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Development of new method for root canal filling using the shape memory polymer

使用形状记忆聚合物开发根管充填新方法

基本信息

批准号：
14571818
负责人：
TSUKADA Gakuji
金额：
$ 2.24万
依托单位：
Kagoshima University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2002
资助国家：
日本
起止时间：
2002 至 2004
项目状态：
已结题

项目摘要

The shape memory polymer was produced by using the closs-linked gutta percah (trans polyisoprene). The Sulfur and Dicumyl peroxide were compounded for cross-linking agent, Zinc oxide and Stearic acid were compounded for cross-linking promoter. The mechanism of shape memory for closs-linked gutta percah was proved following. The test specimen that was memorized for original shape by cross-linking could be deformed easily by heating at over the transition temperature. This deformed specimen was cooled at under the transition temperature and the shape of specimen was fixed by crystallization by trans polyisoprene. The fixed shape could restore to original shape by means of the heating at over the transition temperature. This behavior was according to the melting of the crystallization of trans polyisoprene. The restoration temperature could be adjusted by the addition of cis polyisoprene or cross-linking agent. And the restoration temperature could be established at under the intra-oral temperature. As addition of the cross-linking agent increased the elastic modulus increased, and as addition of the cis polyisoprene increased the elastic modulus decreased. The point for root canal filling was produced by using the shape memory polymer and the sealing test was conducted using it. The canal for filling was used glass tube, root canal for bovine tooth and artificial root canal produced by acryl. The sealing test for glass tube using the shape memory polymer was shown superior sealing for eighteen months. The sealing test using the shape memory polymer was shown to be more superior to that using the vertical condensation method. The sealing test using the shape memory polymer for the artificial root canal which was enlarged by using #130 reamer was showed to be superior sealing.

形状记忆聚合物是由克洛斯连接的杜仲胶(反式聚异戊二烯)制备的。以硫磺和过氧化二异丙苯为交联剂，氧化锌和硬脂酸为交联剂。研究了Coss-Linking牙胶的形状记忆机理。通过交联法存储原始形状的试件，在超过转变温度时，容易发生变形。变形的样品在转变温度以下冷却，样品的形状由反式聚异戊二烯结晶固定。通过超过转变温度的加热，可以使固定的形状恢复到原来的形状。这一行为与反式聚异戊二烯结晶的熔融有关。可通过添加顺式聚异戊二烯或交联剂来调节修复温度。修复温度可设定在口内温度以下。随着交联剂加入量的增加，弹性模量增加，而随着顺式聚异戊二烯加入量的增加，弹性模量降低。用形状记忆聚合物制作根管充填点，进行根管封闭性试验。根管充填采用玻璃管、牛牙根管和Acryl公司生产的人工根管。用形状记忆聚合物对玻璃管进行的密封试验表明，18个月的密封效果良好。结果表明，形状记忆聚合物的密封性能优于垂直冷凝法。用形状记忆聚合物对用#130铰刀扩大的人工根管进行封闭性试验，结果显示封闭性较好。