ORIGINAL ARTICLE Clinical assessment of the palatal alveolar bone thickness and its correlation with the buccolingual angulation of maxillary incisors for immediate implant placement Thanh A. Do DDS 1 | Yen-Wen Shen DDS, MS 1 | Lih-Jyh Fuh DDS, PhD 1 | Heng-Li Huang PhD 1,2 1 School of Dentistry, China Medical University, Taichung, Taiwan 2 Department of Bioinformatics and Medical Engineering, Asia University, Taichung, Taiwan Correspondence Lih-Jyn Fuh and Heng-Li Huang, School of Dentistry, College of Dentistry, China Medical University, 91 Hsueh-Shih Road, Taichung City 40402, Taiwan, Republic of China. Email: ljfuh@mail.cmu.edu.tw, henleyh@gmail.com Funding information China Medical University, Grant/Award Number: CMU107-S-16; Ministry of Science and Technology, Taiwan, Grant/Award Number: NSC 102-2314-B-039 -027-MY3 Abstract Background: Clinicians needed to be aware of the thinness of the palatal bone plate when identifying severe protrusion of maxillary incisors, as this could result in perfo- ration of the palatal bone plate during surgical procedures associated with immediate maxillary implant placement. Purpose: This study evaluated the thickness of the palatal bone plate, the buccolingual angulation of maxillary incisors, and the correlation between these two parameters in relation to immediate implant placement. Materials and Methods: Cone-beam computed tomography images of 37 Asian patients (20-60 years old) with no evidence of dental treatment in the maxillary incisor area were collected and classified into groups based on sex and incisor locations. Sagittal slices were used to measure the palatal bone plate thickness at the cervical, middle, and apical levels, and the buccolingual angulation of each tooth was also measured. The intraclass correlation, Shapiro-Wilk test, descrip- tive analysis, Student's t-test, and Pearson correlation were used for statistical and correlation analyses, with P < .05 applied as the criterion for statistical significance. Results: At the apical level of all inspected teeth and the middle level of lateral inci- sors, the palatal bone was significantly thicker in males than in females. The inclina- tion of the maxillary lateral incisor showed a moderate negative linear correlation with the palatal bone thickness at the apical level (R = -0.517 and R = -0.579 for males and females, respectively). Conclusions: In an Asian population, an increased buccolingual angulation of the maxillary lateral incisors was correlated with a thinner palatal bone plate at the apical level. KEYWORDS buccolingual angulation, cone-beam computed tomography, immediate implant placement, palatal bone thickness, Pearson correlation Received: 9 April 2019 Revised: 14 June 2019 Accepted: 28 July 2019 DOI: 10.1111/cid.12835 Clin Implant Dent Relat Res. 2019;1–7. wileyonlinelibrary.com/journal/cid © 2019 Wiley Periodicals, Inc. 1