linearly graded. For a given load, the group mean displacements were considerably larger than those reported previously for the teeth of other animals, supporting the impression that the sheep incisor is extremely mobile. These data will provide a baseline for studies on the mobility of the teeth of sheep with inflammatory periodontal disease ('broken mouth').
对12只口腔健康的4岁母羊的每只下颌中切牙施加0.01至1.0 N的唇舌向负荷。对于每颗切牙，用超声位移传感器连续监测牙齿位置。在突然施加负荷并保持5分钟时，记录到位移的双相模式，即快速位移阶段后跟着一个更逐渐的阶段。在突然去除负荷时也观察到类似的双相恢复反应。这些模式类似粘弹性。组平均位移表明，在所有阶段，反应都依赖于力，尽管不是线性分级的。对于给定的负荷，组平均位移比先前报道的其他动物牙齿的位移大得多，这支持了绵羊切牙非常活动的印象。这些数据将为研究患有炎症性牙周病（“破口”）的绵羊牙齿的活动度提供基线。
