Hatibovic-Kofman S, Wright G Z, Braverman I
University of Western Ontario, London, Canada.
Pediatr Dent. 1998 May-Jun;20(3):173-6.
The aim of this study was to compare the microleakage of unfilled and filled sealants after conventional, bur, and air-abrasion tooth preparation.
Seventy-two extracted molars were randomly divided into three groups. In group 1, 24 teeth were prepared by pumicing and acid etching with 37% phosphoric acid. In group 2, 24 teeth were prepared with a 1/4-round bur in a low-speed handpiece and then acid etched. In group 3, 24 teeth were prepared by high-speed (160 PSI) microabrasion using 50 mu alpha alumina particles in a KCP 2000 machine. In each group, 12 teeth were sealed with a filled sealant and 12 teeth with an unfilled sealant. All the teeth were stored in artificial saliva for 7 days and thermocycled for 2000 cycles. Teeth were then sealed apically and coated with nail varnish 1 mm from the margins and stained in 1% methylene blue for 24 h. Each tooth was sectioned in three locations and ranked (0-3) for microleakage.
There were 216 sections and 66% showed no leakage.
Chi-square statistical analysis of the data led to the following conclusions: 1) superior results were obtained when the tooth surfaces were prepared by a bur, 2) conventionally and KCP 2000-prepared tooth surfaces yielded similar results, and 3) the unfilled sealant was superior to the filled sealant.
本研究的目的是比较在传统、使用牙钻和空气喷砂进行牙齿预备后，未填充和填充封闭剂的微渗漏情况。
72颗拔除的磨牙随机分为三组。第1组，24颗牙齿通过打磨和用37%磷酸酸蚀进行预备。第2组，24颗牙齿用低速手机中的1/4圆形牙钻进行预备，然后酸蚀。第3组，24颗牙齿在KCP 2000机器中使用50μm的α氧化铝颗粒通过高速（160 PSI）微喷砂进行预备。每组中，12颗牙齿用填充封闭剂密封，12颗牙齿用未填充封闭剂密封。所有牙齿在人工唾液中储存7天，并进行2000次热循环。然后将牙齿根尖密封，在距边缘1 mm处涂指甲油，在1%亚甲蓝中染色24小时。每颗牙齿在三个位置切片，并对微渗漏进行评分（0 - 3）。
共216个切片，66%无渗漏。
对数据进行卡方统计分析得出以下结论：1）用牙钻预备牙齿表面时效果更佳；2）传统方法和KCP 2000预备的牙齿表面产生相似的结果；3）未填充封闭剂优于填充封闭剂。
