Department of Conservative and Preventive Dentistry, Center for Dental Medicine, University of Zurich, Plattenstrasse 11, Zurich, Switzerland.
Department of Endodontics and Restorative Dentistry, School of Dental Medicine, University of Zagreb, Gunduliceva 5, Zagreb, Croatia.
Clin Oral Investig. 2024 Jul 16;28(8):430. doi: 10.1007/s00784-024-05824-x.
This in vitro study examined the marginal integrity of experimental composite materials doped with bioactive glass (BG).
Class-II MOD cavities were prepared and restored with one of the following composite materials: a commercial composite material as a reference (Filtek Supreme XTE), an experimental composite doped with BG 45S5 (C-20), and an experimental composite doped with a fluoride-containing BG (F-20). Six experimental groups (n = 8) were used, as each of the three composites was applied with (+) or without (-) a universal adhesive (Adper Scotchbond Multipurpose). All specimens were subjected to thermocycling (10,000 x, 5-55 °C) and then additionally stored in artificial saliva for eight weeks. Scanning electron micrographs of the mesial and the distal box were taken at three time points (initial, after thermocycling, and after eight weeks of storage in artificial saliva). The margins were classified as "continuous" and "non-continuous" and the percentage of continuous margins (PCM) was statistically analyzed (α = 0.05).
In most experimental groups, thermocycling led to a significant decrease in PCM, while the additional 8-week aging had no significant effect. F-20 + performed significantly better (p = 0.005) after 8 weeks storage in artificial saliva than the reference material with adhesive, while no statistically significant differences were observed at the other two time points. C-20 + exhibited significantly better PCM than the reference material with adhesive after thermocycling (p = 0.026) and after 8 weeks (p = 0.003).
Overall, the experimental composites with BG showed at least as good marginal adaptation as the commercial reference, with an indication of possible re-sealing of marginal gaps.
Maintaining or improving the marginal integrity of composite restorations is important to prevent microleakage and its likely consequences such as pulp irritation and secondary caries.
本体外研究检测了掺有生物活性玻璃（BG）的实验性复合树脂的边缘完整性。
制备 II 类 MOD 腔并用以下复合材料之一进行修复：商业复合材料作为参比（Filtek Supreme XTE）、掺有 BG 45S5 的实验性复合材料（C-20）和掺有含氟 BG 的实验性复合材料（F-20）。使用了六个实验组（n=8），每个复合材料均与通用粘合剂（Adper Scotchbond Multipurpose）一起使用（+）或不使用（-）。所有标本均进行热循环（10000 次，5-55°C），然后在人工唾液中再储存八周。在三个时间点（初始、热循环后和人工唾液中储存八周后）拍摄近中和远中盒的扫描电子显微镜照片。边缘被分类为“连续”和“不连续”，并对连续边缘的百分比（PCM）进行了统计分析（α=0.05）。
在大多数实验组中，热循环导致 PCM 显著降低，而额外的 8 周老化没有显著影响。F-20+在人工唾液中储存 8 周后表现明显优于含粘合剂的参比材料（p=0.005），而在其他两个时间点则没有观察到统计学差异。C-20+在热循环后（p=0.026）和 8 周后（p=0.003）均显示出比含粘合剂的参比材料更好的 PCM。
总体而言，掺有 BG 的实验性复合材料的边缘适应性至少与商业参比材料一样好，表明边缘间隙可能有重新密封的迹象。
保持或改善复合树脂修复的边缘完整性对于防止微渗漏及其可能的后果（如牙髓刺激和继发龋）很重要。
