Journal of Shandong University (Health Sciences) ›› 2019, Vol. 57 ›› Issue (12): 52-56.doi: 10.6040/j.issn.1671-7554.0.2019.346

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Evaluation of artifact of CBCT image of oral full crown prosthesis based on pixel gray value difference

SHEN Beiyong, WANG Xiaofei, LI Junxin, ZHOU Qi   

  1. Department of Stomatology, Shenzhen Second Peoples Hospital, The First Affiliated Hospital of Shenzhen University, Shenzhen 518035, Guangdong, China
  • Published:2022-09-27

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Abstract: Objective To establish a method for the two-dimensional tomographic image’s artifact of oral full crown prosthesis in cone beam computed tomography(CBCT)based on pixel gray difference. Methods A cobalt-chromium porcelain crown was prepared for the full crown preparation of the mandibular first molar, and then was fixed on a photocurable resin fixing plate. The full crown was scanned with CBCT, and then the DICOM data were input into MIMICS10.0 software. The obvious layer of artifacts was selected in the two-dimensional tomogram, and the normal gray value of the crown(G0), correct crown edge gray value(GB)and visible crown edge gray value(GP)were measured with Photoshop CS6 software, thereby quantitatively determining the artifact value V and the crown edge sharpness index C according to the gray value difference of each pixel point of the image. Results By simulating the intraoral scanning environment, the CBCT scan data of the full crown restoration was successfully obtained. According to the analysis results, the normal full crown gray value G0 of cobalt chromium full crown restoration was obtained. According to the GB and GP values, the value of cobalt-chromium-ceramic crown CBCT two-dimensional tomographic image artifact evaluation index V was ［21, 43］, and the cobalt-chromium full-crown CBCT two-dimensional tomographic image 山 东 大 学 学 报 (医 学 版)57卷12期 -沈倍勇,等.基于灰度值差的全冠修复体CBCT图像伪影评价方法 \=-edge definition index C was 51.67%. Conclusion Using the difference of gray value of image pixels, the crown edge of oral prosthesis can be clearly determined, and a method for quantitative evaluation of crown artifacts in oral prosthesis is established. Clinically, physicians can use the evaluation method for two-dimensional tomographic image artifact in CBCT based on image pixel gray value difference to quantitatively evaluate the artifacts of various restorations, and select appropriate restorations for patients.

Key words: Cone beam CT, Full crown, Gray value, Artifact, Tomographic image

CLC Number: 

  • R783
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