权益分类	功能权益	普通用户	{{item.name}}会员
{{category.name}}	{{benefitItem.name}}

Effect of Treating Agents to the Exudation of Internal Fluids from Dentinal Tubules

治疗剂对牙本质小管内部液体渗出的影响

基本信息

批准号：
05807180
负责人：
SASAZAKI Hiromi
金额：
$ 0.83万
依托单位：
TOHOKU 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：
1993
资助国家：
日本
起止时间：
1993 至 1994
项目状态：
已结题

项目摘要

Exudation of internal fluids from dentinal tubules on the freshly extracted and vital humans teeth was observed and the effect of etching to the exudation was studied on the ground dentin surfaces by SEM observation using precision replica method. Results were as follows :1. Many round prominences were observed on the dentin surfaces of the freshly extracted humans teeth and the vital humans teeth. The round and small concavities on the impression surfaces must be formed by the exuding pressure of the internal fluids from dentinal tubules during the setting to indicate the presence of these round prominences. This method was effective for observing the exudation of internal fluids from dentinal tubules in vitro and in vivo.2. The exudation was also observed on the unetched dentin surfaces when the impression material with fast setting time of 2 minutes was used. The quantity of exudation on the unetched dentin surfaces increased according to the prolonged setting time of the impression material But the exudation was not observed on the etched dentin surfaces when the impression material with the fast setting time of 2 minutes was used. The exudation was also observed on the etched dentin surfaces when the impression material with prolonged setting time was used. Etching of dentin to remove the smeared layr was effective to delay and lessen the exudation of internal fluids from dentinal tubules. These delay and decrescence of the exudation must be effective for the favorable adhesion of resinous materials to dentin.

采用精密复型法观察了新鲜离体牙和活髓牙的牙本质小管内液渗出情况，并在磨后牙本质表面观察了酸蚀对渗出的影响。结果如下：1.在新鲜拔牙和活髓牙的牙本质表面观察到许多圆形的牙本质突起。印模表面上的圆形和小的凹陷必须由牙本质小管在固化过程中的内部流体的渗出压力形成，以指示这些圆形凹陷的存在。该方法可有效观察牙本质小管内液渗出情况.使用快速凝固时间为2min的印模材料时，未酸蚀牙本质表面也出现渗出。未酸蚀牙本质表面渗出量随印模材料凝固时间的延长而增加，而使用快速凝固时间为2min的印模材料时，在酸蚀牙本质表面未见渗出。使用凝固时间较长的印模材料时，牙本质酸蚀表面也出现渗出现象。酸蚀去除玷污层能有效延缓和减少牙本质小管内液的渗出。这些渗出的延迟和减少必须有效地促进牙本质材料与牙本质的良好粘附。