不同类型咬合板对髁突表面应力影响的比较

A study of five kinds of occlusal splints effect on the surface stress of condyle

目的比较5种咬合板对髁突表面应力的影响。方法利用下颌骨三维有限元模型,模拟5种咬合板的作用,观察髁状突表面22个区域应力变化情况。结果①前牙接触的咬合板中,髁突表面应力分布趋势基本相同,仅力值的大小不同。②前牙接触的咬合板可增加TMJ负荷;后牙接触的咬合板可降低TMJ负荷。③后牙接触的咬合板中,单侧枢轴咬合板在非工作侧髁突表面产生的负荷大于工作侧。结论引导下颌后移位的前牙斜面咬合板在髁突表面产生的负荷最大,临床应用时应特别谨慎,防止造成TMJ损伤。临床应用单侧枢轴咬合板治疗一侧TMD时,应把枢轴部分置于患侧;在诊断单侧TMD时,应注意患者是否有对侧偏侧咀嚼的习惯。

Objective To compare the mechanical conditions of condyle surface of TMJ under five kinds of occlusal splints. Methods On the basis of three dimensional finite element of mandible model, condyle surfaces stress changes were observed under five kinds of occlusal splints. Results Stress distribution tendencies on condyle surface were basically equal, but the amounts of stresses were different. Conclusion Condyle surface stress produced by five kinds splint was different. These results obtained from this study had paramount directory significance in clinical practice.