Do carious phenomenon affect on the lifetime of artificial root made of apatite.

龋齿现象会影响磷灰石人工牙根的使用寿命吗？

• 批准号: 06671977
• 负责人: WAKAMATSU Nobukazu
• 金额: $ 1.28万
• 依托单位: ASAHI UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 财政年份: 1994
• 资助国家: 日本
• 起止时间: 1994 至 1995
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-06671977/
• 关键词: Apatite; Fracture mechanics; Fatigue; Artificial bone; アバタイト; 寿命子測

The post-indentation method with a small specimen was to be a successful one to measure the fatigue parameter of the hydroxyapatite (HAP) polycrystals as a function of pH of acidic solutions, and to measure the crack extension behavior of a micro-cracks, which length was similar to that of fracture origin in ceramics.Although the measured fatigue parameter had dependence on the indent load, the value of the parameter was similar to those reported previously. The minimum of the stress intensity factor, K_<Ith>, was also measured by using the post-indentation method. The value of K_<Ith> ranged from 20% to 30% of the fracture toughness of the HAP ceramics.The hot-pressing was shown to be a successful method to obtain pore-free 70wt%HAP-30wt%poly-lactic acid (PLA) composites with the bulk density similar to that of bone. For the composites of HAP2 with 30wt%PLA,it was possible to align the HAP crystals perpendicular to the loading direction, and hence, to make the composites having the anisotropic microstructure.

用小试件后压痕的方法成功地测量了羟基磷灰石(HAP)多晶的疲劳参数与酸性溶液中pH的关系，并测量了与陶瓷中断裂起始点长度相似的微裂纹的裂纹扩展行为，虽然测量的疲劳参数与压痕载荷有关，但其数值与已有的报道相似。用后压痕法测量了最小应力强度因子K_&lt；结果表明，热压法制备的70wt%HAP-30wt%聚乳酸复合材料的体积密度与骨密度相近，是一种无气孔的制备方法。对于含有30wt%聚乳酸的HAP2复合材料，可以使HAP晶体垂直于加载方向排列，从而使复合材料具有各向异性的微观结构。

项目成果

Nobukazu Wakamatsu: "Post-indentation slow crack growth of hydroxyapatite polycrystals in distillled water." Dental Materials Journal. (in press).

Nobukazu Wakamatsu：“羟基磷灰石多晶在蒸馏水中的压痕后缓慢裂纹生长。”

Nobukazu Wakamatsu: "Hot-pressing of hydroxyapatite-polylactic acid composites for artificial bone" Dental Materials Journal. (in press).

Nobukazu Wakamatsu：“用于人造骨的羟基磷灰石-聚乳酸复合材料的热压”《牙科材料杂志》。

Nobukazu Wakamatsu: "Post-indentation slow crack growth of hydroxyapatite polycrystals in distilled water" Dental Materials Journal. (in press).

Nobukazu Wakamatsu：“蒸馏水中羟基磷灰石多晶的压痕后缓慢裂纹生长”《牙科材料杂志》。

Nobukazu Wakamatsu: "Hot-pressing of hydroxy-apatite-polylactic acid composites for artificial bone." Dental Materials Journal. (in press).

Nobukazu Wakamatsu：“用于人造骨的羟基磷灰石聚乳酸复合材料的热压。”