Study on the Error of CBCT Images of Alveolar Crest of Proposed Implant Site in Posterior Dental Region

doi:10.13701/j.cnki.kqyxyj.2023.06.008

Abstract

Abstract: Objective: To explore the error of CBCT images of the alveolar crest with discontinuous and fuzzy boundary in the proposed implant site in posterior dental region three months after the extraction. Methods: The trial was conducted at Department of Implantology, affiliated Stomatological Hospital of Xuzhou Medical University, from April 2022 to September 2022. Forty patients with a single molar missing for 3 months and CBCT showing discontinuous and fuzzy alveolar crest boundary in the missing area were included in the trial. The experimental group used the automatic bone threshold segmentation function provided by the medical 3D reconstruction software to extract the 2D mask of the alveolar bone image at the proposed implant site, while the control group used the manual interpretation method to extract the 2D mask of the alveolar bone image at the proposed implant site. Finally, the 3D digital model of the alveolar bone was reconstructed based on 2D mask, and compared with the optical model of alveolar crest obtained during the operation. The mean deviation (AVG) and root mean square (RMS) values of the differences between two groups were calculated using the deviation analysis algorithm. Results: The AVG and RMS of the CBCT reconstruction model and the optical scanning model at the implant site in the experimental group were (2.26±0.36) mm and (2.35±0.26) mm, respectively, which were greater than those in the control group [AVG was (1.25±0.21) mm, RMS was (1.31±0.20) mm], and the differences were statistically significant (P<0.05).Conclusion: Three months after tooth extraction, when the CBCT image of the alveolar crest is discontinuous and fuzzy, the error of the position of the alveolar crest interpreted manually was smaller than that obtained automatically by the software, and both of them had a certain error with the actual boundary of the alveolar crest. Therefore, the possible impact should be fully considered when planning the implant treatment program.

Key words: cone beam computed tomography, preoperative planning, alveolar crest, deviation analysis, posterior dental area

LIU Ya, WEI Luming, LI Xiaofei, LI Xiaoming, YUAN Changyong, WANG Penglai. Study on the Error of CBCT Images of Alveolar Crest of Proposed Implant Site in Posterior Dental Region[J]. Journal of Oral Science Research, 2023, 39(6): 505-509.

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