Maestría en Endodoncia, Universidad Autónoma de San Luis Potosí, S.L.P., México.
Doctorado Institucional en Ingeniería y Ciencia de Materiales, Universidad Autónoma de San Luis Potosí, S.L.P., México.
P R Health Sci J. 2021 Jun;40(2):75-80.
The objective of this study was to determine the age-related anatomical changes that take place at the cementodentinal junction (CDJ).
Eighty-four teeth were extracted; 42 samples came from patients ranging in age from 18 to 30 years, and 42 came from patients aged from 40 to 60 years. Upper and lower and anterior and posterior teeth were included. Longitudinal slices were made, and 1% toluidine blue was used to stain all the samples prior to microscopic examination. Anatomical landmarks (apical foramen [AF], apical vertex, and cementoenamel junction) in the apical third were identified, and a pre-calibrated software package was employed to take digital measurements. Statistical analysis was performed by means of the Wilcoxon rank-sum test.
The data obtained showed that there were anatomical variations in the apical third in the older patients and that these changes were related to the age of the patient. Narrower root canals and smaller CDJ diameters were found in older patients' samples.
The results of this study suggest that instrumentation and obturation should take place 1 mm from the AF in older patients, and not 0.5 mm, as is usually recommended.
本研究旨在确定牙本质-牙骨质界（CDJ）的年龄相关解剖变化。
共 84 颗牙齿被拔出；42 个样本来自年龄在 18 至 30 岁之间的患者，42 个样本来自年龄在 40 至 60 岁之间的患者。包括上下前牙和后牙。制作纵切片，用 1%甲苯胺蓝对所有样本进行染色，然后进行显微镜检查。在根尖的第三个部分识别解剖学标志（根尖孔 [AF]、根尖顶点和牙骨质-釉质交界），并使用经过预校准的软件包进行数字测量。通过 Wilcoxon 秩和检验进行统计分析。
获得的数据表明，老年患者根尖的第三个部分存在解剖学变异，这些变化与患者的年龄有关。老年患者样本的根管较窄，CDJ 直径较小。
本研究结果表明，在老年患者中，器械和充填应在距离 AF 1mm 的位置进行，而不是通常建议的 0.5mm。
