Raza Monis, Kumar Piush, Gulati Nikita, Sharma Payal, Shetty Divya, Shetty Devicharan
Department of Orthodontics and Dentofacial Orthopaedics and Research, Muradnagar, Ghaziabad, Uttar Pradesh, India.
Department of Oral and Maxillofacial Pathology, I.T.S. Center for Dental Studies and Research, Muradnagar, Ghaziabad, Uttar Pradesh, India.
J Orthod Sci. 2020 Nov 2;9:16. doi: 10.4103/jos.JOS_3_20. eCollection 2020.
To compare demineralization around orthodontic brackets cured by conventional method and transillumination method.
Sixty freshly extracted human premolar teeth were divided into four groups. Group 1: Brackets bonded with conventional method of bonding by curing labially for 40 sec. Group 2: Brackets bonded with transillumination method of bonding for 50 sec. Group 3: Brackets bonded with conventional method of bonding by curing labially for 20 sec followed by 30 sec of transillumination. Group 4: Brackets bonded with transillumination method of bonding for 30 sec followed by labial curing for 20 sec. Ground sections were prepared of each tooth and microleakage was evaluated using a binocular microscope at 40× magnification (Olympus BX53) and an image was taken using a digital camera (Olympus EPL3) connected to the microscope. The images were analyzed using Magnus Pro Image software. Scores were assigned to different degrees of microleakage at the demineralization zone around enamel-adhesive-bracket complex at the occlusal, middle, and gingival margins using linear measurement tool. Data obtained was subjected to statistical analysis using SPSS software (Version 20.0). Level of significance was kept at 5%. Intragroup comparison was done using Kruskal-Wallis test followed by Mann-Whitney U-tests for pairwise comparison.
Group 4 showed least mean demineralization in occlusal, middle, and cervical areas as compared to other groups and the results were statistically significant ( < 0.05).
Transillumination can be employed as a method synergistically with conventional curing to achieve minimum amount of demineralization during fixed orthodontic treatment.
比较传统方法和透照法固化正畸托槽周围的脱矿情况。
将60颗新鲜拔除的人类前磨牙分为四组。第1组：采用传统粘结方法，唇侧固化40秒粘结托槽。第2组：采用透照法粘结托槽50秒。第3组：采用传统粘结方法，唇侧固化20秒，然后透照30秒粘结托槽。第4组：采用透照法粘结托槽30秒，然后唇侧固化20秒。对每颗牙齿制作磨片，使用双目显微镜（奥林巴斯BX53）在40倍放大倍数下评估微渗漏情况，并使用连接到显微镜的数码相机（奥林巴斯EPL3）拍摄图像。使用Magnus Pro Image软件分析图像。使用线性测量工具对釉质-粘结剂-托槽复合体咬合面、中部和牙龈边缘脱矿区域不同程度的微渗漏进行评分。使用SPSS软件（版本20.0）对获得的数据进行统计分析。显著性水平设定为5%。组内比较采用Kruskal-Wallis检验，随后采用Mann-Whitney U检验进行两两比较。
与其他组相比，第4组在咬合面、中部和颈部区域的平均脱矿最少，结果具有统计学意义（P<0.05）。
在固定正畸治疗中，透照法可与传统固化方法协同使用，以实现最小程度脱矿。
