Imaging Science in Dentistry

Korean Academy of Oral and Maxillofacial Radiology (대한영상치의학회)
권호 표지

Quantitative analysis of periapical lesions on cone beam computed tomograph and periapical radiograph

Cone beam형 전산화단층영상과 치근단방사선영상의 치근단 병소에 대한 정량적인 분석

  • Kim, Jin-Hoa (Department of Oral & Maxillofacial Radiology, Wonkwang University) ;
  • Lee, Wan (Department of Oral & Maxillofacial Radiology, Wonkwang University) ;
  • Kim, Kyung-Soo (School of Dentistry, Wonkwang University) ;
  • Roh, Young-Chea (School of Dentistry, Wonkwang University) ;
  • Kim, De-Sok (Department of Electrical Engineering, Korea Advanced Institute of Science and Technology) ;
  • Lee, Byung-Do (Department of Oral & Maxillofacial Radiology, Wonkwang University)
  • 김진화 (원광대학교 치과대학 구강악안면방사선학교실) ;
  • 이완 (원광대학교 치과대학 구강악안면방사선학교실) ;
  • 김경수 (원광대학교 치과대학) ;
  • 노영채 (원광대학교 치과대학) ;
  • 김대석 (한국과학기술원) ;
  • 이병도 (원광대학교 치과대학 구강악안면방사선학교실)
  • Published : 2009.03.31
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Abstract

Purpose: To detect the progression of experimentally induced periapical lesions on periapical radiograph and cone beam computed tomograph (CBCT) by quantitative analysis. Materials and Methods: After the removal of coronal pulps from premolars of two Beagle dogs, the root canals of premolars were exposed to oral environment during one week and then sealed for 70 days. Digital periapical radiographs and CBCTs were taken at baseline and every 7 days for 77 days after pulp exposure. We examined occurrence and areas of periapical bone resorption. Three comparative groups of CBCT radiographs were prepared by average projection of thin slabs with different bucco-lingual thicknesses (0.1, 3.0, and 8.0 mm) using a 3D visualization software. Radiographic densities were compensated by image normalization. Digital images were processed with mathematical morphology operations. The radiographic density and morphological features of periapical lesions were compared among three groups of CBCT in different time points. Results: In the CBCT group with 0.1 mm thickness, radiographic density (p<0.05) and trabecular bone area (p<0.01) were significantly decreased at the fifth week. However, in the CBCT groups with 3 mm and 8 mm thickness and periapical radiographs, none of densitometric and morphological features showed any significant differences in different time points. Radiographic density of periapical lesion showed increasing tendency at the eleventh week after pulp exposure. Conclusion: Radiographic detection of periapical lesions was possible at the fifth week after pulp contamination by quantitative method and was affected by buccolingual bone thickness.

Keywords

References

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