Hardness, elasticity, and ultrastructure of bonded sound and caries-affected primary tooth dentin
Hardness, elasticity, and ultrastructure of bonded sound and caries-affected primary tooth dentin
复制标题
DOI：
10.1002/jbm.b.30646
复制
发表时间：
2007-04-01
影响因子：
3.4
通讯作者：
Tay, F. R.
中科院分区：
文献类型：
--
作者：
Hosoya, Y.;Tay, F. R.
粘结牙本质的生物力学性能是影响树脂修复效果的重要因素。采用一步法粘接系统，对完好和患龋乳牙牙本质的硬度和弹性模量进行了测试，并观察了粘接界面的微观结构。使用6颗健康乳牙和6颗龋坏乳牙。对于健康的牙齿，使用水冷高速金刚石钻制备平坦的咬合牙本质表面。对于龋坏牙，用龋齿检测器对感染的牙本质进行染色，并用水冷低速圆钢钻和手动器械去除。将制备的牙本质用One-Up Bond F Plus（Tokuyama Dental Co.，日本东京）。用纳米压痕仪测量树脂-牙本质界面及界面下牙本质的大小，用扫描电镜和透射电镜观察。龋坏牙和健康牙的界面牙本质硬度与界面下10-80 μ m的牙本质硬度无显著性差异。然而，界面牙本质的杨氏模量显著低于界面下方40-80 μ m（龋牙）或50-80 μ m（健康牙）的牙本质。龋坏牙与健康牙界面牙本质的硬度和弹性模量无显著性差异。与健康牙本质相比，患龋牙本质上的混合层更厚，表现出更复杂的形态特征。混合层的厚度通常小于1 μ m。(c)2006 Wiley Periodicals，Inc.
Biomechanical properties of bonded dentin are important factors for resin restoration. We evaluated the hardness and elastic modulus of bonded sound and caries-affected primary tooth dentin using a one-step adhesive system, and observed the microstructure of the bonded interface. Six sound and six carious primary teeth were used. For sound teeth, flat occlusal dentin surfaces were prepared with a water-cooled high-speed diamond bur. For carious teeth, infected dentin was stained with a caries detector and removed with a water-cooled low-speed round steel bur and hand instruments. The prepared dentin was bonded with One-Up Bond F Plus (Tokuyama Dental Co., Tokyo, Japan). The resin-dentin interface and dentin beneath the interface were measured with a nanoindentation tester and observed with SEM and TEM. For both the carious and sound teeth, there was no significant difference between the hardness of the interfacial dentin and dentin 10-80 mu m beneath the interface. However, the Young's modulus of the interfacial dentin was significantly lower than the dentin 40-80 mu m (carious teeth) or 50-80 mu m (sound teeth) beneath the interface. Both the hardness and Young's modulus of the interfacial dentin were not significantly different between the carious and sound teeth. Compared to the sound dentin, the hybrid layer on the caries-affected dentin was thicker and exhibited more complicated morphologic features. The thickness of the hybrid layers was generally less than 1 mu m. (c) 2006 Wiley Periodicals, Inc.