Mohamed Nada Ismail, Safy Rehab Khalil, Elezz Ahmed Fawzy Abo
Restorative Dentistry Department, Faculty of Dentistry, Suez Canal University, Ismalia, Egypt.
Eur J Dent. 2021 Jul;15(3):425-432. doi: 10.1055/s-0040-1721310. Epub 2020 Dec 26.
This study aimed to investigate the microtensile bond strength (µTBS), microleakage, and antibacterial effect of bulk fill resin composite with alkaline fillers (alkasite) (alkaline fillers such as barium aluminum silicate glass and ytterbium trifluoride) in comparison to incremental nanohybrid resin composite.
µTBS was evaluated by using 30 human mandibular molars. Teeth were randomly divided into three groups (C): nanohybrid resin composite (C0), self-cured alkasite (C1), and dual-cured alkasite (C2). Each group was subdivided into two subgroups according to the bulk thickness: 4 mm (T1) and 6 mm (T2). The occlusal enamel of teeth was removed and the resin composite was applied to a flat dentin surface. Then, teeth were sectioned into beams to be tested under tension. For microleakage testing, mesio-occlusal class II cavities were prepared in 15 molars and divided into three groups as mentioned before. Following this, cavities were restored, thermocycled, immersed in a dye, sectioned mesiodistally, and then dye penetration was assessed. The antibacterial effect of both tested materials was evaluated using agar disc diffusion and broth dilution methods against chlorhexidine as a control positive group.
There was no significant difference in µTBS between all tested groups. Bulk fill self-cured alkasite showed the lowest microleakage value followed by bulk fill dual-cured alkasite and incremental nanohybrid resin composite, respectively. Also, cervical microleakage showed significantly higher mean value than the occlusal one. The antibacterial effect of alkasite was less than chlorhexidine. Alkasite showed maximum broth clarity at lowest tested bacterial concentration.
Resin composite with alkaline fillers was characterized by good µTBS and marginal integrity with weak antibacterial effect.
本研究旨在调查与传统纳米混合树脂复合材料相比，含碱性填料（碱式玻璃）（如硅酸钡铝玻璃和三氟化镱等碱性填料）的大块充填树脂复合材料的微拉伸粘结强度（µTBS）、微渗漏及抗菌效果。
使用30颗人类下颌磨牙评估µTBS。牙齿随机分为三组（C）：纳米混合树脂复合材料（C0）、自固化碱式玻璃（C1）和双重固化碱式玻璃（C2）。根据充填厚度，每组再细分为两个亚组：4mm（T1）和6mm（T2）。去除牙齿的咬合面釉质，将树脂复合材料应用于平坦的牙本质表面。然后，将牙齿切成梁状以进行拉伸测试。对于微渗漏测试，在15颗磨牙上制备近中-咬合面II类洞，并按上述方法分为三组。之后，修复窝洞，进行热循环，浸入染料中，近远中向切片，然后评估染料渗透情况。使用琼脂扩散法和肉汤稀释法评估两种测试材料对作为对照阳性组的洗必泰的抗菌效果。
所有测试组之间的µTBS无显著差异。大块充填自固化碱式玻璃的微渗漏值最低，其次分别是大块充填双重固化碱式玻璃和传统纳米混合树脂复合材料。此外，颈部微渗漏的平均值显著高于咬合面微渗漏。碱式玻璃的抗菌效果低于洗必泰。在最低测试细菌浓度下，碱式玻璃显示出最大的肉汤透明度。
含碱性填料的树脂复合材料具有良好的µTBS和边缘完整性，但抗菌效果较弱。
