Nawrocka Agnieszka, Nowak Joanna, Sauro Salvatore, Hardan Louis, Bourgi Rim, Lukomska-Szymanska Monika
Department of General Dentistry, Medical University of Lodz, 251 Pomorska St., 92-213 Lodz, Poland.
University Laboratory of Materials Research, Medical University of Lodz, Pomorska 251, 92-213 Lodz, Poland.
Materials (Basel). 2023 Oct 15;16(20):6697. doi: 10.3390/ma16206697.
Successful orthodontic therapy, apart from a proper treatment plan, depends on optimal bracket-enamel adhesion. Among numerous factors affecting adhesion, the type of bracket and preparation of the tooth's surface are crucial. The aim of this study was to compare the shear bond strength (SBS) of metal and ceramic brackets to the enamel's surface using direct bonding. Forty extracted human premolars were divided into four groups according to the etching method (etch-and-rinse and self-etch) and bracket type. The SBS and adhesive remnant index (ARI) were determined. The ceramic brackets achieved the highest SBS values both in the self-etch (SE) and etch-and-rinse (ER) protocols. Higher SBS values for ceramic and metallic brackets were found in the ER protocol. In all tested groups, the achieved SBS value was satisfactory to withstand orthodontic and occlusal forces. There was no significant difference in the ARI score between study groups ( = 0.71). The fracture occurred between the bracket base and adhesive material in both types of brackets, which decreased the risk of enamel damage during debonding.
成功的正畸治疗，除了要有合适的治疗方案外，还取决于最佳的托槽-牙釉质黏附。在众多影响黏附的因素中，托槽类型和牙齿表面处理至关重要。本研究的目的是通过直接黏结比较金属托槽和陶瓷托槽与牙釉质表面的剪切粘结强度（SBS）。根据酸蚀方法（酸蚀冲洗法和自酸蚀法）和托槽类型，将40颗拔除的人类前磨牙分为四组。测定了SBS和黏附剂残留指数（ARI）。在自酸蚀（SE）和酸蚀冲洗（ER）方案中，陶瓷托槽均获得了最高的SBS值。在ER方案中，陶瓷和金属托槽的SBS值更高。在所有测试组中，所获得的SBS值足以承受正畸力和咬合力。研究组之间的ARI评分无显著差异（=0.71）。两种类型的托槽在托槽底座和黏结材料之间均发生断裂，这降低了去粘结过程中牙釉质损伤的风险。
