Conservative Department, College of Dentistry, University of Sulaimani, Sulaymaniyah, Iraq.
Sulaymaniyah General Directorate of Health, Sulaymaniyah, Iraq.
BMC Oral Health. 2023 Dec 6;23(1):971. doi: 10.1186/s12903-023-03639-y.
To measure adequate enamel thickness of maxillary incisors in planning enamel reduction for a porcelain laminate veneer restoration in relation to chronological age and sex by using cone beam computed tomography (CBCT) in an Iraqi subpopulation.
From 81 CBCT images, 324 maxillary incisors were examined. Enamel thickness was measured at both mesial and distal regions of the tooth in three different levels: cervical, middle, and incisal (occlusal) 1/3 at a sagittal section. Measurements were made for the following tooth areas using CBCT: facial enamel thickness at 1, 3, and 5 mm from the cementoenamel junction (CEJ), palatal enamel thickness at 5 mm from the CEJ (5 mm P), facial and palatal enamel thickness at the incisal edge (IFP), mid incisal enamel thickness (IET), and the incisal edge enamel-pulp distance (IEPD). Relationships of enamel thickness with age and sex were evaluated using Independent t-test, Mann-Whitney U-test and the Pearson correlation coefficient, a simple linear regression analysis used for statistical analysis.
Significant differences (P < 0.05) were found in terms of an inverse association between enamel thickness and chronological age at all measurements above the CEJ and the regression model for the mid-incisal enamel thickness was (R2 of 0.4). In contrast, there was an increase in IFP, palatal, and IPED enamel thickness with age. Also, significant differences were found in enamel thickness between males and females, the enamel being thicker in females in relation to facial enamel thickness, enamel palatal thickness above CEJ and IET, while for IEPD, the enamel thickness was greater in males compared to females.
The measurements for enamel thickness outcome variables in relation to chronological age revealed significant differences for each measured distance and there were statistically significant differences in enamel thickness between males and females at all measurements except at IFP. These results demonstrate that CBCT can be used for noninvasive, accurate measurements of enamel thickness in both sex.
通过锥形束计算机断层扫描（CBCT）在伊拉克亚群中，针对釉质减少量的瓷贴面修复，测量上颌切牙的适当釉质厚度，以年龄和性别为参照。
从 81 个 CBCT 图像中，检查了 324 颗上颌切牙。在矢状面的三个不同水平（颈部、中部和切端（咬合）1/3）测量牙的近中和远中区域的釉质厚度。使用 CBCT 对以下牙齿区域进行测量：从牙骨质牙釉质界（CEJ）1、3 和 5 毫米处的颊侧釉质厚度、CEJ 处 5 毫米的腭侧釉质厚度（5mmP）、切缘处的颊腭侧釉质厚度（IFP）、中切牙釉质厚度（IET）和切缘釉质牙髓距离（IEPD）。使用独立 t 检验、Mann-Whitney U 检验和 Pearson 相关系数评估釉质厚度与年龄和性别的关系，使用简单线性回归分析进行统计分析。
在所有 CEJ 以上的测量中，发现釉质厚度与年龄呈负相关，中切牙釉质厚度的回归模型为（R2 为 0.4），存在显著差异（P<0.05）。相反，IFP、腭侧和 IPED 釉质厚度随年龄增加。此外，男性和女性之间的釉质厚度存在显著差异，女性的颊侧釉质厚度、CEJ 以上的腭侧釉质厚度和 IET 较厚，而 IEPD 则为男性较女性较厚。
与年龄相关的釉质厚度测量结果变量显示出每个测量距离的显著差异，在所有测量中，男性和女性的釉质厚度存在统计学差异，除 IFP 外。这些结果表明，CBCT 可用于非侵入性、准确测量男女两性的釉质厚度。
