In Vitro Comparison of Shear Bond Strength (SBS) of Orthodontic Brackets Bonded with 4 Adhesive Materials and Debonded at Different Time Intervals

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Abstract

Aim: This study compared the SBS of orthodontic brackets that were bonded on buccal enamel of premolars either with composite resins or with RMGI after 2 and 24 hours and after 4 weeks. Methods: 220 premolars extracted due to orthodontic reasons were divided in four groups: In 2 groups brackets were bonded with composite resins: GC connect and Transbond XT-3M, and in 2 groups with RMGI: GC FUJI LC Capsule and GC Automix. Each group was divided to 3 different time intervals: 2H, 24H and 4 weeks. At each time interval the brackets were tested using a constant load of 2.5 N and the shear bond strength recorded as stress at maximal load was recorded in MPa. Results: Our study shows that the RMGI glue GC LC Capsule had the highest shear bond strength after 2H (11.6 MPa) and after 24H (8.5 MPa) with significance of P<0.001 Conclusions: As shown also in previous studies GC Fuji LC Capsule should be considered as a safe material for bracket bonding and caries protection during orthodontic treatment, due to fluoride release around the bracket.
4种粘结材料与不同时间间隔脱粘正畸托槽的体外剪切粘结强度比较
目的:比较复合树脂与RMGI粘结在前磨牙牙釉质上的正畸托槽在2、24小时和4周后的SBS。方法:将220颗因正畸原因拔牙的前磨牙分为4组:2组用GC connect和Transbond XT-3M复合树脂粘接托槽;2组用RMGI粘接托槽:GC FUJI LC Capsule和GC Automix。每组分为3个不同的时间间隔:2H、24H和4周。在每个时间间隔内,托架在2.5 N的恒定载荷下进行测试,最大载荷下的剪切强度记录为应力,单位为MPa。结果:我们的研究表明RMGI胶GC LC胶囊在2H (11.6 MPa)和24H (8.5 MPa)后剪切结合强度最高,P<0.001,差异有统计学意义。结论:由于GC富士LC胶囊在正畸治疗过程中会在托槽周围释放氟化物,因此GC富士LC胶囊可以作为一种安全的托槽结合和龋保护材料。
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