Department of Pediatric Dentistry, School of Dentistry, Tehran University of Medical Sciences, Tehran, Iran.
Department of Restorative Dentistry, School of Dentistry, Kashan University of Medical Sciences, Kashan, Iran.
Clin Exp Dent Res. 2023 Jun;9(3):512-517. doi: 10.1002/cre2.729. Epub 2023 Mar 29.
This study assessed the enamel and dentin margin microleakage of class II cavities of primary molars restored with a bulk-fill and a conventional composite.
In this in vitro, experimental study, standard class II cavities were created in the proximal surfaces of 60 extracted primary molars. The teeth were randomly divided into two groups, and restored with SonicFill bulk-fill and Filtek Z250 conventional composite along with Single Bond 2 adhesive. The teeth were coated with two layers of nail varnish to 1 mm around the restoration margins, and the apices were sealed with wax. The teeth underwent 1500 thermal cycles and incubated at 37°C for 24 h. They were then immersed in 1 M silver nitrate in the dark, rinsed with water, immersed in developing solution for 12 h, and exposed to fluorescent light. Next, they were mesiodistally sectioned, and digitally photographed under a stereomicroscope at ×10 magnification. The dye penetration depth was measured by a blind observer, and analyzed by the Mann-Whitney U test (α = .05).
No significant difference existed in microleakage between the two composite groups at the enamel (p = .76) or dentin (p = .16) margins. In both composite groups, microleakage at the dentin margins was significantly greater than that at the enamel margins (p = .000).
Considering the absence of a significant difference in microleakage, SonicFill bulk-fill composite can be used as an alternative to Filtek Z250 conventional composite for restoration of primary molars to benefit from its advantages such as simpler and faster application.
本研究评估了用大体积充填和传统复合树脂修复乳磨牙Ⅱ类洞时的釉质和牙本质边缘微渗漏。
在这项体外实验研究中，在 60 颗离体乳磨牙的近中面制备了标准的Ⅱ类洞。将牙齿随机分为两组，分别用 SonicFill 大体积充填和 Filtek Z250 传统复合树脂以及 Single Bond 2 粘结剂进行修复。用两层指甲油将牙齿边缘的修复体周围涂 1mm，并将牙尖用蜡密封。牙齿经过 1500 次热循环，在 37°C 下孵育 24 小时。然后将它们浸入黑暗中的 1M 硝酸银中，用清水冲洗，在显色液中浸泡 12 小时，然后暴露在荧光灯下。然后将牙齿沿近远中方向切割，在立体显微镜下以 ×10 放大倍数拍照。用盲法观察者测量染料渗透深度，并采用曼-惠特尼 U 检验（α=0.05）进行分析。
在釉质（p=0.76）或牙本质（p=0.16）边缘，两种复合树脂之间的微渗漏无显著差异。在两种复合树脂组中，牙本质边缘的微渗漏明显大于釉质边缘（p=0.000）。
考虑到微渗漏无显著差异，SonicFill 大体积充填复合树脂可以替代 Filtek Z250 传统复合树脂用于乳磨牙的修复，以受益于其操作更简单、更快的优点。
