LASER ACOUSTIC EVALUATION OF DENTAL MATERIALS BONDING

牙科材料粘合的激光声学评估

• 批准号: 3425785
• 负责人: EVAN H GREENER
• 金额: $ 4.02万
• 依托单位: NORTHWESTERN UNIVERSITY AT CHICAGO
• 依托单位国家: 美国
• 财政年份: 1992
• 资助国家: 美国
• 起止时间: 1992-08-01 至 1994-07-31
• 项目状态: 已结题
• 来源: https://reporter.nih.gov/project-details/3425785
• 关键词: biomaterial evaluation; composite resins; dental bonding material; dentin; lasers; sound; technology /technique; tensile strength

This pilot study attempts to evaluate, for dental materials use, a new technique called the laser acoustic emission thermal technique, (LAETT). This procedure has been successfully used to study the bond strength between graphite fibers in an epoxy matrix, but may be appropriate to locally quantify the filler/matrix interaction in dental composite materials as well as the bonding strength between dentin bonding agent and dentin. Inherent in LAETT may be the ability, in dental composites, to localize the investigation of the fiber/matrix interface thus removing the contribution from the resin matrix. This is important in attempting to explain the change in strength values and wear in composites when subjected to oral fluids. Applied to dentin bonding, LAETT may be able to localize the bonding agent interface and thus eliminate the confounding effect of the macroscopic shear bond strength test which needs to incorporate a composite/bonding agent interface to obtain strength values. Results obtained With LAETT will be compared with those obtained by conventional techniques, which include the compressive and diametral tensile tests in the case of composites, and shear strength measurements in the case of dentin bonding, to determine the extent of correlation. It is the objective of this work to determine if quantitative measurements in dental composites and dentin bonding can actually be made by (LAETT). Both conventional and LAETT techniques will be applied in this pilot study to quantify the effects in the filler/matrix interfacial bonding strengths of model dental composites produced by altering the volume fraction and silanation of fillers as well as through the accelerated degradation of filler/matrix interfacial bonds under the oral simulating environments. In addition, both conventional and LAETT test methods will be applied to quantify the dentin bonding strengths of commercial dentin bonding agents and their degradation under saline solution storage.

这项初步研究试图评估，牙科材料的使用，一个新的 这种技术称为激光声发射热技术（LAETT）。 该程序已成功地用于研究粘结强度 在环氧树脂基体中的石墨纤维之间，但是可以适当地 局部量化牙科复合材料中填料/基质的相互作用 材料以及牙本质粘接剂之间的粘接强度 和牙本质。 LAETT固有的可能是牙科复合材料的能力， 为了使纤维/基质界面的研究局部化， 来自树脂基质的贡献。 这对于尝试 为了解释复合材料的强度值和磨损的变化， 口服液体。 应用于牙本质粘接，LAETT可能能够 为了使粘合剂界面局部化， 宏观剪切粘结强度试验的混杂效应， 需要结合复合材料/粘合剂界面以获得 强度值。 LAETT获得的结果将与 传统的技术，包括压缩和直径 复合材料的拉伸试验和剪切强度测量 在牙本质粘结的情况下，以确定相关性的程度。 这项工作的目的是确定是否定量 实际上，可以对牙科复合材料和牙本质粘结进行测量， ”（《礼记》）。 在这个试点中将采用传统和LAETT技术 研究以量化填料/基质界面结合的影响 通过改变体积制备的模型牙科复合材料的强度 分级和硅烷化的填料，以及通过加速 口腔模拟条件下填料/基质界面结合的降解 环境. 此外，常规和LAETT测试方法将应用于 量化市售牙本质粘结剂的牙本质粘结强度 以及它们在盐溶液储存下的降解。