Effect of aging on deformation behavior of dentin in small area.

时效对牙本质小区域变形行为的影响。

• 批准号: 09470433
• 负责人: TAKAHASHI Hidekazu
• 金额: $ 6.02万
• 依托单位: Tokyo Medical and Dental University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 1997
• 资助国家: 日本
• 起止时间: 1997 至 1998
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-09470433/
• 关键词: Dentin; Tensile test; Tensile strength; Elastic modulus; Aging; Fatigue; Laser speckle pattern; 歯質; レーザスペックル; 根管治療薬; サーコルサイクル

In this research, we tried to evaluated effects of aging on deformation behavior of dentin in small area. A laser speckle strain measurement was examined for possibility of dentin specimen application ; this method was considered to be suitable for strain measurement of small dentin specimen. Simulation procedure of aging effect on dentin were evaluated after immersion into intercanal medicaments and storage in 5ﾟC or 55ﾟC water and thermocycling test. Dentin tensile strength after a certain intercanal medicament significantly increased, however immersion into-intercanal medicaments was not similar effects of aging on dentin properties. Water storage for two week between 5ﾟC and 55ﾟC did not significantly effect on dentin tensile strength ; however obtained Weibull modulus after two week thermocycling had a tendency to decreased ; therefore longer water immersion might be similar effect of aging on dentin. Further investigation is necessary to clarify the aging mechanism of dentin.

本研究试图在小范围内评价老化对牙本质变形行为的影响。本文研究了激光散斑应变测量方法在牙本质标本中应用的可行性，认为该方法适用于小型牙本质标本的应变测量。模拟牙本质老化过程，将牙本质浸泡于根管间药物中，置于5 ℃或55 ℃的水中保存，并进行热循环试验。牙本质抗张强度在一定的根管间药物浸泡后显著增加，但根管间药物浸泡对牙本质性能的影响并不相似。在5 ℃ ~ 55 ℃温度范围内浸泡两周对牙本质抗拉强度无明显影响，但两周后的Weibull模量有下降趋势，因此浸泡时间越长，牙本质抗拉强度越低，说明老化对牙本质的影响可能与浸泡时间越长有关。牙本质的老化机制有待进一步研究。

项目成果

中野文夫: "牛歯象牙質の機械的性質に及ぼす根管治療薬の影響" 歯科材料 器械. 18・2. (1999)

Fumio Nakano：“根管治疗药物对牛牙本质机械性能的影响”牙科材料和仪器（1999）。

井上利志子 ほか: "牛歯象牙質の機械的性質に与えるサースルサイクリングの影響" 歯科材料・器械. 18・特35. (1999)

Rishiko Inoue 等人：“口渴循环对牛牙本质机械性能的影响”牙科材料和仪器 18/Special 35。（1999 年）

Tonami K.and Takahashi H: "Effects of Aging on Tensile Fafigue Strength of Bovine Dentin" Dental Material Journal. 16・2. 156-169 (1997)

Tonami K.和Takahashi H：“老化对牛牙本质拉伸疲劳强度的影响”牙科材料杂志16・2（1997）。

F.NAKANO et al: "Effect of Intracanal medicaments on Mechanical Properties of Bovine Dentin" J Dent Res. 77(S・B). 949 (1998)

F.NAKANO 等人：“根管内药物对牛牙本质机械性能的影响”J Dent Res 77(S·B) 949 (1998)。

H.TAKAHASHI et al: "Correlation of Elastic Modulus Between Noncontact and Strain Gage Measurement." J Dent Res. 77(SB). 914 (1998)

H.TAKAHASHI 等人：“非接触式和应变计测量之间弹性模量的相关性。”