In vivo spectrophotometric evaluation of pure enamel and enamel-dentine complex in relationship with different age groups
In vivo spectrophotometric evaluation of pure enamel and enamel-dentine complex in relationship with different age groups
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DOI：
10.1016/j.jdent.2013.09.005
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发表时间：
2013-12-01
影响因子：
4.4
通讯作者：
Ardu, Stefano
中科院分区：
文献类型：
--
作者：
Mayoral, Juan R.;Arocha, Mariana A.;Ardu, Stefano
目的：本体内研究的目的是探讨年龄对纯牙釉质和牙釉质-牙本质复合物光学性质的影响。方法：对两个不同年龄组：年轻（10-35 岁）和成人（36-60 岁）进行分光光度研究。在两组中，记录右上中切牙的牙齿总面积。检测2mm厚纯牙釉质和3mm牙釉质-牙本质复合体的面积，并评估其L*a*b*和CR。结果：年轻组2mm纯牙釉质中位数为L*74.8、a*3.1、b*15.1，白色背景；黑色背景下的 L*65.5、a*0.9、b*10.3。相应的不透明度为75%。在成人组中，白色背景下的中位数为 L*70.0、a*4.1、b*15.4；和L*61.2、a*1.6、b*9.6，黑色背景。相应的不透明度为75%。对于 3 mm 牙釉质-牙本质复合体，年轻组在白色背景下的中位数为 L*77.8、a*3.0、b*19.8；和 L*74.2、a*1.1、b*15.9，黑色背景。相应的不透明度为89%。在成人组中，白色背景下的中位数为 L*73.4、a*4.0、b*18.5；以及黑色背景下的 L*71.0、a*2.0 和 b*15.3。相应的不透明度为90%。讨论：将该方法应用于更大的不同年龄组受试者，可以作为更准确表征天然牙釉质和牙本质光学特性的数据库。结论：牙釉质中的L*值，以及3毫米厚牙釉质-牙本质复合物和2毫米纯牙釉质的a*值在年轻组中显着较高。临床意义：白色和黑色背景下牙釉质的 L* 和 a* 值在所考虑的 2 个年龄组内存在统计学差异。牙釉质牙本质复合体的白色背景上的 L* 值和黑色背景上的 a* 值似乎随着年龄而变化。在本研究考虑的两个年龄组内，牙釉质或牙釉质牙本质复合体的不透明度（CR）没有变化。 (C) 2013 Elsevier Ltd. 保留所有权利。
Objective: The aim of this in vivo study was to investigate the influence of age on optical properties of pure enamel and enamel-dentine complex.Methods: A spectrophotometric study was performed on two different age groups: young (10-35 years old) and adult (36-60 years old). In both groups, the tooth's total area of the upper right central incisor was recorded. Areas of 2 mm thick pure enamel and 3 mm enamel-dentine complex were detected and their L*a*b* and CR evaluated.Results: For 2 mm pure enamel medians in the young group were L*74.8, a*3.1, b*15.1, against white background; and L*65.5, a*0.9, b*10.3 against black background. The correspondent opacity was 75%. In the adult group medians were L*70.0, a*4.1, b*15.4 against white background; and L*61.2, a*1.6, b*9.6, against black background. The correspondent opacity was 75%. For 3 mm enamel-dentine complex medians in the young group were L*77.8, a*3.0, b*19.8 against white background; and L*74.2, a*1.1, b*15.9, against black background. The correspondent opacity was 89%. In the adult group medians were L*73.4, a*4.0, b*18.5 against white background; and L*71.0, a*2.0, and b*15.3 against black background. The correspondent opacity was 90%.Discussion: The application of this method on a larger group of subjects of different ages may serve as a database for a more exact characterization of optical properties of natural enamel and dentine.Conclusions: L* values in enamel, as well as a* value of 3 mm thick enamel-dentine complex and 2 mm pure enamel were significantly higher in the young age group. Clinical significance: L* and a* values of enamel over white and black backgrounds were statistically different within the 2 age groups considered. L* values over white background and a* values over black background of the enamel dentine complex seem to change with age. The opacity (CR) for enamel nor for enamel dentine complex does not change within the two age groups considered in this study. (C) 2013 Elsevier Ltd. All rights reserved.