摘要
目的：从力学角度研究磁性附着体能否对基牙起到保护作用。方法：用材料力学试验机测得磁体与支撑板之间最大静摩擦力，经公式计算得到磁性附着体固位的下颌全口覆盖义齿基牙所受侧向力值为２．４９～４．０６Ｎ；用三维有限元法计算和分析侧向载荷为４．４１Ｎ时，基牙牙根周围牙槽骨的应力分布情况。结果：在侧向载荷下，基牙根周牙槽骨内各个层面的应力值较小且主要为压应力；在相同的侧向载荷下，基牙牙根长度的不同对基牙根周牙槽骨内的应力分布和最大压应力值无明显影响。结论：ＭｅｇｆｉｔＥＸ６００磁性附着体用于下颌全口覆盖义齿，可有效避免对基牙产生的侧向力，对基牙具有保护作用。
Objective: To determine whether magnetic attachments can protect the abutment tooth from the aspect of the mechanics analysis. Methods: The lateral forces exerted on the abutment of magnetically retained mandibular complete overdenture were measured and calculated. The mean values of the lateral forces ranged from 2.49～4.06 N. Three dimensional finite element method was used to calculate the stresses in the supporting tissue of the abutment when a lateral load of 4.41 N was exerted directly on the attached surface of the keeper. Results: The minimum principal stresses in the alveolar bone around the abutment root were small. As the height of the bone around the abutment roots decreased, the magnitude and distribution pattern of the stress had no significant change. Conclusion: Megfit EX 600 magnetic attachments can avoid injurious lateral forces exerted on the abutment tooth, and protect the abutment tooth.
出处
《北京医科大学学报》
CSCD
1999年第4期360-362,共3页
Journal of Peking University(Health Sciences)
基金
国家教委博士点基金
关键词
磁性附着体
义齿
义齿固位
载荷
应力分布
Magnetic attachment ☆
Denture
complete
lower
Denture retention
