First molar cross-bite is more closely associated with a reverse chewing cycle than anterior or pre-molar cross-bite during mastication.
First molar cross-bite is more closely associated with a reverse chewing cycle than anterior or pre-molar cross-bite during mastication.
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DOI：
10.1111/joor.12222
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发表时间：
2014-08
影响因子：
2.9
通讯作者：
H. Tomonari;T. Ikemori;T. Kubota;S. Uehara;S. Miyawaki
中科院分区：
文献类型：
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作者：
H. Tomonari;T. Ikemori;T. Kubota;S. Uehara;S. Miyawaki
后牙反是指正中牙合时，对侧磨牙、前磨牙或两者间的颊舌关系异常。虽然据报道，单侧后牙反牙合患者往往表现出独特的咀嚼模式，反牙合的形式和咀嚼下颌运动之间的关系仍然不清楚在成年患者。本研究的目的是探讨咀嚼颌骨运动之间的不同形式的反。101名成年人参加了这项研究：27名单侧第一磨牙反（MC组）; 28名单侧前磨牙反（PC组）; 23名前牙反（AC组）; 23名正常牙合（对照组）。应用六自由度下颌运动跟踪系统记录单侧咀嚼时下颌切牙点的咀嚼运动。结果表明，在刻意偏侧咀嚼时，MC组的反向咀嚼率显著大于PA组（P < 0.001）、AC组（P < 0.001）和对照组（P < 0.001）。这些研究结果表明，与前磨牙或前磨牙反牙合相比，第一磨牙反牙合与更高的反向咀嚼周期患病率更密切相关。
A posterior cross-bite is defined as an abnormal bucco-lingual relationship between opposing molars, pre-molars or both in centric occlusion. Although it has been reported that patients with unilateral posterior cross-bite often show unique chewing patterns, the relationship between the form of cross-bite and masticatory jaw movement remains unclear in adult patients. The objective of this study was to investigate masticatory jaw movement among different forms of cross-bite. One hundred and one adults were recruited in this study: 27 had unilateral first molar cross-bite (MC group); 28, unilateral pre-molar cross-bite (PC group); 23, anterior cross-bite (AC group); and 23, normal occlusion (control group). Masticatory jaw movement of the lower incisor point was recorded with six degrees of freedom jaw-tracking system during unilateral mastication. Our results showed that the reverse chewing ratio during deliberate unilateral mastication was significantly larger in the MC group than in the PA (P < 0.001), AC (P < 0.001) and control (P < 0.001) groups. These findings suggest that compared to the anterior or pre-molar cross-bite, the first molar cross-bite is more closely associated with a higher prevalence of a reverse chewing cycle.