【作者】 陈玉玲；

【导师】 张端强；

【作者基本信息】 福建医科大学 ， 口腔临床医学， 2006， 硕士

【摘要】 目的:初步研究金属托槽多次粘接前后生物机械学性能的变化,为探讨金属托槽多次粘接对临床矫治的影响提供实验依据。方法:通过观察两种不同种类的底板结构及粘接剂对金属托槽粘接强度的影响,选取粘接性能较优的托槽及粘接剂,采用高温灼烧后电解抛光的方法处理脱落的金属托槽,对托槽进行多次粘接,实验过程中模拟口腔内环境对试件进行人工唾液水浴,采用微机万能材料实验机对金属托槽多次粘接前后的粘接强度、摩擦力进行检测,同时辅以扫描电镜观察托槽底板及槽沟底金属表面结构的变化,并在扫描电镜下检测槽沟尺寸的大小,统计出槽沟相关指数的变化。结果:(1)底板结构对托槽的粘接强度有影响,网底托槽抗剪切强度与抗张强度均大于沟底托槽;底板结构与粘接剂的交互作用及粘接剂种类对托槽粘接强度影响无统计学意义。(2)金属托槽首次粘接的抗剪切强度与抗张强度度最大,随着粘接次数的增加,第二、三、四次粘接时其粘接强度均依次下降。(3)金属托槽多次粘接后,其托槽宽度逐渐减小,槽沟宽度逐渐增大、与此相应地,托槽入槽指数及托槽指数随之减小、托槽弓丝接触角随之增大。(4)随着粘接次数的增加,托槽槽沟底的金属表面结构磨损加剧,托槽与弓丝间的摩擦力增大,但无统计学意义。结论:网底托槽经微酸蚀处理后其粘接性能优于沟底托槽,网底托槽首次粘接的粘接强度最大,随着粘接次数的增加粘接强度逐渐减小,经过4次粘接后尽管托槽粘接强度显著降低,但仍能满足临床所需;电解抛光作用所致托槽槽沟尺寸的变化及其引起的槽沟相关指数的变化,虽然有利于弓丝在槽沟内的启动、但不利于托槽弓丝间的滑动;槽沟磨损加剧导致的摩擦力增大也不利于托槽弓丝间的滑动,对临床矫治效率及效果均会带来负面影响,因此,不建议临床上反复使用托槽。更多还原

【Abstract】 Objective: The purpose of this study was to observe the biomechanics of metallic orthodontic bracket during multiple bonding. Methods: Investigate the influence of two diffrent base designs and adhesives on the bond strength of metallic orthodontic bracket. Then select the better bracket and adhesive to the multiple bonding, the dislodged brackets were recycled by thermal treatment and electropolishing. The bonding brackets were exposed to artificial saliva to mimic the true situation. The bond strength and the friction were tested by the tester. Observe the change of the bracket base and the slot base by using SEM, with whose help the slot size were tested and then the statistics of the slot related indexes were made. Results: The shearing bond strength and the tensil bond strength of simple foil mesh bracket were both greater than horizontal retention groove base bracket. The adhesive factor and the interaction between the base and the adhesive had little effect on the bond strength of bracket. During the test of multiple bonding, the fist bond strength was greast, with the times of bonding increased, the bond strength significantly decreased; the slot size became wider, the bracket width became shorter, the bracket index and the bracket engage index decreased, the critical contact angle increased; the base of the slot became more wearing, the friction between the bracket and the are wire increased. Conclusions: The bond strength of simple foil mesh bracket with micro-etch base is greater than horizontal retention groove base bracket. The bond strength of the metallic orthodontic bracket significantly decreased with the times of bonding increased, but the bond strength can still be clinic available after 4 times bonding. The更多还原