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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）。对乳牙前牙龋蚀牙本质的努氏硬度值（Knoop hardness number，KNH）进行测量，并进行统计学分析。结果显示，健侧牙本质的KHN值由外层向内层逐渐降低。龋侧和健侧龋下区和最内层的KHN均显著低于外层。在声侧，腔下区的KNH值显著低于与腔下区相当的区域。龋侧邻近无龋区的KHN值也明显低于健侧与无龋区相当的区域。透明牙本质比健全牙本质软。本文用点分析法研究了碳包埋黑色化合物试样的努普硬度与Ca、P、Ca/P和Mg的相关性。 ...更多信息艾德能谱分析表明，在几乎所有测区，KHN与Ca、P、Ca/P和Mg之间均无显著相关性。去龋方法对未龋坏乳牙本质硬度的影响将龋坏扩展到牙本质的乳牙进行切片。对于切片样本的一侧，使用化学机械龋齿去除凝胶Carisolv ®去除龋齿<TM>（第1组），对于切片样本的另一侧，使用圆形牙钻去除龋齿（第2组）。从龋齿去除表面至髓室壁300μm深度测定硬度。第1组和第2.4组之间的KHN无显著差异）。用纳米压痕仪测量龋坏和健康犬牙本质的硬度（H）和弹性模量（Y）。对于健康牙，内层的H和Y值显著低于外层和中间层。龋洞下区的H值和Y值均显著低于健康侧与龋洞下区相当区域的H值和Y值。与健康牙上相应区域相比，患牙邻近非龋洞区的H值和Y值也有明显降低的趋势。少