3种半透性测量指标的比较性研究

发布时间：2018-04-06 02:13

本文选题：半透性　切入点：透射率　出处：《华西口腔医学杂志》2017年03期

【摘要】：目的研究牙科领域中透射率(T)、透射系数(TP)、对比系数(CR)3种常用半透性测量指标的相互关系。方法制作Vita体瓷和釉瓷试件各6个,起始厚度为1.2 mm,逐渐打磨至1.0、0.8、0.6、0.4、0.2 mm,用PR-650型光谱扫描色度仪分别测量每个厚度下的T值、黑白背景前的颜色参数、黑白背景前的反射率,比较3种半透性测量指标T、TP、CR的关系。结果 T与厚度之间呈指数关系,随着厚度的减小T值明显升高;TP值随试件厚度减小而升高,接近于直线关系;CR值随试件厚度减小而降低,接近于直线关系。不同厚度试件的T、TP、CR,除釉质瓷1.2 mm组与1.0 mm组的T值无统计学差异外,其余各组结果之间均有统计学差异。3项指标的变异系数(CV)无统计学差异。TP与T、CR与T之间均为指数关系,拟合优度分别为0.951和0.939,具有统计学意义(P0.05)。结论在本实验条件下,T、TP、CR这3种半透性的测量指标具有相同的离散度,T与TP、T与CR均为指数关系,TP和CR的测量结果不能准确地反映不同材料之间半透性差异的大小。
[Abstract]:Objective to study the relationship among three commonly used semi-permeable measurement indexes in the field of dentistry, I. e., transmissivity, transmission coefficient (TX), transmission coefficient (TP), and contrast coefficient (CR).Methods six samples of Vita body and six samples of glazed porcelain were made, the initial thickness was 1.2mm, and the thickness was gradually polished to 1.0mm 0.80.6U 0.40.2.The T value of each thickness, the color parameters before black and white background, and the reflectivity before black and white background were measured by PR-650 spectroscopic scanning colorimeter.To compare the relationship of three semi-permeability measurement indexes (TGTPN CR).Results there was an exponential relationship between T and thickness. With the decrease of thickness, the value of TP increased with the decrease of the thickness of the specimen, and the value of CR decreased with the decrease of the thickness of the specimen, and the value of CR was close to the linear relationship with the decrease of the thickness of the specimen.There was no significant difference in T value between the enamel porcelain 1.2 mm group and 1.0 mm group, but there was no significant difference in the coefficient of variation (CVV) between the other three groups. There was no significant difference between TP, TCR and T, and there was an exponential relationship between TP and Tncr and T.The goodness of fit was 0.951 and 0.939, respectively, with statistical significance (P 0.05).Conclusion under this experimental condition, the three semi-permeable indexes of TTP / TPN CR have the same dispersion degree T and TPN T and CR are exponential relationship. The measured results of TP and CR can not accurately reflect the difference of semi-permeability between different materials in this experiment. [WT5 "HZ] [WT5" HZ] [WT5 "BZ] the results of this experiment show that the three semi-permeable indexes have the same dispersion degree.
【作者单位】：口腔疾病研究国家重点实验室国家口腔疾病临床研究中心四川大学华西口腔医院修复科;口腔疾病研究国家重点实验室国家口腔疾病临床研究中心四川大学华西口腔医院口腔颌面外科;
【基金】：四川省科技支撑计划(2014FZ0073,2014SZ0019-8)~~
【分类号】：R783.1

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