Integrated correlation analysis of the thickness of the buccal bone and gingiva of the maxillary incisors

Objective: The purpose of this study was to validate the integrated correlation between the thickness of the buccal bone and the gingiva of the anterior maxilla and to gain insight into the reference plane selection when measuring these two tissues before treatment with implants. Methodology: CBCT and model scans of 350 included human subjects were registered in coDiagnostiX software to obtain sagittal maxillary incisor sections. The buccal bone thickness was measured at the coronal (2, 4 and 6 mm apical to the cementoenamel junction (CEJ)) and apical (0, 2 and 4 mm coronal to the apex plane) regions. The buccal gingival thickness was measured at the supra-CEJ (0, 1mm coronal to the CEJ) and sub-CEJ regions (1, 2, 4 and 6 mm apical to the CEJ). Canonical correlation analysis was performed for intergroup correlation analysis and the investigation of key parameters. Results: The mean thicknesses of the buccal bone and gingiva at different levels were 0.64~1.88 mm and 0.66~1.37 mm, respectively. There was a strong intergroup canonical correlation between the thickness of the buccal bone and that of the gingiva (r=0.837). The thickness of the buccal bone and gingiva at 2 mm apical to the CEJ are the most important indices with the highest canonical correlation coefficient and loadings. The most and least prevalent subgroups were the thin bone and thick gingiva group (accounting for 47.6%) and the thick bone and thick gingiva group (accounting for 8.6%). Conclusion: Within the limitations of this retrospective study, the thickness of the buccal bone is significantly correlated with that of the buccal gingiva, and the 2 mm region apical to the CEJ is a vital plane for quantifying the thickness of these two tissues.

研究目的：本研究的目的是验证颊骨厚度与前牙上颌牙龈之间的整合相关性，并深入探讨在植入治疗前测量这两种组织时参考平面的选择。研究方法：将350名受试者的CBCT和模型扫描在coDiagnostiX软件中进行配准，以获取上颌尖牙的矢状切片。在冠部（距牙本质-釉质界2、4和6毫米处）和根尖部（距牙尖平面0、2和4毫米处）区域测量颊骨厚度。在牙本质-釉质界上方（距牙本质-釉质界0、1毫米处）和下方（距牙本质-釉质界1、2、4和6毫米处）区域测量颊牙龈厚度。进行典型相关分析以进行组间相关性分析和关键参数的调查研究。结果：不同水平颊骨和牙龈的平均厚度分别为0.64~1.88毫米和0.66~1.37毫米。颊骨厚度与牙龈厚度之间存在显著的典型相关（r=0.837）。距牙本质-釉质界2毫米处的颊骨和牙龈厚度是最重要的指标，具有最高的典型相关系数和载荷。最常见和最少见的亚组分别为薄骨厚牙龈组（占47.6%）和厚骨厚牙龈组（占8.6%）。结论：在本回顾性研究的限制范围内，颊骨厚度与颊牙龈厚度显著相关，距牙本质-釉质界2毫米处是量化这两种组织厚度的关键平面。