BACKGROUND In this study, we conducted a quantitative analysis of the clinical parameters of crown and gingival morphology (CGM) of the maxillary anterior teeth (MAT). We also analyzed the correlation of these parameters with periodontal biotype (PB), with a view to providing objective standards for PB diagnosis. METHODS The three-dimensional (3D) maxillary digital models of 56 individuals were obtained using an intra-oral scanner. The following parameters were measured with the SpaceClaim software: gingival angle (GA), papilla width (PW), papilla height (PH), crown length (CL), crown width (CW), crown width/crown length ratio (CW/CL), bucco-lingual width of the crown (BLW), contact surface width (CSW), and contact surface height/crown length ratio (CS/CL). The PB were determined based on the transparency of the periodontal probe through the gingival sulcus. Independent factors influencing PB were analyzed by logistic regression, and the optimal cutoff values for the independent influencing factors were analyzed using receiver operating characteristic curves (ROC curves). RESULTS There was no significant difference in the parameters of CGM of the MAT at the left and right sides. The thick biotype accounted for 69.6%, and the parameters of GA, PW, PH, CW, CW/CL and CS/CL were significantly correlated with PB (P ≤ 0.2). GA (odds ratio (OR) = 1.206) and PW (OR = 5.048) were identified as independent predictive factors of PB, with areas under the ROC curve (AUC) of 0.807 and 0.881, respectively, and optimal cutoff values of 95.95° and 10.01 mm, respectively. CONCLUSION The CGMs of the MAT at the left and right side are symmetrical. The thin biotype accounts for a small proportion, and GA and PW are independent influencing factors of PB. GA of 95.95° and PW of 10.01 mm are the optimal cutoff values for categorization of individuals as thick biotype. This indicates that when the GA and PW of the right maxillary central incisor are G ≥ 95.95° and ≥ 10.01 mm, respectively, there is a higher probability that these individuals will be categorized as thick biotype.

中文翻译：

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前牙冠和牙龈形态的临床参数与牙周生物类型之间的相关性。

背景技术在这项研究中，我们对上颌前牙（MAT）的冠和牙龈形态（CGM）的临床参数进行了定量分析。我们还分析了这些参数与牙周生物型（PB）的相关性，以期为PB诊断提供客观标准。方法使用口腔内扫描仪获得56位个体的三维（3D）上位数字模型。使用SpaceClaim软件测量以下参数：牙龈角（GA），乳头宽度（PW），乳头高度（PH），牙冠长度（CL），牙冠宽度（CW），牙冠宽度/牙冠长度比（CW / CL） ），冠的颊舌宽度（BLW），接触面宽度（CSW）和接触面高度/冠长比（CS / CL）。PB是根据牙龈探针通过牙龈沟的透明度确定的。通过Logistic回归分析影响PB的独立因素，并使用接收器工作特征曲线（ROC曲线）分析独立影响因素的最佳临界值。结果MAT的CGM参数在左右两侧没有显着差异。厚生物型占69.6％，GA，PW，PH，CW，CW / CL和CS / CL的参数与PB显着相关（P≤0.2）。GA（奇数比（OR）= 1.206）和PW（OR = 5.048）被确定为PB的独立预测因素，ROC曲线（AUC）下的面积分别为0.807和0.881，最佳截止值为95.95°和10.01毫米 结论MAT的CGM在左右两侧是对称的。稀薄的生物型占很小的比例，GA和PW是PB的独立影响因素。GA为95.95°，PW为10.01 mm是将个体分类为厚生物型的最佳临界值。这表明，当右上颌中切牙的GA和PW分别为G≥95.95°和≥10.01 mm时，这些个体被归类为厚生物型的可能性更高。