Yin Xiao-Jie, Wei Bang-Yan, Ke Xiu-Ping, Zhang Ting, Jiang Meng-Yang, Luo Xia-Yan, Sun Hui-Qiang
Department of Prosthodontics, School of Stomatology, Shandong University, Jinan, 250012, Shandong, China.
Shandong Key Laboratory of Oral Tissue Regeneration & Shandong Engineering Laboratory for Dental Materials and Oral Tissue Regeneration, Jinan, Shandong, China.
BMC Oral Health. 2020 Feb 19;20(1):59. doi: 10.1186/s12903-020-1040-x.
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.
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).
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.
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.
在本研究中，我们对上颌前牙（MAT）的牙冠和牙龈形态（CGM）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，旨在为PB诊断提供客观标准。
使用口腔内扫描仪获取56名个体的三维（3D）上颌数字模型。使用SpaceClaim软件测量以下参数：牙龈角（GA）、龈乳头宽度（PW）、龈乳头高度（PH）、牙冠长度（CL）、牙冠宽度（CW）、牙冠宽度/牙冠长度比（CW/CL）、牙冠颊舌径（BLW）、接触区宽度（CSW）以及接触区高度/牙冠长度比（CS/CL）。根据牙周探针透过龈沟的透明度确定PB。通过逻辑回归分析影响PB的独立因素，并使用受试者工作特征曲线（ROC曲线）分析独立影响因素的最佳截断值。
MAT左右两侧的CGM参数无显著差异。厚生物型占69.6%，GA、PW、PH、CW、CW/CL和CS/CL参数与PB显著相关（P≤0.2）。GA（优势比（OR）=1.206）和PW（OR=5.048）被确定为PB的独立预测因素，ROC曲线下面积（AUC）分别为0.807和0.881，最佳截断值分别为95.95°和10.01mm。
MAT左右两侧的CGM是对称的。薄生物型占比小，GA和PW是PB的独立影响因素。95.95°的GA和10.01mm的PW是将个体归类为厚生物型的最佳截断值。这表明当上颌中切牙右侧的GA≥95.95°且PW≥10.01mm时，这些个体被归类为厚生物型的可能性更高。
