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

Laser Raman Micro-spectroscope Observation for the Analysis of Resin-dentin Interdiffusion Zone

激光拉曼显微光谱观察分析树脂-牙本质相互扩散区

基本信息

批准号：
14571826
负责人：
MIYAZAKI Masashi
金额：
$ 2.18万
依托单位：
Nihon 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

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-14571826/
关键词：
Hybrid Layer Dentin Bonding Raman Microscope Resin penetration Bonding Mechanism レジン浸透性

项目摘要

Adhesion of resin composites to tooth substrate is currently believed to rely on the infiltration of bonding resin into the porous zone, establishing micro-mechanical retention to etched surface. If adhesive resin does not penetrate the demineralized tooth substrate, then the porous layer within this layer will be exposed to oral fluids and vulnerable to degradation. The purpose of this study was to investigate the effect of self-etching primer application duration on resin penetration into dentin and dentin bond strength. After making bonded specimens, sectioned through the bonded interface. The sectioned surfaces were then polished with diamond pastes down to 1.0 μm particle size. Raman spectra were successively recorded along a line perpendicular to the tooth/resin interface. The sample stage was moved in steps of 0.2 μm on a computer controlled X-Y precision table. Additional spectra from samples of tooth and cured bonding resins were recorded for reference. The relative amounts of the hydroxyapatite (960cm-1,P-O), bonding agent (640cm-1,aromatic ring), and alkyl group (1450cm-1,C-H) in the enamel/resin bonding area were calculated. From the Raman spectroscopy, the widths of demineralized dentin increased with prolonged treatment time. The patterns of gradual transition of components were different among the groups. Furthermore, the tooth/resin interface represents a gradual transition of bonding agent from resin side to tooth side. From the results of this study, nonuniform resin infiltration into the etched enamel was detected and the degree of resin infiltration was different among the bonding systems used.

目前认为，树脂复合材料与牙齿基质的粘附依赖于粘结树脂渗透到多孔区，从而建立对蚀刻表面的微观机械保持。如果粘合剂树脂不能渗透脱矿牙齿基质，则该层内的多孔层将暴露于口腔流体并易于降解。本研究的目的是探讨自酸蚀底涂剂涂敷时间对树脂渗透到牙本质和牙本质粘结强度的影响。制作粘结试件后，沿粘结界面进行切片。然后用金刚石浆料将切片表面抛光至1.0 μm粒度。沿着垂直于牙齿/树脂界面的线连续记录拉曼光谱。样品台在计算机控制的X-Y精密工作台上以0.2 μm的步长移动。记录来自牙齿和固化粘结树脂样品的额外光谱以供参考。计算牙釉质/树脂粘接区中羟基磷灰石（960 cm ~（-1），P-O）、粘接剂（640 cm ~（-1），芳香环）和烷基（1450 cm ~（-1），C-H）的相对含量。从拉曼光谱可以看出，随着处理时间的延长，脱矿牙本质的宽度增加。各组间各成分的渐变模式不同。此外，牙齿/树脂界面代表粘合剂从树脂侧到牙齿侧的逐渐过渡。从这项研究的结果，不均匀的树脂渗透到蚀刻釉质检测和树脂渗透的程度是不同的粘结系统。