Sfondrini Maria Francesca, Gallo Simone, Turcato Benedetta, Montasser Mona A, Albelasy Nehal Fouad, Vallittu Pekka K, Gandini Paola, Scribante Andrea
Unit of Orthodontics and Paediatric Dentistry, Section of Dentistry, Department of Clinical, Surgical, Diagnostic and Paediatric Sciences, University of Pavia, 27100 Pavia, Italy.
Orthodontic Department, Faculty of Dentistry, Mansoura University, Mansoura 35516, Egypt.
Materials (Basel). 2021 Mar 10;14(6):1341. doi: 10.3390/ma14061341.
This study aims to assess the efficacy of a universal adhesive (Scotchbond Universal, 3M ESPE) (SB) in total-etch mode, compared to a traditional orthodontic primer (Transbond XT Primer, 3M ESPE) (XT Primer), to perform bonding of orthodontic fixed retainers along with the Transbond XT Light Cure Adhesive Paste (3M ESPE). For the in vitro study, a round section wire (Ortosmail Krugg) was bonded using XT Primer for 20 bovine incisors (Group 1) and SB for other 20 (Group 2). Samples were debonded in a universal testing machine applying a tangential force to specimens (crosshead speed of 1 millimeter per minute). Shear bond strength (SBS) and adhesive remnant index (ARI) scores were calculated. For the in vivo study, 100 patients needing upper and lower canine-to-canine fixed retainers after orthodontic treatment were randomly assigned to two groups of 50 participants each, i.e., group 1 (retainer bonding with XT Primer) and group 2 (retainer bonding with SB). Over two years, examinations were carried out monthly, and detachments were registered by considering the teeth and arches affected. In vitro, no statistically significant differences in SBS and ARI scores were demonstrated between the two groups, both showing a mean bond strength of about 12 MPa and major frequency of ARI "2" (>50% remnant adhesive on the enamel). Conversely, a significantly lower failure rate over 2 years was assessed clinically for group 2 in both arches. Independently of the adhesive and arch, incisors reported a significantly higher failure rate than canines. Scotchbond Universal used in total-etch mode could be a valid alternative to the traditional orthodontic Transbond XT Primer.
本研究旨在评估通用型粘结剂（3M ESPE公司的Scotchbond Universal，简称SB）在全酸蚀模式下，与传统正畸底漆（3M ESPE公司的Transbond XT Primer，简称XT Primer）相比，与Transbond XT光固化粘结剂糊剂（3M ESPE公司）一起用于粘结正畸固定保持器的效果。在体外研究中，使用XT Primer对20颗牛切牙（第1组）粘结圆形截面钢丝（Ortosmail Krugg），使用SB对另外20颗牛切牙（第2组）进行粘结。在万能试验机上对样本施加切向力（十字头速度为每分钟1毫米）进行脱粘。计算剪切粘结强度（SBS）和粘结剂残留指数（ARI）评分。在体内研究中，100名正畸治疗后需要上下尖牙间固定保持器的患者被随机分为两组，每组50名参与者，即第1组（使用XT Primer粘结保持器）和第2组（使用SB粘结保持器）。在两年时间里，每月进行检查，并记录受影响的牙齿和牙弓的脱落情况。在体外，两组之间在SBS和ARI评分上没有显示出统计学上的显著差异，两组的平均粘结强度均约为12 MPa，且ARI“2”的频率较高（釉质上残留粘结剂>50%）。相反，临床评估显示，第2组在两个牙弓上两年的失败率显著较低。无论使用何种粘结剂和牙弓，切牙的失败率均显著高于尖牙。在全酸蚀模式下使用的Scotchbond Universal可能是传统正畸Transbond XT Primer的有效替代品。
