Document Detail

Reproducibility of three-dimensional coordinate systems based on craniofacial landmarks.
MedLine Citation:
PMID:  22348241     Owner:  NLM     Status:  Publisher    
Abstract Objectives: To propose a method for evaluating the reproducibility of anatomical coordinate systems based on craniofacial skeletal landmarks and to tentatively evaluate four systems created on preoperative cone-beam computed tomography (CBCT) data obtained from mandibular prognathism patients in order to confirm the utility for actual patients' data. Materials and Methods: In three-dimensional images of 10 patients obtained by a CBCT with a large field of view, six dentists set four coordinate systems that were created in different ways, twice by plotting some landmarks situated in the superior portion of the maxillofacial skeletons. The 95% confidence ellipse of six objective landmarks related to the jaw and teeth (upper incisor, left upper first molar, lower incisor, left lower first molar, menton, and left gonion) were three-dimensionally drawn for each coordinate system. The ellipsoid volume was calculated to evaluate the reproducibility of the coordinate systems. Results: The reproducibility could be evaluated for each coordinate system using the method proposed. The coordinate systems that were created by landmarks situated at greater distances from each other showed relatively small ellipsoid volume in comparison to those with shorter distances between landmarks. Conclusion: Anatomical coordinate systems with larger distances between the landmarks used were stable when landmarks related to the jaw and teeth were assigned as objective landmarks. The method proposed here was effective in terms of the reproducibility evaluation of a coordinate system.
Momoko Shibata; Hiroyuki Nawa; Yoshitaka Kise; Mariko Fuyamada; Kazuhito Yoshida; Akitoshi Katsumata; Eiichiro Ariji; Shigemi Goto
Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-2-20
Journal Detail:
Title:  The Angle orthodontist     Volume:  -     ISSN:  1945-7103     ISO Abbreviation:  -     Publication Date:  2012 Feb 
Date Detail:
Created Date:  2012-2-21     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0370550     Medline TA:  Angle Orthod     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
a Instructor, Department of Orthodontics, Aichi-Gakuin University School of Dentistry, Nagoya, Japan.
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