Faculty of Dentistry, University of São Paulo, Department of Social Dentistry, Avenue Professor Lineu Prestes, 2227, Cidade Universitária, 05508-000 São Paulo, SP, Brazil.
Forensic Sci Int. 2013 Sep 10;231(1-3):167-71. doi: 10.1016/j.forsciint.2013.05.001. Epub 2013 Jun 5.
In cases of identification of bones, skeletal segments or isolated bones, searching for biotypologic diagnostic data to estimate an individual's age enables comparing these data with those of missing individuals. Enamel, dentin and pulp undergo remarkable changes during an individual's life. The enamel becomes more mineralized, smoother and thinner, and deteriorates because of physiological and pathological factors. Dental pulp decreases in volume due to the deposition of secondary dentin; thus, the dentin becomes thicker with time. In natural teeth, the fluorescence phenomenon occurs in dentin and enamel and changes in those tissues may alter the expression of the natural tooth color. The aim of this study was to assess the correlation between age and teeth fluorescence for individuals from different age groups. The sample consisted of 66 randomly selected Brazilians of both genders aged 7-63 years old. They were divided into 6 groups: Group 1 - aged 7-12 years, Group 2 - aged 13-20 years, Group 3 - aged 21-30 years, Group 4 - aged 31-40 years, Group 5 - aged 41-50 years and Group 6 - aged between 51 and 63 years. Upper right or left central incisors were used for the study. Restored and aesthetic rehabilitated teeth were excluded from the sample. The measurement of tooth fluorescence was carried out via computer analysis of digital images using the software ScanWhite DMC/Darwin Systems - Brazil. It was observed that dental fluorescence decreases when comparing the age groups 21-30, 31-40, 41-50 and 51-63 years. The results also showed that there is a statistically significant difference between the groups 41-50 years and 21-30 years (p=0.005) and also among the group 51-63 years and all other groups (p<0.005). It can be concluded that dental fluorescence is correlated with age and has a similar and stable behavior from 7 to 20 years of age. It reaches its maximum expected value at the age of 26.5 years and thereafter decreases.
在鉴定骨骼、骨骼片段或孤立骨骼的情况下，寻找生物特征诊断数据来估计个体的年龄，可以将这些数据与失踪个体的数据进行比较。牙釉质、牙本质和牙髓在个体一生中会发生显著变化。牙釉质变得更加矿化、更光滑、更薄，并因生理和病理因素而恶化。由于继发性牙本质的沉积，牙髓体积减小；因此，随着时间的推移，牙本质会变厚。在天然牙齿中，牙本质和牙釉质会发生荧光现象，这些组织的变化可能会改变天然牙齿颜色的表达。本研究旨在评估不同年龄组个体的年龄与牙齿荧光之间的相关性。该样本由 66 名随机选择的巴西男女组成，年龄在 7-63 岁之间。他们被分为 6 组：第 1 组 - 7-12 岁，第 2 组 - 13-20 岁，第 3 组 - 21-30 岁，第 4 组 - 31-40 岁，第 5 组 - 41-50 岁，第 6 组 - 51-63 岁。右上或左上中切牙用于研究。修复和美学修复的牙齿被排除在样本之外。通过使用巴西 ScanWhite DMC/Darwin Systems 软件对数字图像进行计算机分析来测量牙齿荧光。观察到 21-30 岁、31-40 岁、41-50 岁和 51-63 岁组之间的牙齿荧光会降低。结果还表明，41-50 岁组与 21-30 岁组之间（p=0.005）以及 51-63 岁组与所有其他组之间（p<0.005）存在统计学差异。可以得出结论，牙齿荧光与年龄相关，7-20 岁时具有相似且稳定的行为。它在 26.5 岁时达到预期的最大值，然后下降。
