Mohammed Omar K, Younis Mohammed T, Dawood Alaa E
Department of Orthodontics, Pedodontics and Preventive Dentistry, College of Dentistry, University of Mosul, Mosul, Iraq.
Department of Conservative Dentistry, College of Dentistry, University of Mosul, Mosul, Iraq.
J Dent Res Dent Clin Dent Prospects. 2023 Winter;17(1):23-27. doi: 10.34172/joddd.2023.36990. Epub 2023 Apr 3.
This study aimed to measure the shear bond strength and compressive strength of orthodontic adhesives at different curing times and intensities.
Ninety extracted human premolars were used. Orthodontic brackets were bonded on the buccal surface of the teeth with orthodontic adhesive light-cured using VRN-VAFU LED curing light at different curing times (1, 3 and 5 seconds) and intensities (1000, 1600 and 2300 mW/cm ). A universal testing machine was used to measure the shear bond strength. The ratio of the adhesive remnant and compressive strength of the orthodontic adhesive, at each curing time at the different intensities, were also evaluated. The results were statistically analyzed using one-way analysis of variance followed by Tukey's test.
The lowest bond strength values (6.4, 9.9 and 12.6 MPa) were recorded with 1000 mW/ cm intensity (at all curing times) in comparison with the other intensities (<0.05). Increasing the curing time significantly increased the bond strength of the orthodontic brackets (<0.05), except when the curing time was increased from 3 sec to 5 sec at 1600 mW/cm intensity. The highest compressive strength values (130.3, 147.1 and 174 MPa) were recorded at 2300 mW/ cm intensity (at all curing times) compared to the other intensities (<0.05). The highest values of the ratio of the adhesive remnants were recorded at 1000 mW/cm intensity (at all curing times) compared to the other intensities (<0.05).
Although, increasing the curing time and\or the curing intensity has a positive effect on the bond strength and compressive strength of the orthodontic adhesive, it might be possible to suggest reducing the curing time of orthodontic adhesive to 1 sec at curing intensity of 2300 mW/cm.
本研究旨在测量正畸粘合剂在不同固化时间和强度下的剪切粘结强度和抗压强度。
使用90颗拔除的人类前磨牙。用正畸粘合剂将正畸托槽粘结在牙齿的颊面，使用VRN-VAFU LED固化灯在不同固化时间（1、3和5秒）和强度（1000、1600和2300 mW/cm²）下进行光固化。使用万能试验机测量剪切粘结强度。还评估了在不同强度下各固化时间的正畸粘合剂的粘结残余物比例和抗压强度。结果采用单因素方差分析，然后进行Tukey检验进行统计学分析。
与其他强度相比，1000 mW/cm²强度（在所有固化时间）下记录到的粘结强度值最低（6.4、9.9和12.6 MPa）（P<0.05）。增加固化时间显著提高了正畸托槽的粘结强度（P<0.05），但在1600 mW/cm²强度下，固化时间从3秒增加到5秒时除外。与其他强度相比，2300 mW/cm²强度（在所有固化时间）下记录到的抗压强度值最高（130.3、147.1和174 MPa）（P<..05）。与其他强度相比，1000 mW/cm²强度（在所有固化时间）下记录到的粘结残余物比例最高（P<0.05）。
虽然增加固化时间和/或固化强度对正畸粘合剂的粘结强度和抗压强度有积极影响，但在2300 mW/cm²的固化强度下，可能建议将正畸粘合剂的固化时间缩短至1秒。
