Department of Orthodontics and Dentofacial Orthopaedics, MES Dental College, Perinthalmanna, Kerala, India.
Department of Orthodontics and Dentofacial Orthopaedics, MES Dental College, Perinthalmanna, Kerala, India, Phone: +91 9746277277, e-mail:
J Contemp Dent Pract. 2022 Sep 1;23(9):900-906. doi: 10.5005/jp-journals-10024-3409.
This study aimed to evaluate the shear bond strength (SBS) of orthodontic brackets with primer pre-curing and co-curing using three light cure adhesive systems.
In this study, 102 extracted premolar teeth mounted on self-cure acrylic resin blocks were separated into six groups based on primer pre-curing and co-curing with each group receiving stainless steel orthodontic premolar brackets bonded to the buccal surfaces. The following adhesives were used: Transbond XT (3M Unitek, CA, USA), Orthofix (Anabond Stedman, India), and Enlight (Ormco, India). In the groups with pre-curing, the primer was pre-cured for 20 seconds while in the groups with co-curing, the primer and adhesive were cured together. Shear bond strength tests and Adhesive Remnant Index (ARI) were assessed followed by an scanning electron microscope (SEM) view (×3000) of the enamel surface after debonding. Statistical analysis was done using a one-way analysis of variance (ANOVA) test.
The descriptive statistics in the pre-cured groups showed a statistically significant difference. The highest mean SBS was observed for group I, i.e., Transbond XT with primer pre-curing (20.56 ± 3.22 MPa). The lowest mean SBS was for group IV, i.e., Orthofix with primer co-curing (7.57 + 0.49 MPa). The results of ANOVA revealed a significant difference among the groups. The ARI scoring and the SEM analysis also confirmed this finding.
Shear bond strength of orthodontic brackets with primer pre-curing showed a better bond strength than brackets with co-curing. The ARI data suggested that the majority of bracket failure happened at the resin-bracket interface. Scanning electron microscope analysis also confirmed the ARI and SBS findings.
During the bonding of orthodontic brackets, the primer can be co-cured where the primer and adhesive resin are cured simultaneously or pre-cured where the primer is cured separately. Most orthodontic clinicians to save time co-cure primer. Both these methods affect the SBS of brackets.
本研究旨在评估三种光固化粘接系统中使用预固化和共固化底漆对正畸托槽的剪切粘接强度（SBS）的影响。
在这项研究中，将 102 颗离体前磨牙分别固定在自凝丙烯酸树脂块上，根据每组预固化和共固化情况分为六组，每组在前磨牙颊面粘接不锈钢正畸托槽。使用的粘接剂如下：Transbond XT（3M Unitek，CA，美国）、Orthofix（Anabond Stedman，印度）和 Enlight（Ormco，印度）。在预固化组中，底漆预固化 20 秒，在共固化组中，底漆和粘接剂同时固化。随后进行剪切粘接强度测试和粘接残留指数（ARI）评估，并在离解后对釉质表面进行扫描电子显微镜（SEM）观察（×3000）。使用单向方差分析（ANOVA）检验进行统计学分析。
预固化组的描述性统计数据显示存在统计学差异。具有预固化底漆的 Transbond XT 组的平均 SBS 值最高（20.56 ± 3.22 MPa），具有共固化底漆的 Orthofix 组的平均 SBS 值最低（7.57 ± 0.49 MPa）。方差分析结果表明组间存在显著差异。ARI 评分和 SEM 分析也证实了这一发现。
具有预固化底漆的正畸托槽的 SBS 显示出比共固化托槽更强的粘结强度。ARI 数据表明，大多数托槽的破坏发生在树脂-托槽界面。SEM 分析也证实了 ARI 和 SBS 的结果。
在粘接正畸托槽时，底漆可以共固化，即底漆和粘接树脂同时固化，也可以预固化，即底漆单独固化。大多数正畸临床医生为了节省时间会选择共固化底漆。这两种方法都会影响托槽的 SBS。
