Correlation of anterior overbite with root position and buccal bone thickness of maxillary anterior teeth: a CBCT study
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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.
KeywordsOcclusion Overbite Buccal bone thickness Sagittal root position CBCT Maxillary anterior teeth
This work was supported by the National Natural Science Foundation of China (Nos. 81400550, 81600914, and 81470783).
RS: data collection and data analysis, and manuscript writing; XL: data collection and data analysis and literature research; SC: data collection and data analysis; ZL: literature research and manuscript editing; ZTC: literature research and manuscript editing; EHNP: manuscript editing; ZFC: project development, data collection and data analysis, manuscript writing, and editing; BH: project development, data collection and data analysis, manuscript writing, and editing.
Compliance with ethical standards
Conflict of interest
The authors declare that they have no conflict of interest.
All procedures performed in studies involving human participants were in accordance with the ethical standards of the Ethical Committee of Guanghua School of Stomatology, Hospital of Stomatology, Sun Yat-sen University (ERC--32) and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.
This study was retrospective, and it did not alter the management of the patients; thus, no specific consent was required.
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