title: Dental arch asymmetry.
abstract: OBJECTIVE
  This study was conducted to assess the dental arch asymmetry in a Yemeni sample aged (18-25) years.
  
  
  METHODS
  The investigation involved clinical examination of 1479 adults; only 253 (129 females, 124 males) out of the total sample were selected to fulfill the criteria for the study sample. Study models were constructed and evaluated to measure mandibular arch dimensions. Three linear distances were utilized on each side on the dental arch: Incisal-canine distance, canine-molar distance and incisal-molar distance, which represent the dental arch segmental measurements.
  
  
  RESULTS
  When applying "t-test" at P < 0.05, no significant differences were found between the right and left canine-molar, incisal-canine and incisal-molar distances in both dental arches for both sexes. The greater variation (0.30 mm) was observed between right and left canine-molar distance in the maxillary dental arch in male and the smaller (0.04 mm) in the mandibular dental arch between the right and left canine-molar distance in females.
  
  
  CONCLUSIONS
  The findings of the present study revealed a symmetrical pattern of dental arches, since the right and left sides showed no statistically significant difference. In general, it can be observed that the measurements related to the central incisors and canines have the widest range of reading and give the impression that the location of central incisor and canines to each other and to other teeth is the strongest factor in determining the dental arch asymmetry.
authors: Department of Orthodontics, Sana'a University, Sana'a, Yemen.
authors: Nabil Muhsen
authors: NM
authors: Al-Zubair
keywords: Dental arch asymmetry; Yemen; dental cast analysis