Heravi Farzin, Moazzami Saied Mostafa, Kerayechian Navid, Nik Elham
Department of Orthodontics and Dental Research Center, Mashhad University of Medical Sciences, Iran.
Aust Orthod J. 2011 May;27(1):4-9.
Fibre reinforced composite bars (FRC) have applications as bonded retainers, space maintainers and anchorage/movement units. However, the bond strength of attachments to FRC anchorage bars is unknown.
To compare the shear bond strengths of brackets bonded immediately to FRCs with different orthodontic adhesive systems and bonded with the same adhesives after a 48-hour delay, abraded with a diamond bur and etched with phosphoric acid.
One hundred and five recently extracted upper premolars were randomly assigned to seven groups (N = 15 teeth per group). FRCs were bonded to the buccal surfaces of the teeth and stainless steel orthodontic brackets were bonded to the FRCs with the following adhesive systems: Group 0 (Tetric Flow); Groups 1, 2 and 3 (Immediate bonding with chemically cured, no-mix and light cured composites, respectively, the bars covered with Tetric Flow); Groups 4, 5 and 6 (Bonding to FRCs delayed 48 hours, then bonded with chemically cured, no-mix and light cured composites, respectively, the bars covered with Tetric Flow). The FRC bars in Groups 4, 5 and 6 were abraded with a coarse-grit diamond bur before bonding the attachments to the bars. The shear bond strengths (SBS) were measured with a universal testing machine, and the adhesive remaining on the teeth after debonding was scored with the Adhesive Remnant Index (ARI). Data were analysed using analysis of variance (ANOVA), Duncan's post-hoc and Fisher's Exact test.
There were no statistically significant SBS differences between Groups 0 (Mean SBS: 9.56 MPa), 1 (Mean SBS: 9.74 MPa), 2 (Mean SBS: 10.72 MPa) or 3 (Mean SBS: 9.54 MPa). Groups 4, 5 and 6 (Bonding delayed by 48 hours) had SBSs of 11.79 MPa, 11.63 MPa and 13.11 MPa, respectively, and were significantly higher than the SBSs in Groups 1, 2 and 3 (Immediate bonding). There were no significant differences in ARI scores among the groups.
The mean SBSs in all groups fell within the clinically acceptable range (> 7 MPa). The combination of a 48-hour delay between placement of an FRC bar and bonding an attachment, abrading the FRC with a diamond bur and etching with phosphoric acid resulted in higher bond strengths.
纤维增强复合材料棒（FRC）可用作粘结式保持器、间隙保持器和锚固/移动单元。然而，与FRC锚固棒的附着粘结强度尚不清楚。
比较使用不同正畸粘结系统立即粘结到FRC上的托槽，以及在延迟48小时后使用相同粘结剂粘结、用金刚砂车针打磨并用磷酸酸蚀后的托槽的剪切粘结强度。
将105颗近期拔除的上颌前磨牙随机分为七组（每组n = 15颗牙）。将FRC粘结到牙齿的颊面，并使用以下粘结系统将不锈钢正畸托槽粘结到FRC上：第0组（Tetric Flow）；第1、2和3组（分别用化学固化、免混合和光固化复合材料立即粘结，棒材覆盖Tetric Flow）；第4、5和6组（粘结到FRC延迟48小时，然后分别用化学固化、免混合和光固化复合材料粘结，棒材覆盖Tetric Flow）。在将附件粘结到棒材上之前，第4、5和6组的FRC棒用粗粒度金刚砂车针打磨。用万能试验机测量剪切粘结强度（SBS），并用粘结剂残留指数（ARI）对脱粘后留在牙齿上的粘结剂进行评分。使用方差分析（ANOVA）、邓肯事后检验和费舍尔精确检验对数据进行分析。
第0组（平均SBS：9.56 MPa）、第1组（平均SBS：9.74 MPa）、第2组（平均SBS：10.72 MPa）或第3组（平均SBS：9.54 MPa）之间的SBS无统计学显著差异。第4、5和6组（粘结延迟48小时）的SBS分别为11.79 MPa、11.63 MPa和13.11 MPa，显著高于第1、2和3组（立即粘结）的SBS。各组之间的ARI评分无显著差异。
所有组的平均SBS均在临床可接受范围内（>7 MPa）。在放置FRC棒和粘结附件之间延迟48小时、用金刚砂车针打磨FRC并用磷酸酸蚀的组合导致了更高的粘结强度。
