Strengthening of dental materials by compounding short glass fibers -Development of new dental cement

通过复合短玻璃纤维增​​强牙科材料-新型牙科粘固剂的开发

• 批准号: 12671889
• 负责人: KAWANO Fumiaki
• 金额: $ 1.86万
• 依托单位: The University of Tokushima
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2000
• 资助国家: 日本
• 起止时间: 2000 至 2002
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-12671889/
• 关键词: glass ionomer cement; glass short fiber; mechanical property; aspect ratio; reactivity; thermalstress; 熱サイクル; SEM; 微小引張り強さ; マイクロビッカース硬さ; CPSAガラス繊維; 曲げ強さ; サーマルサイクル

The purposes of this study was to determine if short fibers of CaO-P_2O_3-SiO_2-Al^2O_3 (CPSA) glass possessing a particular aspect ratio (length/diameter) could be used as a reinforcing agent for glass-ionomer cement, and to clarify the effect of the CPSA short fibers contained in the flexural strength of the glass-ionomer cement. The powder of a commercial glass-ionomer cement (not resin modified) was mixed with variously sized CPSA glass short fibers before mixing with the liquid of the glass-ionomer cement. The mixed powders containing 60 mass% CPSA glass short fibers (diameter ; 9.7±2.1 m, aspect ratio ; 5.0±0.9) obtained maximum values of 18 Mpa and 35 Mpa for the diametral tensile strength (DTS) and flexural strength (FS) of set cements, respectively, after 24 hours. These DTS and FS values were 1.8 and 4. 5 times larger, respectively, than those of the set glass-ion omer cement not containing short fibers. Moreover, it was found that the addition of CPSA glass short fibers was remarkably more effective in the strengthening than Electric glass (a typical glass fiber) short fibers. The results suggested that the CPSA glass short fibers acted as a reinforcing agent for strengthening the glass-ionomer cement, because of the shape of short fibers and reactivity between the mixing liquid and short fibers. Moreover an appreciable increase in strength with time stored in water and with thermal cycling was seen with glass-ionomer cement, with or without CPSA. Thermal stress did not have a serious influence on the mechanical properties of the glass-ionomer cement with CPSA. The glass-ionomer with CPSA may maintain better strength, and, thus, it may be a favorable material for clinical applications as cement for filling.

本研究的目的是确定具有特定长径比（长度/直径）的 CaO-P_2O_3-SiO_2-Al^2O_3 (CPSA) 玻璃短纤维是否可以用作玻璃离子水门汀的增强剂，并阐明 CPSA 短纤维对玻璃离聚物粘固剂弯曲强度的影响 将市售玻璃离聚物粘固剂（未改性树脂）的粉末与各种材料混合。在与玻璃离聚物粘固粉的液体混合之前，对CPSA玻璃短纤维进行分级。含有60质量％CPSA玻璃短纤维的混合粉末（直径；9.7±2.1m，长径比；5.0±0.9）获得最大值18。 24小时后，凝固水泥的径向拉伸强度（DTS）和弯曲强度（FS）分别为Mpa和35 Mpa。 FS 值分别比不含短纤维的凝固玻璃离子聚合物水泥大 1.8 和 4. 5 倍，此外，发现添加 CPSA 玻璃短纤维的强化效果明显更有效。结果表明，由于短纤维的形状以及混合液体与短纤维之间的反应性，CPSA 玻璃短纤维可作为增强玻璃离子水门汀的增强剂。此外，无论有或没有 CPSA，玻璃离聚物粘固剂的强度随着储存时间和热循环的增加而明显增加。热应力对具有 CPSA 的玻璃离聚物粘固剂的机械性能没有严重影响。具有CPSA的玻璃离聚物可以保持更好的强度，因此，它可能是临床应用的填充水泥的有利材料。