Functional tooth mobility in young pigs.
Functional tooth mobility in young pigs.
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DOI：
10.1016/j.jbiomech.2020.109716
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发表时间：
2020-05-07
影响因子：
2.4
通讯作者：
Liu ZJ
中科院分区：
文献类型：
--
作者：
Salamati A;Chen J;Herring SW;Liu ZJ
活动度是哺乳动物牙齿的基本特征，已被广泛用于确定个体牙齿预后。然而，功能负荷下牙齿移动的方向和程度是未知的。本研究旨在探讨年轻猪在咀嚼和咬肌收缩过程中上颌磨牙移动、牙槽弯曲和牙周间隙（PDL）流体压力，沿着测量PDL间隙。12只3月龄的农场猪被植入以下部分或全部：（1）超声波晶体，一个植入到乳上颌磨牙的髓室中，另外的晶体粘在其颊侧和腭侧牙槽板上;（2）玫瑰花形应变计固定在牙槽嵴的颊侧和腭侧;（3）压力传感器插入到面向PDL的腭侧牙槽骨中。牙齿的流动性，牙槽弯曲，和流体压力同时记录在无限制的喂养和随后的咬肌刺激。使用micro-CT测量PDL宽度。结果表明：（1）在动力咀嚼过程中，磨牙向颊侧和向根尖侧位移（192 ± 95 μm），颊侧牙槽骨压应变大于腭侧牙槽骨压应变，牙周膜压力在动力咀嚼过程中增加（3.63 ± 0.80 kPa）。咬肌收缩产生了类似的结果，但一般较低的值。牙周膜宽度大于牙齿活动度范围，与牙齿活动度无相关性。因此，咬合功能导致颊侧倾斜和上颌磨牙的侵入，伴随着颊侧牙槽板的压缩和PDL空间内的压力升高。
Mobility is a fundamental characteristic of mammalian teeth, and has been widely used to determine individual tooth prognosis. However, the direction and extent of tooth movement under functional loads are unknown. This study investigated maxillary molar mobility, alveolar bending, and periodontal space (PDL) fluid pressure during mastication and masseter muscle contraction in young pigs, along with PDL space measurements. Twelve three-month-old farm pigs were instrumented with some or all of the following: (1) ultrasonic crystals, one implanted into the pulp chamber of a deciduous maxillary molar and additional crystals glued onto its buccal and palatal alveolar plates; (2) rosette strain gauges affixed to the buccal and palatal of alveolar ridges; (3) a pressure transducer inserted into palatal alveolar bone facing the PDL. Tooth mobility, alveolar bending, and fluid pressure were simultaneously recorded during unrestrained feeding and subsequent masseter muscle stimulation. The PDL widths were measured using micro-CT. The results indicate that during the power stroke of mastication, (1) the molar displaced buccally and apically (192 ± 95 μm) regardless of the side of chewing; (2) compressive bone strain was greater on the buccal than on the palatal alveolar plate; and (3) PDL pressure increased during the power strok (3.63 ± 0.80 kPa). Masseter contraction produced similar results but with generally lower values. The PDL widths were larger than the range of tooth mobility, and showed no correlation with the mobility. Thus occlusal function causes buccal tipping and intrusion of maxillary molars with concomitant compression of the buccal alveolar plate and raised pressure within the PDL space.
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影响因子：
3.9
作者：
Chang CH;Lei YN;Ho YH;Sung YH;Lin TS
通讯作者：
Lin TS
影响因子：
3.4
作者：
Konermann, Anna;Al-Malat, R.;Jaeger, A.
通讯作者：
Jaeger, A.
影响因子：
3.4
作者：
Gonzales, Carmen;Hotokezaka, Hitoshi;Yoshida, Noriaki
通讯作者：
Yoshida, Noriaki
影响因子：
3
作者：
Yeh, K.;Popowics, T.;Rafferty, K.;Herring, S.;Egbert, M.
通讯作者：
Egbert, M.
影响因子：
4.3
作者：
KALKWARF, KL;KREJCI, RF
通讯作者：
KREJCI, RF