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Influence of the nano-hardness and elastic modulus of carious primary tooth dentin to resin adhesion

龋齿乳牙牙本质纳米硬度和弹性模量对树脂粘附的影响

基本信息

批准号：
14571955
负责人：
HOSOYA Yumiko
金额：
$ 2.3万
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：
2002
资助国家：
日本
起止时间：
2002 至 2004
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-14571955/
关键词：
Primary tooth under decay dentin sound dentin nano-hardness elastic modulus micro-tensile bond strength adhesive resin Novel Iig system for micro-tensile strength 接着性レジン微少硬度微少引張接着強さ接着試験用jig

项目摘要

<Objective> :To compare the influence of the hardness and elasticity to resin adhesion between carious and sound dentin.<Results> :1.Development of originally designed jig system for micro-tensile strength Testing :New system for primary teeth has been developed.2.Hardness, elasticity and micro-tensile strengths of the carious and sound primary dentin :Physical properties of extracted primary tooth dentin were lower than permanent tooth dentin, especially for the dentin under the lesion and near me pulp.3.Hardness and elasticity of bonded carious and sound dentin :Clearfil Mega Bond (MB group, Kuraray Co.) and Single Bond (3M ESPE Co.Ltd.) were used. Compared to the dentin beneath the resin/dentin interface, the hardness of the interface dentin were higher and showed contrary results to previously reported permanent teeth. But, Young's modulus of the interface dentin were lower than dentin beneath the interface, same as for permanent teeth. No significant difference was found between the carious and sound groups.4.Micro-tensile bond strength(MTBS) for sound and carious dentin :MB or SB was applied on the extracted primary tooth dentin. Dumbbell-shaped and stick-shaped specimens were prepared. The mean MTBS of both dumbbell-shaped and stick-shaped specimens were low, and under 10MPa. No significant difference was found between the MB and SB, and sound and carious groups.<Conclusion> :When bonded to carious dentin, the HL was thicker, but the MTBS was low in both the carious and sound groups. The properties of primary tooth dentin might differ from permanent dentin, thus treatments designed based on permanent tooth dentin may not be optimized for primary tooth dentin. New system based on the physical properties of primary tooth dentin should be required.

目的：比较龋病与健牙本质的硬度和弹性对树脂粘附性的影响。结果：1.自行设计的乳牙微拉伸强度测试夹具系统已研制成功。2.龋病乳牙本质的硬度、弹性和微拉伸强度：拔除的乳牙本质的物理性能低于恒牙本质，尤其是病损下和牙髓附近的牙本质。3.粘结龋齿和健牙本质的硬度和弹性：Clearfi Mega Bond(MB组，Kuraray Co.)和Single Bond(3M ESPE Co.Ltd.)都是用过的。与树脂/牙本质界面下的牙本质相比，界面牙本质的硬度更高，其结果与以往报道的恒牙相反。但是，界面牙本质的杨氏模数低于界面下的牙本质，恒牙也是如此。4.健康牙本质与龋坏牙本质的微拉伸粘结强度：在拔除的乳牙牙本质上分别施加MB或SB。制备了哑铃形和棒状试件。哑铃形和棒状试件的平均MTBS均较低，均在10 Mpa以下。MB组与SB组、健康组与龋齿组之间无显著差异。结论：龋病组与龋坏组粘结时，HL较厚，MTBS较低。乳牙本质的性质可能与恒牙本质不同，因此基于恒牙本质设计的治疗方法可能不适用于乳牙本质。需要一种基于乳牙本质物理性质的新系统。