Hioki Makiha, Shin-Ya Akikazu, Nakahara Rizako, Vallittu Pekka K, Nakasone Yuji, Shin-Ya Akiyoshi
Department of Oral Development and Orthodontics, Institute of Dentistry, University of Turku, Lemminkaisenkatu 2, FI-20520 Turku, Finland.
Dent Mater J. 2007 Sep;26(5):700-7. doi: 10.4012/dmj.26.700.
The objective of this study was to evaluate the influences of enamel shape and bracket base configuration on shear bond strength from a biomechanical point of view. To this end, shear bond test and stress analysis using finite element method (FEM) were performed. Results obtained from both tests were then comprehensively investigated. Maxillary incisors were prepared for plane specimens, while mandibular premolars were prepared for curvature specimens. Shear bond test was carried out with three different test conditions. Two finite element models of enamel shape and bracket base configuration were also created. An approximate mean load of 200 N was applied. Results revealed that the shear bond strength of plane model was higher than that of curvature model. In conclusion, the present study revealed that shear bond strength was significantly influenced by enamel shape and bracket base configuration, whereby a curvature configuration tended to have lower bond strength.
本研究的目的是从生物力学角度评估牙釉质形状和托槽基底形态对剪切粘结强度的影响。为此，进行了剪切粘结试验和使用有限元方法（FEM）的应力分析。然后对两个试验获得的结果进行了综合研究。上颌切牙制备成平面样本，而下颌前磨牙制备成弯曲样本。在三种不同的试验条件下进行了剪切粘结试验。还创建了两个牙釉质形状和托槽基底形态的有限元模型。施加了约200 N的平均载荷。结果表明，平面模型的剪切粘结强度高于弯曲模型。总之，本研究表明，剪切粘结强度受牙釉质形状和托槽基底形态的显著影响，弯曲形态往往具有较低的粘结强度。
