The Evaluation of Human Dry Mandible Motion on Linear Measurements and Quality Assessment Via Cone Beam Computed Tomography – in vitro Study

Document Type : Original Article


1 Assistant Professor of Oral and Maxillofacial Radiology. Department of Oral and Maxillofacial Radiology, Faculty of Dentistry, Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran.

2 Assistant Professor Food Hygiene.Department of Food Hygiene, Faculty of Veterinary Medicine Shahid Chamran University, Ahvaz, Iran.

3 Postgraduate Student,Oral and Maxillofacial Radiology. Department of Oral and Maxillofacial Radiology, Faculty of Dentistry, Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran.


Background  and  Objective:  the  role  of  cone  beam  CT  in  imaging  of  the  oral  and  maxillofacial  region  is  well  known  and  its  indications  and  possibilities  are still  increasing.  one  of  the  major  problems  remaining  to  be solved  is  the  unwanted  movements  of  the  patient  during  the  scanning  procedure. The purpose of this study is to evaluate effects of   human dry mandible motion on linear measurements and quality assessment via Cone Beam Computed Tomography. Although motion artifact is a common problem in daily pediatric diagnostic procedures, there are only few studies in the literatures on this topic.
Subjects and Methods: l0 dry adult human edentulous mandibles were used in this invitro analytical study.  Height,  width  and  quality  measured  for  three  areas  (midline,  right  posterior  and  left  posterior)  on  each  mandible. Three oral radiologists independently used a subjective rating score to evaluate the CBCT images. Obtained data analyzed via repeated measurements of variance LSD test and paired samples t test.
Results: No significant  statistical difference was observed in the assessment  of  jaw  dimensions (height  and width) with  and  without  motion  for  three  observers. But values  were  significant  in the assessment  of  parameters  due  to  quality  between  them.
Conclusion: According  to the  data obtained  from  this  study, we  conclude  that there is  no  significant  statistical difference  in assessment of  jaw  dimensions  (height  and  width ) between  three observers. Also, there is no significant statistical difference in the assessment of jaw dimension with and without motion, but observer's idea affects the quality of assessment.


1-White Sc, Allan G.  Farman.  Cone – Beam Computed Tomography.  In: White Sc, Pharaoh MJ. Oral radiology principles and interpretation. 6th ed.  St. Louis: Mosby Elsevier; 2009. p. 225-33.
2-Hanzelka T, Foltan R, Horka E, Sedý J. Reduction of the negative  influence of patient motion on quality of CBCT Scan. Medic Hypotheses  2010; 75: 610-2. Available  from: URL: http:// www. science direct. com
3-Yazdi M, Beaulieu L. Artifacts in Spiral x-ray CT Scanners: problems  and  solutions. In J Biolog life sci 2008;4(3):135-8.
4-Grimard BA, Hoidal MJ, Mills MP, Mellonig JT, Nummikoski PV,  Mealey BL. Comparison of clinical, periapical radiograph and cone-beam  Volume tomography measurement techniques for assessing bone level  changes  following  regenerative  perio  dontal  therapy.  J  Periodontol 2009;80(1):48-55 .
5-Bender SA, Rogalski JB, Mills MP, Arnold RM, Cochran DL, Mellonig J. Evaluation of demineralized bone matrix Paste and  putty  in  periodontal  intra osseous  defects.  J Periodontol 2005;76(5):768-77.
6-Brooks RA, Di chiro G. Beam hardening in X-ray reconstructive  tomography. Phys Med Boil 1976;21(3):390-8 .
7-Cotti E, Vargiu P, Dettori C, Mallarini G. Computerized tomography in the management and  follow-up of extensive periapical lesion. Endod Dent traumatol 1999;15(4):186-9 .
8-Jacobson A, Jacobson  RL, eds. Radiographic cephalometry: from  basics  to  3-d imaging. 2nd  ed.  Chicago: Quintessence; 2006 .
9- Peltola J. Cone Bean Computed tomography in oral radiology.Depart of Oral Radiology. 2010 Mar;26:1 - 80.
10-Bushong SC, Swisher R. Image Quality. In: Bushong  SC. Radiologic  Science for technologists: physics, biology, and protection. 9th ed.  St. Louis: Mosby Elsevier; 2008.P. 273-93.
11- Blattner TC, George N, Lee CC, Kumar V, Yelton CD. Efficacy of cone-beam computed tomography as a modality to accurately identify the presence of second mesiobuccal canals in maxillary first and second molars: a pilot study. J Endod. 2010 May ;36(5):867- 70.
12-Naitoh M, Katsumata A, Kubota Y, Okumura S, Hayashi H, Ariji E.  The role  of  objective  plane  angulation on the mandibular image  using cross-sectional tomography. J Oral Implantol 2006;32(3):117-21.