摘要
目的:分析单侧咀嚼运动中工作侧、非工作侧接触面积的变化规律。方法:18例口颌系统功能正常的受试者用右侧咀嚼3 g口香糖。采用虚拟颅颌运动仿真系统模拟咀嚼运动,分析咀嚼循环闭口阶段4个时刻的接触面积,即:接触初、1/3时刻、2/3时刻、下颌位于牙尖交错位。结果:在工作侧,接触总面积从(9.3±0.4)mm2增至(39.2±1.2)mm2,第一磨牙的接触面积从(3.7±0.2)mm2增至(14.8±0.7)mm2,第二磨牙的接触面积从(3.5±0.2)mm2增至(13.9±0.4)mm2。在非工作侧,接触总面积从(2.3±0.5)mm2增至(40.3±1.2)mm2,第一磨牙的接触面积从(0.5±0.2)mm2增至(13.6±0.5)mm2,第二磨牙的接触面积从(1.2±0.3)mm2增至(12.1±0.5)mm2。此外,在接触初,18例受试者中有12例出现了非工作侧接触;至2/3时刻,所有受试者均出现了非工作侧接触。结论:提供了一种新的接触评价方法,可用于分析下颌功能运动中的接触;揭示了单侧咀嚼运动闭口阶段的接触模式,同时发现咀嚼运动中普遍存在非工作侧接触。
Objective：To analyze occlusal contact areas on the working and nonworking sides during unilateral mastication. Methods： Eighteen subjects without any temporomandibular disorder （TMD） symptoms participated in the present study. The subjects were presented with 3 g gum for right masticating. Chewing movement was simulated using virtual craniofacial movement simulation system. Then oeclusal contact areas were calculated at four selected moments during the closing phase in the third chewing cycle： the occurrence of occlusal contact, one third time, two thirds time, the intercuspal occlusion. Results： During the closing phase in the third chewing cycle, the total occlusal contact areas on working side increased from （ 9.3 ± 0. 4 ） mm2 to （ 39.2 ± 1.2 ） mm2, and that on nonworking side increased from （2. 3 ± 0. 5 ） mm2 to （40. 3 ± 1.2） mm2. At the occurrence of occlusal contacts, occlusal contact areas of the first and second mandibular molars were on average （ 3.7 ± 0.2 ） mm^2 and （ 3.5 ± 0.2） mm^2 on working side, and （0. 5 ±0. 2） mm^2 and （1.2 ±0.3） mmion nonworking side, respectively. However, when the mandible moved to the intercuspal position, their areas were sharply increased to （ 14.8 ± 0. 7 ） mm^2 and （ 13.9 ±0. 4 ） mm^2 on working side, and （ 13.6 ± 0.5 ） mm^2 and （ 12. 1 ± 0. 5 ） mm^2 on nonworking side, respectively. In addition, nonworking-side contacts were observed for 12 subjects at the occurrence of occlusal contacts, and for all subjects at two thirds time. Conclusion： This paper provides a new method useful for analyzing occlusal contacts during functional movements. This study revealed the pattern of occlusal contacts during the closing phase in the chewing cycle. Moreover, it was confirmed that nonworking-side contacts occurred during unilateral mastication.
出处
《北京大学学报（医学版）》
CAS
CSCD
北大核心
2009年第1期90-94,共5页
Journal of Peking University:Health Sciences
基金
国家高技术研究发展计划专项经费(2006AA01Z328)
国家自然科学基金(60673188
U0735004)资助~~
关键词
咀嚼
牙[牙合]
图像解释
计算机辅助
Mastication
Dental occlusion
Image interpretation, computer-assisted
