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Construction of new resin core restoration system using mega-filler

使用巨型填料构建新型树脂核心修复系统

基本信息

批准号：
15592081
负责人：
HIRABAYASHI Shigeru
金额：
$ 2.3万
依托单位：
Tsurumi University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2003
资助国家：
日本
起止时间：
2003 至 2004
项目状态：
已结题

项目摘要

In order to decrease the polymerization shrinkage stress of resin and reinforce resin core in a direct resin core restoration, we proposed the new resin core build-up system with inserting of mega-filler into core. The silanated alumina (Al_2O_3 93%/SiO_2 5%) balls and stainless steel (SUS304) balls treated with MDP monomer were used as mega-filler (3 or 4 mm φ). The compressive strength(CS), elastic modulus(EM) and yield stress(YS) of cylindrical resin cores (5mmφ×8mm) with or without mega-filler were measured to evaluate the reinforcing effect of mega-filler. Although the CSs of resin cores with mega-filler were almost equal to that of resin core itself, the EMs and YSs of resin cores with mega-filler were significantly higher than that of resin core itself. This means that the resin core with mega-filler is hard to deform comparing to resin core only and it is suggested that the inserting of mega-filler is effective to improve the durability of resin core.The cavities of 5mm in diameter and 5mm in depth were prepared in bovine tooth roots and restored with core resin only or with resin and mega-filler. All restored samples were applied to a thermal cycling test (for 1min each in 4℃ and 55℃ water) for 5,000 or 10,000 times and sectioned in halves. The sectioned surface was observed with a stereo optical microscope and the existence or absence of gap between resin core and cavity wall was examined. For core resin only group, the gap formations between resin and dentin in portions near to cavity floor were found in many samples. For mega-filler group, no gap formation was found in any samples. From these results, it is suggested that the inserting of mega-filler decrease polymerization and thermal shrinkage stresses and improve sealing ability and bonding durability of direct resin core restorations.

为了在直接树脂核修复中减小树脂的聚合收缩应力，增强树脂芯，我们提出了在树脂芯中插入巨型填料的新的树脂芯构建系统。采用硅烷化氧化铝(Al_2O_3 93%/SiO_2 5%)球和不锈钢(SUS304)球作为超细填料(3 mm和4 mmφ)。为评价超细填料的增强效果，测定了5 mmφ×8 mm圆柱形树脂芯材的压缩强度(CS)、弹性模量(EM)和屈服应力(YS)。虽然含有巨型填料的树脂芯与树脂芯本身的CSS基本相同，但含有巨型填料的树脂芯的EM和YSS显著高于树脂芯本身。在牛牙根管内制备直径5 mm、深度5 mm的空洞，分别用纯树脂或树脂+巨型填充剂进行修复。将所有修复的样品进行5,000或10,000次的热循环试验(在4℃和55℃的水中各1分钟)，并将其一分为二。用立体光学显微镜观察切面，观察树脂芯与型腔壁间有无间隙。单纯核心树脂组，树脂与牙本质在接近窝洞底面的部分有间隙形成。对于巨型填料基团，所有样品均未发现缝隙形成。结果表明，巨型填料的加入降低了聚合力和热收缩应力，提高了直接树脂核修复体的封闭性和粘结耐久性。