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

Artificial Enamel : Preparation and Evaluation.

人造牙釉质：制备和评估。

基本信息

批准号：
11470403
负责人：
NAKABAYASHI Nobuo
金额：
$ 3.97万
依托单位：
Tokyo Medical and Dental University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B).
财政年份：
1999
资助国家：
日本
起止时间：
1999 至 2000
项目状态：
已结题

项目摘要

Preparation of hybridized dentin is a key to make bonding of resin to dentin possible. The purpose of this study was to compare efficacy of dissolved various valent cations in 10% phosphoric acid on wet bonding to dentin. It was hypothesized that addition of multivalent cation in etchant could improve the monomer permeability of wet demineralized dentin that would make the bond strength higher. Bovine dentin prepared with 600-grid paper was etched with 10% phosphoric acid dissolved 22.0mM sodium chloride (Na), calcium chloride (Ca) or ferric chloride (Fe) for 10s. The specimens were rinsed and blot-dried. They were primed with 5% 4-META in acetone for 60 s three times. And then a MMA-TBB resin was applied. Mini-dumbbell test specimens were trimmed from the bonded samples.Through a study of bonding to dentin it was realized that demineralized dentin not protected by interpenetration resin can easily be affected by hydrolysis, which we call secondary caries. Once enamel is removed, dentin is exposed to the outside and is vulnerable to caries, and pulp is also exposed to the outside through tubles in the exposed dentin. Then microorganisms invade the pulp easily ; this we call hypersensitive dentin. Microleakage and secondary caries have been very important problems to be solved in dentistry. When we can provide an impermeable membrane like enamel on the exposed dentin, it must be very effective to protect dentin from cariesand pulp from invasion of microorganisms.

杂化牙本质的制备是使树脂与牙本质粘合成为可能的关键。本研究的目的是比较 10% 磷酸中溶解的各种价阳离子对牙本质湿粘合的功效。据推测，在蚀刻剂中添加多价阳离子可以改善湿脱矿牙本质的单体渗透性，从而使结合强度更高。用600格纸制备的牛牙本质用溶解有22.0mM氯化钠(Na)、氯化钙(Ca)或氯化铁(Fe)的10%磷酸蚀刻10s。将样本漂洗并吸干。他们用 5% 4-META 的丙酮溶液灌注 3 次，每次 60 秒。然后应用MMA-TBB树脂。从粘结样品上剪下迷你哑铃测试标本。通过对牙本质的粘结研究发现，没有互穿树脂保护的脱矿牙本质很容易受到水解的影响，我们称之为继发龋。一旦牙釉质被去除，牙本质暴露在外面，很容易产生龋齿，牙髓也通过暴露的牙本质中的小管暴露在外面。微生物很容易侵入果肉；我们称之为过敏性牙本质。微渗漏和继发龋一直是牙科亟待解决的重要问题。当我们能够在暴露的牙本质上提供一层像牙釉质一样的不渗透膜时，它一定能够非常有效地保护牙本质免受龋齿和牙髓免受微生物的侵袭。