Shrestha Rachana, Liu Xin, Chen Shoucheng, Li Zhipeng, Chen Zetao, Pow Edmond H N, Chen Zhuofan, Huang Baoxin
Department of Oral Implantology, Guanghua School of Stomatology, Hospital of Stomatology, Sun Yat-Sen University, No. 56, Lingyuan west road, Guangzhou, 510060, Guangdong, China.
Guangdong Provincial Key Laboratory of Stomatology, Guangzhou, Guangdong, China.
Surg Radiol Anat. 2019 Aug;41(8):935-942. doi: 10.1007/s00276-019-02257-0. Epub 2019 May 25.
To investigate the correlation of anterior overbite with the sagittal root position (SRP) and buccal bone thickness (BBT) of the maxillary anterior teeth.
Cone-beam computed tomography (CBCT) data of southern Chinese patients who underwent CBCT examinations between November 2016 and December 2016 were collected. The anterior overbite was the predictor variable while the SRP and the BBT at 4 mm apical to the cementoenamel junction (CEJ-4) and midpoint of the root of the maxillary anterior teeth were set as the primary and secondary outcome variables, respectively. All measurements were done by two calibrated examiners. Correlations between variables were analyzed by the Spearman's correlation coefficient. The significance level was set at P < 0.05.
CBCT data of 146 patients (65 men and 81 women) with a mean age of 44.2 ± 13.4 years were analyzed, and of the 876 maxillary anterior teeth evaluated, 9.8% were presented with deep overbites. Most of roots of the anterior teeth (94.9%) were positioned against the buccal cortical plate, of which, in 63.8% of them the apex was not covered by bone along the long axis of the tooth. The mean BBT at CEJ-4 was 0.89 mm at the central incisor, 0.85 mm at the lateral incisor and 0.84 mm at the canine. The overbite was positively correlated with SRP Class I subtypes and the BBT at CEJ-4 (P < 0.05).
Deep overbite was more frequently accompanied by bone fenestration in the anterior maxillary areas.
研究前牙覆合与上颌前牙矢状根位置（SRP）及颊侧骨厚度（BBT）之间的相关性。
收集2016年11月至2016年12月期间接受锥形束计算机断层扫描（CBCT）检查的中国南方患者的CBCT数据。以前牙覆合为预测变量，分别将上颌前牙牙骨质釉质界根尖4mm处（CEJ - 4）和牙根中点处的SRP及BBT设为主要和次要结局变量。所有测量均由两名经过校准的检查者进行。采用Spearman相关系数分析变量之间的相关性。显著性水平设定为P < 0.05。
分析了146例患者（65例男性和81例女性）的CBCT数据，平均年龄为44.2±13.4岁，在评估的876颗上颌前牙中，9.8%为深覆合。大多数前牙牙根（94.9%）位于颊侧皮质骨板，其中63.8%的牙根根尖沿牙长轴未被骨覆盖。中央尖牙处CEJ - 4的平均BBT为0.89mm，侧切牙处为0.85mm，尖牙处为0.84mm。覆合与SRP I类亚型及CEJ - 4处的BBT呈正相关（P < 0.05）。
深覆合更常伴有上颌前部区域的骨开窗。
