3种大块后牙充填树脂体外操作时间与微渗漏的对比观察

Comparative observation of in vitro microleakage and operation time after the three kinds of latter teeth filled with chunks of resin

目的以传统分层充填树脂为对照比较3种大块充填后牙树脂体外充填所用时间及微渗漏的情况。方法选取符合纳入标准的第三磨牙40颗于面统一制备4 mm×4 mm×4 mm的Ⅰ类洞,随机分成A、B、C、D四组,分别用Sonic Fill超声充填树脂,Sure Fil SDR整层充填流动树脂,Tetric N-Ceram bulk Fill大块充填树脂,Filtek Z350后牙树脂充填,记录每次充填完成的时间,充填样本经冷热循环实验后置于印度墨水中浸泡24 h,干燥后沿样本近远中向剖开,于体视显微镜下观察样本染料渗入深度,并测量计数,进行统计学分析。结果四组操作时间的差异比较,A、B组差异无统计学意义(P>0.05),其余各组两两比较差异均有统计学意义(P<0.05),C组耗时最少,传统分层充填D组耗时最多。四组微渗漏均有发生,数值差异无统计学意义(P>0.05)。结论 3种后牙大块充填树脂均可达到与传统分层充填相同的边缘封闭性,且较后者操作时间短,操作简单。

Objective Taking traditional layering dental resin as a contrast to compare in vitro microleakage and operation time of the three types of latter teeth filled with chunks of resin. Methods 40 unified in vitro molars were selected, in facies occlusalis of tooth preparation 4 mm×4 mm×4 mm hole of class I , then were randomly divided into A, B, C, D four groups The four groups were filled with SonicFill resin, SureFil SDR flowable resin, Tetric N-Ceram bulk Fill resin, Filtek Z350 resin filling, and each sample filling time of completion was recorded. After the thermal cycle test, the filling samples were put into India ink soak for 24h. After drying the sample was cut along the mesial and distal . Sample dye penetration depth was stereoscopically viewed under a microscope, and then counted and measured and analyzed statistically. Results The operation time difference of four groups ： there were no significant differ- ences between group A and B P = 0.791（P〉0.05） ;the rest of the pairwise comparison were significant differences P=0.000（P〈0.05） ; C group consumed the least, while traditional layering D group consumed the most. Micro-leakage occurred in four groups, but four groups had no significant differences P= 0.727（P〉0.05）. Conclusion The three kinds of latter teeth filled with chunks of resin can a- chieve the same edge of the closed nature compared with conventional layering and its operating time is shorter than the latter, easy to operate.