Contributing factors of mandibular deformation during mouth opening

B. C. Chen, Y. L. Lai, L. Y. Chi, S. Y. Lee*


研究成果: Article同行評審

40 引文 斯高帕斯(Scopus)


Objectives: A decrease in mandibular arch width during forced opening has been documented. However, the contributing factors of mandibular deformations are still unclear. This study investigated the mandibular deformation during mouth opening, and searched for contributing factors related to this phenomenon. Methods: Sixty-two dental students volunteered for this study. A linear variable differential transducer (LVDT) was cemented on the mandibular first molars to record mandibular deformation during mouth opening. Proposed factors including geometric factors of the mandible such as lower gonial angle, mandibular length, symphyseal width and height were measured from cephalometric analysis. Densitometric analysis was performed to detect symphyseal area and bone density. Results: The changes in width between the mandibular first molars ranged from 20 to 437 fjun, which was negatively correlated to the symphyseal width, area, and bone density. Where the lower gonial angle had a positive influence, the arch width changed during mouth opening. A multifactorial model showed a significant correlation between the set of predictor variables (symphyseal area, bone density, and mandibular length) and mandibular deformation. Conclusions: Mandibular arch width narrowed during forced opening. Subjects with smaller symphysis, lower bone density and longer mandible tend to have larger arch width changes.

頁(從 - 到)583-588
期刊Journal of Dentistry
出版狀態Published - 11月 2000


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