Conservative Dentistry Department, Faculty of Dentistry, Mansoura University, Algomhoria Street, PO Box 35516, Mansoura, Aldakhlia, Egypt.
BMC Oral Health. 2024 Oct 5;24(1):1188. doi: 10.1186/s12903-024-04879-2.
This study aims to evaluate the microtensile bond strength (µTBS) of different resin composite restorations bonded to mid-coronal dentin and proximal root dentin using light-cured, chemical-cured, and dual-cured adhesives immediately and after aging. Nanoleakage and degree of cure were also assessed.
Eighty-four molars were divided into mid-coronal dentin and proximal root dentin. Each group was further subdivided into three subgroups based on the restorative systems used, which involved the utilization of light-cured, chemical-cured, and dual-cured adhesives. Half of the specimens underwent µTBS testing after 24 h, while the other half after aging. Representative specimens were analyzed for nanoleakage. The degree of cure of the tested adhesive systems was also assessed.
Aging showed a significant negative effect on µTBS results and led to increased nanoleakage (p < 0.001). Furthermore, in all subgroups, the µTBS values of proximal root dentin were lower compared to mid-coronal dentin, except in the aged subgroup for the system utilizing the dual-cured adhesive. The restorative systems with chemical and dual-cured adhesives demonstrated comparable bonding properties. However, the system with the light-cured adhesive exhibited the worst bonding properties after aging when bonded to proximal root dentin and cured at a large distance (p < 0.05).
All tested restorative systems were negatively affected by aging, and the regional dentin had variable effects on the bonding properties. Clinicians should exercise caution when using the tested light-cured adhesive in areas where the curing distance exceeds 3 mm.
本研究旨在评估即刻和老化后使用光固化、化学固化和双重固化黏结剂对近中牙本质和近根牙本质进行不同树脂复合材料修复的微拉伸黏结强度（µTBS）。还评估了纳米渗漏和固化程度。
84 颗磨牙分为近中牙本质和近根牙本质。每组根据使用的修复系统进一步分为三个亚组，涉及光固化、化学固化和双重固化黏结剂的使用。一半样本在 24 小时后进行 µTBS 测试，另一半在老化后进行。代表性样本用于分析纳米渗漏。还评估了测试黏结系统的固化程度。
老化对 µTBS 结果有显著的负面影响，并导致纳米渗漏增加（p<0.001）。此外，在所有亚组中，近根牙本质的 µTBS 值均低于近中牙本质，除了使用双重固化黏结剂的系统在老化亚组中。化学和双重固化黏结剂的修复系统具有相似的黏结性能。然而，当在老化后将光固化黏结剂用于近根牙本质且在较大距离固化时，其黏结性能最差（p<0.05）。
所有测试的修复系统均受老化的负面影响，区域性牙本质对黏结性能有不同的影响。当在固化距离超过 3mm 的区域使用测试的光固化黏结剂时，临床医生应谨慎操作。
