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.

为了减少树脂的聚合收缩应力并在直接的树脂核心恢复中降低树脂核心，我们提出了将Mega-Filler插入核心的新树脂核心堆积系统。用MDP单体处理的硅烷化氧化铝（AL_2O_3 93％/SIO_2 5％）和不锈钢（SUS304）球用作大型填料（3或4 mMφ）。测量了带有或没有大型填充剂的圆柱树脂内核（5mmφ×8mm）的抗压强度（CS），弹性模量（EM）和屈服应力（Ys），以评估大型填充剂的增强作用。尽管具有大型填充物的树脂内核的CSS几乎等于树脂核心本身的CS，但带有大型填充物的树脂内核的EMS和YS明显高于树脂核心本身。这意味着与树脂核心仅相比，具有大型填充剂的树脂核心很难变形，建议插入大型填充剂有效地提高树脂核心的耐用性。直径5mm的腔和5mm的腔体在牛根中制备了5mm的渗入，并用核心牙齿的牙齿和核心树脂仅与芯片固定或与树脂固定或恢复与树脂和兆头和Mega和Mega和Mega-Fillers恢复。将所有已修复的样品应用于热循环测试（分别为1分钟，在4℃和55°的水中为1分钟），持续5,000或10,000次，并分为一半。使用立体光学显微镜观察到截面的表面，并检查了树脂核与腔壁之间存在差距。对于仅核树脂组，在许多样品中发现了树脂和牙本质之间的缝隙形成。从这些结果中，建议大型填料的插入减少聚合和热收缩应力，并提高直接树脂核心修复体的密封能力和粘合耐用性。