The nano-hardness and elastic modulus of sound deciduous canine dentin and young premolar dentin—Preliminary study
The nano-hardness and elastic modulus of sound deciduous canine dentin and young premolar dentin—Preliminary study
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DOI：
10.1007/s10856-005-6439-z
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发表时间：
2005
期刊：
影响因子：
--
通讯作者：
Y. Hosoya;G. Marshall
中科院分区：
文献类型：
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作者：
Y. Hosoya;G. Marshall
本研究的目的是比较乳牙本质和恒牙本质、颊侧和舌侧、切牙、中颈区以及外、中、内层的纳米硬度和弹性模量。对3颗前磨牙和3颗乳牙进行颊侧（BL）切面，对3颗乳牙进行中远侧（MD）切面，切面平行于牙中心长轴。采用纳米压痕仪测量硬度(H)、塑性硬度（PH）和杨氏模量(Y)。乳牙牙本质的H、PH和Y值在大多数部位明显低于前磨牙牙本质。对于乳牙本质，MD切片的H和PH值在许多层，许多区域显著高于BL切片的H和PH值。乳牙本质的H、PH、Y值一般由外向内递减，在许多地区各层间差异显著。MD切片乳牙和BD切片前磨牙本质，在许多层中，颈部区域的H、PH和Y值明显低于切牙和中心区域。最佳结合可能需要对乳牙本质和恒牙本质进行不同的治疗，也可能需要对不同的牙内位置进行不同的治疗。
The purpose of this study was to compare the nano-hardness and elastic modulus among deciduous and permanent dentin, buccal and lingual sides, incisal, center and cervical areas, and outer, middle and inner layers. Three premolars and three deciduous canines were bucco lingually (BL) sectioned, and three deciduous canines were mesio-distally (MD) sectioned parallel to the long axis at the center of the tooth. Hardness (H), plastic hardness (PH) and Young’s modulus (Y) were measured using a nano-indentation tester. The H, PH and Y values from the deciduous canine dentin were significantly lower than those from the premolar dentin at most sites. For deciduous canine dentin, the H and PH values of the MD sectioned dentin were significantly higher than those of the BL sectioned dentin in many layers of many areas. Generally deciduous canine dentin had H, PH and Y values that decreased from outer toward the inner layers and significant differences were obtained among the layers in many areas. For MD sectioned deciduous canine and BD sectioned premolar dentin, the H, PH and Y values of the cervical area were significantly lower than those of the incisal and center areas in many layers. It is possible that optimum bonding may require different treatments for deciduous and permanent dentin and perhaps also for different intratooth locations.