Omidkhoda Maryam, Hosseini Rivandi Maryam, Mohammadipour Hamideh Sadat, Dehghani Mahboobe
Dental Materials Research Center, Mashhad University of Medical Sciences, Mashhad, Iran.
Department of Orthodontics, School of Dentistry, Mashhad University of Medical Sciences, Mashhad, Iran.
Int J Dent. 2025 Jan 17;2025:2175748. doi: 10.1155/ijod/2175748. eCollection 2025.
This research aimed to assess the shear bond strength (SBS) of metal brackets bonded to composite veneers using different surface preparations. One-hundred composite disks were divided into 10 different groups whereby each group combines a surface preparation (roughening or no roughening), etching agent (37% phosphoric or 9.5% hydrofluoric acid), adhesive protocol (self-etch or total-etch), and bonding agent (with or without G-Premio Bond). Orthodontic metal brackets were bonded to prepared composite surfaces by Transbond XT resin and light-cured. The prepared samples were incubated at 37˚C for 24 h and underwent thermocycling. A universal testing machine was loaded until the failure moment to assess SBS. Adhesive remnant index (ARI) was used to classify the failure sites between the composite surface and bracket base. Tukey, Fisher's exact, and chi-square tests were used for statistical analyses. Statistical significance level was 0.05. Surface roughening and the type of material used for surface preparation significantly affected bond strength ( < 0.0001). There was no significant difference in bond strength between phosphoric acid and hydrofluoric acid ( > 0.05). The highest bond strength was observed in the group with roughening + total-etch with phosphoric acid + G-Premio Bond (10.24 ± 2.99 MPa). The lowest bond strength was found in the group without roughening, etched with phosphoric acid (1.47 ± 1.06 MPa). In the groups without roughening, ARI scores of 0 and 1 were found, while in the groups with roughening, ARI scores of 0, 1, and 4 were observed. The SBS with G-Premio Bond is high with ARI score 4 which may pose a risk of damage to the veneers during debonding. Therefore, surface preparation of the veneers that result in lesser bond strength should be used unless in patients with frequent bracket breakages.
本研究旨在评估使用不同表面处理方法将金属托槽粘结到复合贴面时的剪切粘结强度（SBS）。将100个复合盘分为10个不同的组，每组结合一种表面处理方法（粗糙化或无粗糙化）、蚀刻剂（37%磷酸或9.5%氢氟酸）、粘结方案（自酸蚀或全酸蚀）和粘结剂（有或无G-Premio Bond）。正畸金属托槽通过Transbond XT树脂粘结到制备好的复合表面并光固化。将制备好的样本在37˚C下孵育24小时并进行热循环。使用万能试验机加载直至破坏时刻以评估SBS。使用粘结剂残留指数（ARI）对复合表面与托槽基底之间的破坏部位进行分类。采用Tukey检验、Fisher精确检验和卡方检验进行统计分析。统计学显著性水平为0.05。表面粗糙化和用于表面处理的材料类型对粘结强度有显著影响（<0.0001）。磷酸和氢氟酸之间的粘结强度无显著差异（>0.05）。在粗糙化+全酸蚀+磷酸+G-Premio Bond组中观察到最高粘结强度（10.24±2.99MPa）。在无粗糙化、用磷酸蚀刻的组中发现最低粘结强度（1.47±1.06MPa）。在无粗糙化的组中，ARI评分为0和1，而在有粗糙化的组中，观察到ARI评分为0、1和4。含有G-Premio Bond的SBS较高，ARI评分为4，这可能在去粘结过程中对贴面造成损坏风险。因此，除非是托槽频繁断裂的患者，否则应使用导致粘结强度较低的贴面表面处理方法。
