Department of Orthodontics, Faculty of Dentistry, Alexandria University, Champollion St., Azarita, P. O. Box: 21521, Alexandria, Egypt.
BMC Oral Health. 2022 Mar 19;22(1):79. doi: 10.1186/s12903-022-02111-7.
Risk of enamel damage that often accompanies ceramic brackets debonding raises the demand of finding an optimal method for debonding of them without adverse effects. Different techniques were proposed in an attempt to facilitate their debonding. Comparison of these techniques is crucial. The aim of this study was to evaluate and compare different techniques for debonding of ceramic brackets in terms of shear bond strength and adhesive remnant index.
A total of 100 extracted premolars were randomly allocated into 5 groups. Ceramic brackets were then bonded to teeth using light cure composite resin. Among test groups; group I: served as control, group II: chemical aided debonding via peppermint oil, group III: ultrasonic aided debonding, group IV: diode laser aided debonding, and group V: Er:YAG laser aided debonding. Brackets were shear tested using universal testing machine followed by ARI assessment and evaluation of enamel microstructure was performed using scanning electron microscopy.
A significantly lower shear bond strength was found in ultrasonic, diode, and Er:YAG laser groups. However, no significant difference was found in the chemical group. A significantly higher adhesive remnant index was found solely in Er:YAG laser group with minimal enamel microstructure alterations.
Er:YAG laser is a promising tool in debonding ceramic brackets. Ultrasonic and diode laser significantly reduced shear bond strength. Yet, adhesive remnant index in both groups revealed no difference. Chemical aided debonding had little effect and hence, it cannot be recommended without further development.
陶瓷托槽脱落后常伴有釉质损伤的风险，这就需要寻找一种最佳的脱落后不会产生不良反应的方法。为此提出了不同的技术方法，尝试使托槽更容易脱落后。比较这些技术方法非常重要。本研究旨在评估和比较不同技术方法从剪切粘结强度和粘固剂残留指数两方面评估陶瓷托槽的脱落后效果。
共 100 颗离体前磨牙随机分为 5 组。用光固化复合树脂将陶瓷托槽粘结到牙齿上。在实验组中：I 组：为对照组；II 组：薄荷油化学辅助脱落后组；III 组：超声辅助脱落后组；IV 组：二极管激光辅助脱落后组；V 组：Er:YAG 激光辅助脱落后组。使用万能试验机对托槽进行剪切测试，随后进行 ARI 评估，并使用扫描电子显微镜评估釉质微观结构。
超声、二极管和 Er:YAG 激光组的剪切粘结强度显著降低。然而，化学组没有发现显著差异。Er:YAG 激光组的粘固剂残留指数显著升高，釉质微观结构改变最小。
Er:YAG 激光是一种有前途的脱除陶瓷托槽的工具。超声和二极管激光显著降低了剪切粘结强度。然而，两组的粘固剂残留指数没有差异。化学辅助脱落后效果不大，因此，在没有进一步发展的情况下，不能推荐使用。
