title: Assessing joint space and condylar position in the people with normal function of temporomandibular joint with cone-beam computed tomography.
abstract: BACKGROUND
  The optimal position of the condyle in glenoid fossa is a fundamental question in dentistry. There is no quantitative standard for the optimal position of mandibular condyle in the glenoid fossa in our population. The purpose of this study is to assess the position of the condyle by cone beam computed tomography (CBCT) images in patient with normal function of temporomandibular joint (TMJ).
  
  
  METHODS
  In this cross-sectional study, CBCT images of 40 class I skeletal patients (15 males and 25 females) without history of TMJ disorders were selected. Next, the anterior, superior and posterior joint spaces (Ajs, Sjs, Pjs) were measured on the two true central sagittal slices. Then medial (M) and lateral (L) joint spaces on true coronal view were measured in the right and left sides, separately. After that, P/A ratio, S/A ratio and M/L ratio were calculated. Finally, a paired t-test and independent samples t-test were employed for analysis.
  
  
  RESULTS
  The centric position of the condyle in glenoid fossa was more common (92.5%) than other positions. Significant differences in Ajs, Sjs, Pjs, Mjs and Ljs values between two sides were observed (P ≤ 0.05). Additionally, Sjs showed statistically significant differences between the sexes (P = 0.05). P/A ratio and S/A ratio had significant differences between two sides but not between those sexes.
  
  
  CONCLUSIONS
  The assessment of joint spaces in right and left sides should be done independently. Overall, the measured joint spaces except Sjs are not different in two sexes. The data from this study could be a useful and comparable reference for the clinical assessment of condylar position in patients with normal functional joints.
authors.affiliation: Department of Maxillofacial Radiology, Guilan University of Medical Sciences, Rasht, Guilan, Iran.
authors.forename: Zahra
authors.initials: Z
authors.lastname: Dalili
authors.forename: Nasim
authors.initials: N
authors.lastname: Khaki
authors.forename: Seyed Javad
authors.initials: SJ
authors.lastname: Kia
authors.forename: Fatemeh
authors.initials: F
authors.lastname: Salamat
keywords: Cone beam CT; mandibular condyle; temporomandibular joint
references.citation: Acta Odontol Scand. 1977 May;35(2):77-83
references.pmid: 266827
references.citation: J Oral Rehabil. 2004 May;31(5):438-44
references.pmid: 15140169
references.citation: J Oral Maxillofac Surg. 1987 Oct;45(10):852-4
references.pmid: 3477621
references.citation: Angle Orthod. 2000 Feb;70(1):70-80
references.pmid: 10730678
references.citation: Am J Orthod Dentofacial Orthop. 2002 Nov;122(5):486-90
references.pmid: 12439476
references.citation: Am J Orthod Dentofacial Orthop. 2005 Sep;128(3):337-46
references.pmid: 16168330
references.citation: Dentomaxillofac Radiol. 2004 Sep;33(5):291-4
references.pmid: 15585804
references.citation: Oral Surg Oral Med Oral Pathol Oral Radiol Endod. 1999 Jul;88(1):106-11
references.pmid: 10442954
references.citation: J Oral Rehabil. 2003 Nov;30(11):1070-5
references.pmid: 14641670
references.citation: Dent Today. 2006 Nov;25(11):130, 132-5
references.pmid: 17128717
references.citation: Dentomaxillofac Radiol. 2008 Jan;37(1):10-7
references.pmid: 18195249
references.citation: Dentomaxillofac Radiol. 2004 May;33(3):196-201
references.pmid: 15371321
references.citation: J Oral Maxillofac Surg. 2004 Jan;62(1):39-43
references.pmid: 14699547
references.citation: Acta Radiol Diagn (Stockh). 1966 May;4(3):273-88
references.pmid: 5941956
references.citation: Am J Orthod Dentofacial Orthop. 2004 Jul;126(1):48-52
references.pmid: 15224058
references.citation: J Orofac Pain. 1997 Winter;11(1):37-47
references.pmid: 10332309
references.citation: Int J Periodontics Restorative Dent. 1985;5(4):34-61
references.pmid: 3864761
references.citation: Eur J Radiol. 2004 Sep;51(3):269-73
references.pmid: 15294336
references.citation: Int J Oral Maxillofac Implants. 2004 Mar-Apr;19(2):228-31
references.pmid: 15101594
references.citation: Am J Orthod Dentofacial Orthop. 1993 Sep;104(3):230-9
references.pmid: 8362784
references.citation: Angle Orthod. 1996;66(1):27-35
references.pmid: 8678342
references.citation: Dentomaxillofac Radiol. 2004 Nov;33(6):391-5
references.pmid: 15665233
references.citation: Am J Orthod Dentofacial Orthop. 1994 May;105(5):483-8
references.pmid: 8166098
references.citation: Am J Orthod Dentofacial Orthop. 1998 Sep;114(3):328-36
references.pmid: 9743139
references.citation: Am J Orthod Dentofacial Orthop. 2009 Apr;135(4):495-501
references.pmid: 19361736
references.citation: Am J Orthod Dentofacial Orthop. 2006 May;129(5):619-30
references.pmid: 16679202
references.citation: J Prosthet Dent. 1983 Apr;49(4):532-45
references.pmid: 6573501
references.citation: J Dent Res. 2004 Jun;83(6):480-4
references.pmid: 15153456
references.citation: Oral Surg Oral Med Oral Pathol Oral Radiol Endod. 2008 Aug;106(2):e52-63
references.pmid: 18547834
references.citation: Am J Orthod Dentofacial Orthop. 1996 Mar;109(3):249-62
references.pmid: 8607470