title: Quantitative analysis of errors in alveolar crest level caused by discrepant projection geometry in digital subtraction radiography: an in vivo study.
abstract: OBJECTIVE
  This study compared the difference between 3 intraoral radiographic techniques on digital subtraction radiography (DSR) in vivo that are commonly used in a clinical setting.
  
  
  METHODS
  We evaluated and statistically analyzed the errors in the DSR image in 6 regions with 3 radiographic techniques: paralleling technique with a bite block attached to XCP, paralleling technique using XCP, and bisecting-angle technique.
  
  
  RESULTS
  The amount of error using the bisecting-angle technique was too large for DSR, compared to that of the paralleling technique with a bite block attached to XCP. In the mandibular anterior region, the paralleling technique using XCP was not different from paralleling technique with a bite block attached to XCP. The lowest degree of error was present in the anterior region whereas the highest was present in the molar region.
  
  
  CONCLUSIONS
  Bisecting-angle technique should be avoided, and paralleling technique using XCP can be used in the mandibular anterior region for DSR.
authors.affiliation: Department of Oral and Maxillofacial Radiology, BK21, and Dental Research Institute, College of Dentistry, Seoul National University, Seoul, Korea.
authors.forename: Kyung-Hoe
authors.initials: KH
authors.lastname: Huh
authors.forename: Sam-Sun
authors.initials: SS
authors.lastname: Lee
authors.forename: In-Seong
authors.initials: IS
authors.lastname: Jeon
authors.forename: Won-Jin
authors.initials: WJ
authors.lastname: Yi
authors.forename: Min-Suk
authors.initials: MS
authors.lastname: Heo
authors.forename: Soon-Chul
authors.initials: SC
authors.lastname: Choi
mesh_terms: D000328:Adult; D000465:Algorithms; D000539:Alveolar Process / Q000000981:diagnostic imaging*; D003951:Diagnostic Errors; D006801:Humans; D007091:Image Processing, Computer-Assisted; D019252:Radiography, Dental, Digital / Q000295:instrumentation / Q000379:methods*; D015203:Reproducibility of Results; D013382:Subtraction Technique