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玷污层及不同根尖倒充填材料对根尖倒充填后微渗漏影响的体外研究

2015-10-21李永立等

医学美学美容·中旬刊 2015年2期

李永立等

【摘要】目的:探讨对应用3种根管倒充填材料玷污层去留对根尖微渗漏的影响,以期为临床应用提供依据。方法: 选取64颗单根管牙,常规根管预备后,冷牙胶侧向加压充填根管,根尖切除后进行根管倒预备,将其随机分为实验组与对照组( 每组各32 颗)。实验组:17%EDTA +2%氯亚明去除玷污层,对照组:用5mL生理盐水冲洗。从2组中随机抽取2颗牙做扫面电镜检测。各组分别用MTA、GIC和HG进行倒充填。去除根管上段充填物,将离体牙置于微渗漏模型, 于第1、2、4、7、10、15、20和3 0 天检测从冠方向根方漏出的葡萄糖的浓度。结果: MTA的封闭性在各个时间点均优于GIC、HG。离体牙同一种处理方法(去除或保留)下不同倒充填材料两两相比,均有统计学差异(P<0.05)。同一种倒充填材料在去除与保留玷污层处理中,MTA 、GIC去除玷污层在各个时间点的葡萄糖渗出浓度均低于保留玷污层,而用HG行倒充填则无统计学差异 ( P>0.05)。结论:MTA的根尖封闭性优于GIC、HG,应用MTA、GIC作为根尖倒充填材料去除玷污层后根尖封闭性更好,而HG没有差异。

【关键词】根尖倒充术;玷污层; 葡萄糖氧化酶法;扫描电镜

【Abstract】Objective:Affect apical microleakage after filling material with the smear layer on the application of three root canal. Method: Select 64 single root canal teeth after root canal preparation, cold lateral condensation gutta-percha root canal filling, after removal of the apical root canal preparation down. Randomly divided into experimental group and control group (n = 30 each). Experimental group: 17%EDTA +1% chloramine-T remove the smear layer, In the control group: 5ml saline. Randomly selected from two groups do SEM observation. Each group was randomly divided into 3 groups were MTA, GIC, HG were down filling, taking root canal filling the upper section. Placing micro-leakage model.First detected in concentrations ranging from 0 days 1,2,4,7,10,15,20,30 crown direction leaked square root of glucose. Results: MTA's closure at each time point were superior GIC, HG. Different back molars same treatment (removal or retention) under the filling material compared pairwise differences were statistically significant P <0. 05). With a filling material in the smear layer removal and retention process, MTA, GIC remove the smear layer and MTA, GIC retain glucose smear layer at each time point oozing concentrations were lower than retain the smear layer, HG compared to tarnish the removal or retention layer was no significant difference (P> 0. 05). Conclusion:MTA apical closure than GIC, HG, application MTA, GIC as a retrograde filling material after removal of the smear layer apical sealing better, but no difference in HG.

【key words 】Retrograde filling technique; Smear layer; Glucose oxidase; SEM.

【中圖分类号】R781.05 【文献标识码】B【文章编号】1004-4949(2015)02-0009-01

根管治疗术(RCT)是治疗牙髓病及根尖周病首选的方法,虽然目前根管治疗术的适应证逐渐扩大,但现在常规根管治疗仍然有一些难以治愈的患牙,常需配合根尖外科手术进行治疗,其中目的是去除根尖区病灶,并获得良好的根尖封闭性,从而防止微渗漏的发生。评价根尖外科手术是否成功的最重要的指标就是根尖微渗漏[1]。根管充填材料与根管壁之间以及充填材料与充填材料之间出现的间隙导致根管内的细菌及细菌产物到达根尖区[1],是引起根尖手术失败常见原因之一。……

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