Soleymani Aliasghar, Bahrololoomi Zahra, Javadinejadi Shahrzad, Salehi Parisa
Assistant Professor, Department of Pediatric dentistry, Faculty of Dentistry, Shahid Sadoughi University of Medical Sciences, Yazd, Iran.
Associate Professor Department of Pediatric dentistry, Faculty of Dentistry, Shahid Sadoughi University of Medical Sciences, Yazd, Iran.
J Dent (Tehran). 2014 Nov;11(6):639-43. Epub 2014 Nov 30.
Micro-leakage, one of the major reasons for recurrent decays, may lead to uncontrollable flow of liquids, pulp inflammation and peri-apical pathology. The purpose of this in vitro study was to evaluate micro-leakage of pit and fissure sealants after using three different pit and fissure preparation techniques: 1) acid etching, 2) fissure enameloplasty and acid etching, and 3) air abrasion and acid etching.
Sixty-nine extracted sound molars and premolars were randomly divided into three groups (23 samples in each group). Teeth were prepared using one of three occlusal surface treatments. Then the sealant was applied on the occlusal fissures of all teeth. The teeth were thermocycled and stored in normal saline. All teeth were sealed apically and coated with nail varnish and then were immersed in a 2% solution of methylen blue. Two buccolingual sections were made. The surfaces were scored 0 to 3 for the extent of micro-leakage using a stereomicroscope. Data were analyzed by Kruskal- wallis and Dunn procedure.
Enameloplasty and acid etching were significantly different regarding micro-leakage (P= 0.016), but no significant difference in micro-leakage was observed between air abrasion and the other methods.
Enameloplasty followed by acid etching produced significantly less micro-leakage than the acid etching technique. Air abrasion acid etching was better than the acid etching technique in reducing micro-leakage too.
微渗漏是龋病复发的主要原因之一，可能导致液体无法控制地流动、牙髓炎症和根尖周病变。本体外研究的目的是评估使用三种不同的窝沟预备技术后窝沟封闭剂的微渗漏情况：1）酸蚀；2）沟裂釉质成形术加酸蚀；3）空气喷砂加酸蚀。
69颗拔除的健康磨牙和前磨牙随机分为三组（每组23个样本）。使用三种咬合面处理方法之一对牙齿进行预备。然后将封闭剂应用于所有牙齿的咬合沟裂。对牙齿进行热循环处理并保存在生理盐水中。所有牙齿根尖封闭，涂指甲油，然后浸泡在2%的亚甲蓝溶液中。制作两个颊舌向切片。使用体视显微镜根据微渗漏程度将表面评分为0至3分。数据采用Kruskal-Wallis和Dunn检验进行分析。
在微渗漏方面，釉质成形术加酸蚀与其他方法有显著差异（P = 0.016），但空气喷砂与其他方法之间在微渗漏方面未观察到显著差异。
釉质成形术加酸蚀产生的微渗漏明显少于单纯酸蚀技术。空气喷砂加酸蚀在减少微渗漏方面也优于酸蚀技术。
