Nebbe B, Stein E
Department of Orthodontics, University of the Witwatersrand, Johannesburg, South Africa.
Am J Orthod Dentofacial Orthop. 1996 Apr;109(4):431-6. doi: 10.1016/s0889-5406(96)70125-7.
Edgewise orthodontic brackets were bonded with a light activated composite resin to 100 glazed and 100 deglazed feldspathic porcelain blocks for an in vitro comparative determination of shear/peel bond strengths. The independent variables studied were porcelain surface preparation and the time interval between activation of the composite resin and the debonding procedure. The initial shear/peel bond strength achieved on bonding to deglazed porcelain was statistically significantly greater than that on bonding to glazed porcelain (p<0.05), but after the 10-minute interval, the bond strength in the glazed porcelain sample was greater than in the deglazed sample. Many more porcelain fractures occurred on deglazed porcelain (71%) than on glazed porcelain (36%) during bond strength determination. Scanning electron microscopy evaluation suggests that deglazing does not substantially increase micromechanical adhesion of the composite resin. Bond strength adequate to withstand the application of orthodontic forces were achieved when bonding to glazed porcelain. This study indicates that deglazing may not be necessary for attachment of orthodontic brackets to porcelain surfaces.
将方丝弓正畸托槽用光固化复合树脂粘结到100块釉面和100块去釉的长石质瓷块上，以进行体外剪切/剥离粘结强度的比较测定。研究的自变量为瓷表面处理以及复合树脂固化与脱粘过程之间的时间间隔。粘结到去釉瓷上时获得的初始剪切/剥离粘结强度在统计学上显著高于粘结到釉面瓷上的强度（p<0.05），但在10分钟间隔后，釉面瓷样本中的粘结强度大于去釉样本中的粘结强度。在粘结强度测定过程中，去釉瓷（71%）上发生的瓷折裂比釉面瓷（36%）上多得多。扫描电子显微镜评估表明，去釉并不会显著增加复合树脂的微机械附着力。粘结到釉面瓷上时可获得足以承受正畸力作用的粘结强度。本研究表明，正畸托槽粘结到瓷表面时可能无需去釉。
