Assistant Professor Head of Oral Pathology Institute of Dentistry Liaquat university of Medical and Health Sciences, Jamshoro, Pakistan.
Associate Professor Division of Orthodontics, College of Dentistry, King Khalid University, Abha, Saudi Arabia.
Photodiagnosis Photodyn Ther. 2019 Mar;25:344-348. doi: 10.1016/j.pdpdt.2019.01.013. Epub 2019 Jan 14.
The aim of the present in-vitro study was to explore bleached enamel reversal with phototherapy (Er,Cr:YSGG) when using two dissimilar bonding system to bond brackets on microleakage and shear bond strength.
Amongst one twenty samples, ninety samples were bleached using 35% hydrogen peroxide. After the bleaching procedure, the teeth were randomly divided into three groups according to surface conditioning treatment (n = 30 each). Group 1: treated with Er,Cr:YSGG (ECL) Group 2: 10% sodium ascorbate (SA) and Group 3: Bleached only (BO). Based on the type of adhesive, specimens were further classified into eight subgroups. In subgroup 1,2,3 and no treatment (NT) (n = 15) adhesive Transbond XT was applied on already etched surface and these subgroups were named as NT-TEP, BO-TEP, ECL-TEP and SA-TEP. Similarly, in subgroup 5,6,7 and NT specimens (n = 15) were conditioned with Transbond Plus self-etching primer and these subgroups were named as NT-SEP, BO-SEP, ECL-SEP and SA-SEP. Samples from each subgroup were exposed to increasing load for evaluation of shear bond strength. Microleakage among subgroups were tested by immersing samples in Methylene blue prior one day. Analysis of variance and Tukey multiple comparisons test was used to assess data.
The maximum and minimum bond strength was observed in group NT-TEP [17.14(2.54)] and BO-SEP [6.14(0.215)] respectively. Samples conditioned with phototherapy ECL-TEP [16.14(1.231)] exhibited comparable bond strength to specimens conditioned with sodium ascorbate (SA-TEP) [16.72(1.298)]. Similarly, bond strength values of ECL-SEP [13.43(0.921)] and SA-SEP were comparable. The highest microleakage score was demonstrated in BO-SEP [83.21(38.21)] whereas, the lowest microleakage scores were displayed in NT-TEP [23.73(13.45)].
Er,Cr:YSGG phototherapy reversal on bleached enamel with etch and rinse adhesives has a potential to be used in clinical settings alternate to conventional sodium ascorbate when bonding orthodontic brackets.
本体外研究旨在探讨使用两种不同的粘结系统在微渗漏和剪切粘结强度方面对带光疗（Er，Cr：YSGG）粘结托槽的漂白牙进行逆转的效果。
在二十个样本中，九十份样本使用 35%过氧化氢进行漂白。漂白程序后，根据表面处理（n=30）将牙齿随机分为三组。第 1 组：使用 Er，Cr：YSGG（ECL）处理；第 2 组：使用 10%抗坏血酸钠（SA）处理；第 3 组：仅漂白（BO）。根据粘结剂的类型，进一步将样本分为八个亚组。在亚组 1、2、3 和无处理（NT）（n=15）中，在已经蚀刻的表面上应用 Transbond XT 粘结剂，这些亚组分别命名为 NT-TEP、BO-TEP、ECL-TEP 和 SA-TEP。同样，在亚组 5、6、7 和 NT 标本（n=15）中用 Transbond Plus 自酸蚀底漆处理，这些亚组分别命名为 NT-SEP、BO-SEP、ECL-SEP 和 SA-SEP。将每组的标本分别暴露在不同的载荷下进行剪切粘结强度评估。前一天将标本浸泡在亚甲蓝中，对各组间的微渗漏进行测试。采用方差分析和 Tukey 多重比较检验进行数据分析。
最大和最小粘结强度分别出现在 NT-TEP 组[17.14(2.54)]和 BO-SEP 组[6.14(0.215)]。用光疗 ECL-TEP 处理的标本[16.14(1.231)]的粘结强度与用抗坏血酸钠（SA）处理的标本[16.72(1.298)]相当。同样，ECL-SEP[13.43(0.921)]和 SA-SEP 的粘结强度值也相当。BO-SEP 组的微渗漏评分最高[83.21(38.21)]，而 NT-TEP 组的微渗漏评分最低[23.73(13.45)]。
在使用酸蚀冲洗型粘结剂时，Er，Cr：YSGG 光疗对漂白牙的逆转具有替代传统抗坏血酸钠的潜力，可在临床环境中用于正畸托槽的粘结。
