Department of Orthodontics, Shanghai Ninth People's Hospital, College of Stomatology, 56694Shanghai Jiao Tong University School of Medicine, Huangpu District, Shanghai, China.
National Clinical Research Center for Oral Disease, Shanghai, China.
Cleft Palate Craniofac J. 2021 Feb;58(2):215-221. doi: 10.1177/1055665620950155. Epub 2020 Aug 18.
To evaluate the tooth lengths, crown to root ratios (CRRs), and alveolar bone support (ABS) around cleft-adjacent maxillary central incisors (U1s) in patients with unilateral cleft lip and alveolus (UCLA) and to investigate the relationships between CRR and ABS.
This is a retrospective study.
Cleft Lip and Palate Care Center of Shanghai Ninth People's Hospital, Shanghai, China.
Fifty-eight Chinese patients with UCLA.
Cone beam computed tomography data from 58 nonsyndromic patients with UCLA (36 males, 22 females; mean age = 12.65 ± 3.64 years) were evaluated. Crown length and root length, alveolar bone thickness (ABT), and the distances between the cementoenamel junction and alveolar bone crest on 4 surfaces of cleft-adjacent U1 were measured and compared with those of noncleft side in the same patients. Crown to root ratio and frequency of dehiscence were calculated and comparisons were also made between cleft and noncleft sides. Regression analysis was performed to explore the association between CRR and ABS.
The CRR of cleft-adjacent U1 and alveolar bone crest heights (ACHs) on the 4 surfaces were significantly greater than those of noncleft side ( < .01). A 3 mm labial, all lingual, and apico-distal ABTs decreased on the cleft side ( < .01). A positive correlation was found between lingual ACH and CRR ( = 0.316, < .05), between the 3 mm ( = 0.417, < .05) and 6 mm labial ( = 0.448, .05) ABT and CRR. A negative correlation was found between the 3 mm and 6 mm labial ABTs and the root length.
It can be suggested that the CRR is related to ACH and ABT. The lingual ACH, the 3 mm, and 6 mm labial ABTs tend to increase with the increasing CRR.
评估单侧唇腭裂（UCLA）患者裂隙侧上颌中切牙（U1）的牙长、冠根比（CRR）和牙槽骨支持（ABS），并探讨 CRR 与 ABS 的关系。
这是一项回顾性研究。
中国上海第九人民医院唇腭裂治疗中心。
58 例非综合征性 UCLP 患者。
对 58 例非综合征性 UCLP 患者（36 例男性，22 例女性；平均年龄=12.65±3.64 岁）的锥形束 CT 数据进行评估。测量并比较了患者裂隙侧和非裂隙侧同名牙的牙冠长度和根长、牙槽骨厚度（ABT）以及 4 个牙面的釉牙骨质界到牙槽嵴顶的距离。计算 CRR 和裂隙侧的牙骨质开裂率，并比较裂隙侧和非裂隙侧的 CRR。采用回归分析探讨 CRR 与 ABS 的关系。
裂隙侧 U1 的 CRR 和 4 个牙面的牙槽嵴顶高度（ACH）均显著大于非裂隙侧（ <.01）。裂隙侧的唇侧 3mm、全部舌侧和根尖-冠向 ABT 减小（ <.01）。舌侧 ACH 与 CRR 呈正相关（ = 0.316， <.05），3mm（ = 0.417， <.05）和 6mm 唇侧（ = 0.448， .05）ABT 与 CRR 呈正相关。3mm 和 6mm 唇侧 ABT 与根长呈负相关。
CRR 与 ACH 和 ABT 有关。舌侧 ACH、3mm 和 6mm 唇侧 ABT 随着 CRR 的增加而增加。
