Basic Sciences, College of Science and Health Professions, King Saud bin Abdulaziz University for Health Sciences, Riyadh, Saudi Arabia.
King Abdullah International Medical Research Center, Riyadh, Saudi Arabia.
Lasers Med Sci. 2024 Jun 13;39(1):156. doi: 10.1007/s10103-024-04097-w.
The risk of enamel deterioration that frequently coexists with debonding of orthodontic teeth brackets elevates the mandate for finding an optimum approach for debonding them without harmful effects. This in-vitro study is intended to compare the effects of two different laser modes (scanning and circular) and a conventional method on the enamel surface after debonding orthodontic brackets. 66 extracted premolars were assigned into 3 groups. After that, light-cure composite resin was used to attach the ceramic brackets to the teeth. Amongst the test groups, Group I: specimens that were debonded using conventional debonding using pliers; Group 2: specimens that were debonded using Er, Cr: YSGG laser applications using the circular motion method; and Group 3: specimens that were debonded using Er, Cr: YSGG laser applications using the scanning motion method. Adhesive Remnant Index (ARI) assessment, intra-pulpal temperature increase, enamel surface roughness after polishing, and assessment of the microstructure of enamel were carried out with scanning electron microscopy. The gathered information was examined statistically. The conventional debonding method had a significantly higher proportion of adhesive remnant index (ARI) scores of 2 and 3 in comparison to the circular (p < .004) and scanning laser groups (p < .001). There was no significant difference in ARI scores between the circular and scanning laser groups (p > .05). Moreover, the circular and scanning laser debonding methods resulted in a significantly higher proportion of Enamel Surface Roughness (ESR) scores of 0 and a lower proportion of ESR scores of 3 compared to the conventional technique group (p < .001). However, there was no significant difference in ESR scores between the circular and scanning laser methods (p = .945). Lastly, the average intra-pulpal temperature was significantly higher in the circular laser group (1.9 ± 0.5 ) compared to the scanning laser group (0.9 ± 0.2) with p < .001. Er, Cr: YSGG laser irradiation is a tool that shows promise for debonding ceramic brackets with minimal harm to the enamel surface. The scanning laser technique is more desirable due to the lower intra-pulpal temperature increase.
正畸托槽脱落后，常伴有釉质恶化的风险，因此需要寻找一种最佳方法来脱落后而不造成有害影响。本体外研究旨在比较两种不同激光模式（扫描和圆形）和传统方法对正畸托槽脱落后釉质表面的影响。将 66 颗离体前磨牙分为 3 组。之后，用光固化复合树脂将陶瓷托槽粘接到牙齿上。在实验组中，I 组：用传统钳子脱落后的标本；2 组：用 Er、Cr：YSGG 激光以圆形运动方式脱落后的标本；3 组：用 Er、Cr：YSGG 激光以扫描运动方式脱落后的标本。采用粘着残留指数（ARI）评估、牙髓内温度升高、抛光后釉质表面粗糙度和扫描电子显微镜评估釉质微观结构。对收集到的信息进行统计学分析。与圆形（p<0.004）和扫描激光组（p<0.001）相比，传统脱落后的标本的粘着残留指数（ARI）评分 2 和 3 的比例明显更高。圆形和扫描激光组之间的 ARI 评分无显著差异（p>0.05）。此外，与传统技术组相比，圆形和扫描激光脱落后的方法导致釉质表面粗糙度（ESR）评分 0 的比例显著更高，而 ESR 评分 3 的比例显著更低（p<0.001）。然而，圆形和扫描激光方法之间的 ESR 评分无显著差异（p=0.945）。最后，圆形激光组的平均牙髓内温度（1.9±0.5）明显高于扫描激光组（0.9±0.2），p<0.001。Er、Cr：YSGG 激光照射是一种有前途的工具，可在不损害釉质表面的情况下最小化脱落后的陶瓷托槽。由于牙髓内温度升高较低，因此扫描激光技术更可取。
