Department of Conservative Dentistry, Prince of SongklaUniversity, Hat Yai, Songkhla, Thailand.
Eur J Orthod. 2010 Feb;32(1):87-93. doi: 10.1093/ejo/cjp055. Epub 2009 Oct 1.
This study was conducted to evaluate the shear bond strength (SBS) of various ceramic bracket base designs bonded to glazed aluminous (Vitadur Alpha) and fluorapatite (IPS e.max Ceram) ceramics, to examine the mode of failure, and to determine the debonding characteristics of the brackets and the ceramic surfaces after bond failure. Forty ceramic discs (15 mm in diameter and 1.5 mm thick) of each ceramic were prepared and divided into four equal groups. Ten pieces of each group of different bracket bases (beads, Inspire Ice; large round pits, Crystalline IV; and irregular base, Clarity) and one group of stainless steel brackets (Optimesh XRT, control) were bonded to glazed ceramics under a 200 g load. All specimens were then subjected to SBS evaluation using a universal testing machine at a crosshead speed of 0.2 mm per minute. The data were analysed using analysis of variance and Tukey's test at a significance level of 0.05. The mode of failure was examined under a stereomicroscope. The results demonstrated that for Vitadur Alpha and IPS e.max Ceram, the highest SBS were found with Inspire Ice (25.1 +/- 2.6 and 24.9 +/- 2.1 MPa) and were significantly different than Crystalline IV (21.6 +/- 1.1 and 20.9 +/- 1.5 MPa), Clarity (19.6 +/- 1.5 and 19.3 +/- 2.3 MPa), and Optimesh XRT (14.9 +/- 1.3 and 15.3 +/- 2.2 MPa; P < 0.05). Inspire Ice and Crystalline IV had 100 per cent adhesive failure while Clarity and Optimesh XRT had combination failure. The various base designs gave different SBS, but the SBS of all base designs could withstand normal orthodontic force.
本研究旨在评估不同陶瓷托槽基底设计与上釉氧化铝（Vitadur Alpha）和氟磷灰石（IPS e.max Ceram）陶瓷的粘结剪切强度（SBS），观察失效模式，并确定托槽和陶瓷表面的脱粘特征。制备了 40 个直径为 15mm、厚度为 1.5mm 的陶瓷圆盘，每个陶瓷分为 4 组。每组的 10 个不同托槽基底（珠子，Inspire Ice；大圆形凹坑，Crystalline IV；不规则基底，Clarity）和一组不锈钢托槽（Optimesh XRT，对照组）在 200g 载荷下粘结到上釉陶瓷上。所有标本均在万能试验机上以 0.2mm/min 的十字头速度进行 SBS 评估。使用方差分析和 Tukey 检验在 0.05 的显著性水平下分析数据。在立体显微镜下观察失效模式。结果表明，对于 Vitadur Alpha 和 IPS e.max Ceram，Inspire Ice 的 SBS 最高（25.1 +/- 2.6 和 24.9 +/- 2.1 MPa），与 Crystalline IV（21.6 +/- 1.1 和 20.9 +/- 1.5 MPa）、Clarity（19.6 +/- 1.5 和 19.3 +/- 2.3 MPa）和 Optimesh XRT（14.9 +/- 1.3 和 15.3 +/- 2.2 MPa）相比有显著差异（P < 0.05）。Inspire Ice 和 Crystalline IV 发生 100%的黏附性失效，而 Clarity 和 Optimesh XRT 发生混合性失效。不同基底设计的 SBS 不同，但所有基底设计的 SBS 都能承受正常的正畸力。
