复合树脂修复II类牙腔不同放置技术及光固化单元微渗漏的体外研究

S. Miskin, C. Manduru, N. Sampathi, Upendranatha Reddy Nagireddy, Sujayeendranatha Reddy E, Sushma Chandra
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引用次数: 1

摘要

本研究的目的是通过体积填充技术,增量技术,向心技术,然后是聚合光源QTH和LED,评估用Tetetric n - ceram (TC)修复的II类腔的热循环后微泄漏评分。方法在牙合间隙上方1mm处制备常规的近闭牙(MO)牙槽。最后的准备有以下尺寸,3毫米-颊舌延伸1.5毫米-轴向深手4毫米-咬合-颈椎延伸。将样品进行蚀刻和冲洗,然后放置通用基质,然后涂上粘结剂并固化。随后将所有样品随机分为三组,每组20颗牙齿。组i -散装技术,组pii -倾斜铺设增量技术组iii -标本在37℃蒸馏水中保存,直至进行热循环。恒温循环500次,温度范围为5至55度,停留时间为20秒。标本沿修复体中远端方向的长轴用金刚石盘切片,由独立的检查者在10倍放大的立体显微镜下进行分析。三组龈缘微漏评分的Kruskal Wallis单因素方差分析比较。采用Mann-Whitney U检验对各组牙龈边缘微渗漏评分进行两两比较。采用SPSS STATISTICS 21.0软件进行统计学分析。三个实验组中微渗漏最少的是IIA亚组(IN-QTH),其次是IIIA亚组(CE-QTH),最后是IA亚组(B-QTH)。在所有组和亚组中,in - led (IIB亚组)微渗漏最少,B-QTH (IA亚组)微渗漏最高,有趣的是in - qth (IIA亚组)和CE-LED (IIIB亚组)之间无统计学差异。
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Evaluation of the microleakage in class II cavities restored with composite resin by using different placement techniques and light cure units– An in vitro study
The aim of the present study is to evaluatepost thermocycling microleakage scores in class II cavities restored with Tetetric n ceram (TC) by, Bulk fill technique, Incremental technique, Centripetal techniques, followed by polymerization light source QTH and LED.ethodsClass II Conventional Mesioocclusal (MO) cavities were prepared with occlusal gingival depth 1mm above the CEJ. The final preparation has the following dimensions, 3 mm – buccolingual extension1.5 mm –axial dept hand 4 mm –occluso-cervical extension. The samples will be etched and rinsed, and then the universal matrix will be placed after that the bonding agent will be applied and curedLater all specimens were randomly divided into three groups, each containing 20 teeth.GROUP I-Bulk Technique, GROUPII- Incremental Technique with oblique laying GROUP III-Specimens were stored in distilled water at 37C till it is subjected to thermocycling. Sthermo cycled for 500 cycles at with temperature range of 5 to 55 degrees with 20 seconds dwell time. Specimens were sectioned along the long axis in the mesiodistal direction of the restoration with a diamond disc and analyzed using a stereo microscope at 10x magnification by an independent examiner who was blinded by the groups.Comparison of three groups with microleakage scores at gingival margins by Kruskal Wallis one-way ANOVA test. Pair-wise comparison of all groups with respect to microleakage scores at gingival margins by Mann-Whitney U test. Statistical analysis was performed using SPSS STATISTICS 21.0 software.Among the three experimental groups least microleakage was seen with subgroup IIA (IN-QTH) followed by subgroup IIIA (CE-QTH) followed by subgroup IA (B-QTH).Among all these groups and subgroups, the least microleakage is seen in IN-LED (subgroup IIB), highest microleakage is seen in B-QTH (subgroup IA), interestingly there is no statistical difference between IN-QTH (subgroup IIA) and CE-LED (sub group IIIB).
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