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牙本质湿粘接的界面和强度研究

Interface and Strength Study of Dentin Bonding with Wet-bonging Technical

【作者】 李潇

【导师】 施长溪; 赵信义;

【作者基本信息】 第四军医大学 , 口腔临床医学, 2000, 博士

【摘要】 牙齿粘接是口腔修复中一个重要的组成部分,并广泛地应用于口腔修复的临床实践。牙本质由于本身具有的结构特点,对它的粘接一直是牙齿粘接研究的难点和热点。本文回顾了牙本质粘接剂和牙本质粘接机理的研究历程,应用宏观的微拉力测试方法和微观的扫描电镜、透射电镜以及激光扫描共聚焦显微镜技术,对目前的牙本质湿粘接技术的粘接机理和影响因素做了较为系统的研究,对于不同类型的牙本质粘接剂在不同粘接条件下的强度和粘接界面形态进行了比较、分析,为这一技术在临床的合理应用和今后更为理想的粘接系统的研制,提供了一定的理论依据,并对合理使用目前的形态观察和强度测试方法进行了初步的探讨。 微拉力测试方法可以最大限度的避免牙本质或复合树脂内聚力破坏对牙本质粘接强度测试结果的影响,更为客观的反映粘接系统本身的特性。 应用扫描电镜和透射电镜方法,能对牙本质粘接界面的超微结构进行详细的观察和分析,而用激光扫描共聚焦显微镜则可以较为全面的反映牙本质粘接界面的形态结构。 将宏观的微拉力强度测试和微观的扫描电镜、透射电镜以及激光扫描共聚焦显微镜技术相结合,可以对牙本质湿粘接的机理和影响因素进行更为客观和系统的综合分析。 在牙本质湿粘接过程中,以丙酮为溶剂的粘接系统的微拉伸强度,高于以酒精和水为溶剂的粘接系统;虽然二者的粘接界面中都可以观察到粘接剂在牙本质表面充分的渗透,但后者有着更为明显的过度润湿现象。 干燥粘剂时,微拉伸强度下降,以丙酮为溶剂的粘接系统的粘接界面中有明显的不完全渗透现象,而以酒精和水为溶剂的粘接系统的粘接界面的形态没有明显的变化。 随着酸蚀剂浓度的降低,牙本质湿粘接的微拉伸强度有增高的趋势,但在牙本质粘接界面的微观结构中没有观察到明显的区别。

【Abstract】 Tooth bonding is a major component of prosthodontics, and is widely used in clinical. Dentin bonding is always difficult due to its peculiar structure. This thesis reviews the study course of dentin bonding agent and bonding mechanism, and makes a systematic study on the bonding mechanism as well as affecting factors of wet-bonding technique using microtensile measurement, scanning electron microscope(SEM), transmission electron microscope(TEM) and laser scanning confocal microscope(LSCM), comparing and analyzing the bonding strength and interface morphology of different bonding systems, which have been used in different conditions. The results give some theoretical basis of rational using of wet-bonding technique and development of new bonding agent. It is also carrying out a preliminary exploration on the using of various dentin bonding research methods.Microtensile measurement can reduce the cohesive fracture of dentin or composite resin in the strength testing process to a minimum, so it can reflect the characteristic of bonding system more objective.It can give detailed observation and analysis of the ultramicrostructure in the dentin bonding interface using SEM and TEM, while LSCM can reflect it more completely.With the combination of microtensile measurement, SEM, TEM and LSCM, it can make objective and systematic analysis on the bonding mechanism and affecting factors affecting factors of wet-bonding technique.In the process of wet dentin bonding, acetone-based adhesives have higher microtensile strength than alcohol-water-based adhesives. Although two types of bonding system have full resin penetration in the bonding interface, the latter possess distinct overwet phenomenon.

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