Effect of etching time and light sources on the shear bond strength of metal brackets to ceramic cylinders

OBJECTIVE: To evaluate the shear bond strength of brackets bonded to ceramic with Transbond XT resin, etching time intervals (1 and 2 minutes) and three Light sources (Xenon Plasma Arc, LED and Halogen Light ), with and without silane.METHODS: In total, 12 feldspathic ceramic cylinders (15 mm x 20 mm), etched with 10% hydrofluoric acid were used. For light activation, the brackets were divided according to the light source to be used (n-15): LED UltraLume 5 (L); Apollo 95E plasma arc (AP) and Halogen light XL 2500 (H). After 24 h the samples were submitted to shear bond strength testing at crosshead speed of 0.5 mm/minute.RESULTS: The data were submitted to the analysis of variance (ANOVA) and the Tukey test (5%). Bond Strength: UltraLume 5 (11.4 ± 3.56 MPa) was superior to XL 2500 (9.12 ± 2.83 MPa) and Plasma Arc (5.11 ± 2.93 MPa) (p研究目的：评估采用Transbond XT粘接树脂（Transbond XT）将托槽粘接于陶瓷表面时的剪切粘结强度（shear bond strength），考察蚀刻时长（1分钟与2分钟）、三种光源（氙等离子弧光源、LED与卤素灯），以及使用硅烷偶联剂（silane）与否对粘结效果的影响。 研究方法：本研究共使用12块长石质陶瓷圆柱试件（尺寸为15mm×20mm），采用10%氢氟酸（hydrofluoric acid）进行蚀刻。按照所使用的光固化光源将托槽分为三组（每组n=15）：LED UltraLume 5（记为L组）、Apollo 95E等离子弧光源（记为AP组）以及Halogen light XL 2500卤素灯（记为H组）。试件静置24小时后，以0.5mm/min的十字头速度进行剪切粘结强度测试。 研究结果：采用方差分析（ANOVA）与显著性水平为5%的Tukey检验对数据进行统计分析。粘结强度结果显示：UltraLume 5（11.4±3.56MPa）优于XL 2500（9.12±2.83MPa）与等离子弧光源组（5.11±2.93MPa）（p