Microhardness and elasticity of carious vs sound primary dentin

龋齿与健全原发牙本质的显微硬度和弹性

基本信息

批准号：
11672053
负责人：
HOSOYA Yumiko
金额：
$ 1.73万
依托单位：
Nagasaki University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1999
资助国家：
日本
起止时间：
1999 至 2000
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-11672053/
关键词：
microhardness elasticity carious dentin sound dentin primary tooth

项目摘要

1). Knoop hardness to the primary dentinKnoop hardness number (KNH) were measured on the caries decayed dentin of primary anterior teeth and statistical analysis was done. As the results, the KHN were significantly decreased from the outer layer to inner layer of dentin on the sound side. The KHN of the under caries region and the KHN of the innermost region both on the carious and sound side were significantly lower than those of outer regions. The KNH of the under cavity area showed significantly lower than those of the regions, that were equivqlent to the under cavity areas, on the sound side. The KHN of the adjacent noncavity areas on the carious side also showed significantly lower tendency than those of the regions, that were equivqlent to the adjacent noncavity areas, on the sound side. Traansparent dentin was softer than sound dentin.2). Correlations between Knoop hardness and Ca, P, Ca/Pand MgSpecimens that were embedded in black compound and coated by carbon were point-analyz … More ed using EDX.In almost all measured areas, no significant correlation was observed between KHN and Ca, P, Ca/P and Mg.3). Effects of caries removal methods on hardness to underdecay primary dentinThe primary canine that were caries extended into dentin were sectioned. For one side of the sectioned specimens, caries removed using chemo-mechanical caries removal gel Carisolv^<TM> (Group 1) and for the other side of the sectioned specimens, caries was removed using a round bur (Group 2). The hardness was determined from the caries removal surface to 300μm depth toward pulp chamber wall. There was no significant difference of the KHN between Groups 1 and 2.4). Hardness and elasticity of primary dentin measured by a nanoindentatorHardness (H) and Young's modulus (Y) of the carious and sound primary canine dentin were measured by a nano-indentation tester. For sound teeth, the H and Y values of inner layer were significantly lower than those of outer and middle layers. The H and Y values of the under cavity area of the decayed teeth showed significantly lower than those of the regions, that were equivalent to the under cavity of the decayed teeth, on the sound side. The H and Y values of the adjacent non cavity areas of the decayed teeth also showed significantly lower tendency than those of the regions, that were equivalent to the adjacent non cavity area of the decayed teeth, on the sound teeth. Less

1）。在原发性前牙的龋齿腐烂的牙本上测量了原发性牙本质硬度数（KNH）的knoop硬度，并进行了统计分析。作为结果，KHN从声音侧的牙本质的外层到内层显着降低。在龋齿和声音方面，龋齿地区和最内向地区的KHN显着低于外部区域。下腔区域的KNH明显低于声音侧的腔区域的区域的KNH。龋齿侧的相邻非腔区域的KHN也显示出比声音方面相当于相邻的非腔区域的区域的趋势明显低。牙齿牙本质比声音牙本质柔软。2）。 knoop硬度与嵌入黑色化合物并用碳涂层的Ca，P，Ca/Pand mgspecimen之间的相关性是点 - 纳拉氏菌…使用EDX.IN几乎所有测量的区域，都没有观察到KHN和CA，CHH和CA，P，P，Ca/P和Mg.3）。切除了延伸到牙本质的原发性牙线的硬度降低的硬度的影响。对于截面标本的一侧，使用化学机械携带的移除凝胶Carisolv^<TM>（组）1），对于截面样品的另一侧，使用圆形BUR（组2）卸下了汽车。硬度是从龋齿去除表面确定到300μm向纸浆腔室壁的深度。第1组和2.4组之间的KHN没有显着差异）。由纳米和声音原发犬牙本质的纳米插入术（H）和Young的模量（Y）测量的原发性牙本质的硬度和弹性是通过纳米固定测试仪测量的。对于声牙，内层的H和Y值明显低于外层和中层的牙齿。衰减牙齿的腔体面积的H和Y值明显低于该区域的H和Y值，这些区域在声音侧与腐烂的牙齿的腔内相等。衰减牙齿的相邻非空腔区域的H和Y值也显示出比在声音牙齿上相当于腐烂牙齿相邻的非空腔区域的区域的趋势明显低。较少的