Omidkhoda Maryam, Eslami Neda, Mazloum Maryam, Entezari Mostafa
Dental Materials Research Center, Mashhad University of Medical Sciences, Mashhad, Iran.
Department of Orthodontics, School of Dentistry, Mashhad University of Medical Sciences, Mashhad, Iran.
J Orthod Sci. 2023 Mar 18;12:6. doi: 10.4103/jos.jos_31_22. eCollection 2023.
This study aimed to evaluate the bond strength of light- and chemical-cure adhesive systems over six months.
A total of 144 sound human maxillary first and second premolars were randomly divided into six groups according to the adhesive type (i.e., Transbond XT and Unite) and evaluation time. The groups were T0 (24-h group without thermocycling), T1 (24-h group with thermocycling), T2 (1-month group), T3 (2-month group), T4 (4-month group), and T5 (6-month group). The bond strength was then measured and the data were analyzed by SPSS software (version 23) through the independent t-test and one-way ANOVA. A value less than 0.05 was considered statistically significant.
The results of this study showed that shear bond strength of chemical-cure orthodontic adhesive (Unite, 15.37 MPa) at all-time points was significantly 1.37 times higher than that of the Transbond XT light-cure adhesive (11.15 MPa). Moreover, shear bond strength of self-cure adhesive (Unite) 1 month after debonding showed a significant difference with the 24-h group without thermocycling ( = 0.002), 24-h group with thermocycling ( = 0.008), and 6-month group ( = 0.016). The highest shear bond strength in both adhesives was observed at one month. Furthermore, the shear bond strength of Transbond XT light-cure adhesive one month after debonding showed a significant difference with the 24-h group without thermocycling ( = 0.000) and 24-h group with thermocycling ( = 0.000), as well as with the 2-month ( = 0.008), 4-month ( = 0.000), and 6-month groups ( = 0.016).
Unite self-cure adhesive compared to Transbond XT light-cure adhesive has higher bond strength and is recommended for rebonding brackets in patients with multiple rebonds.
本研究旨在评估光固化和化学固化粘接系统在六个月内的粘接强度。
根据粘接剂类型（即Transbond XT和Unite）和评估时间，将总共144颗健康人上颌第一和第二前磨牙随机分为六组。这些组分别为T0（无热循环的24小时组）、T1（有热循环的24小时组）、T2（1个月组）、T3（2个月组）、T4（4个月组）和T5（6个月组）。然后测量粘接强度，并通过SPSS软件（版本23）采用独立t检验和单因素方差分析对数据进行分析。P值小于0.05被认为具有统计学意义。
本研究结果表明，化学固化正畸粘接剂（Unite，15.37MPa）在所有时间点的剪切粘接强度均显著高于Transbond XT光固化粘接剂（11.15MPa），高出1.37倍。此外，脱粘后1个月自固化粘接剂（Unite）的剪切粘接强度与无热循环的24小时组（P = 0.002）、有热循环的24小时组（P = 0.008）和6个月组（P = 0.016）相比有显著差异。两种粘接剂在1个月时观察到最高的剪切粘接强度。此外，脱粘后1个月Transbond XT光固化粘接剂的剪切粘接强度与无热循环的24小时组（P = 0.000）、有热循环的24小时组（P = 0.000）以及2个月组（P = 0.008）、4个月组（P = 0.000）和6个月组（P = 0.016）相比有显著差异。
与Transbond XT光固化粘接剂相比，Unite自固化粘接剂具有更高的粘接强度，推荐用于多次重新粘接托槽的患者。
