title: Eye-rima oris distance and its relation to the vertical dimension of occlusion measured by two methods: Anthropometric study in a sample of Yemeni dental students.
abstract: OBJECTIVE
  This study was conducted to evaluate the relationship between the distance measured from the distal outer of the eye to the parting line of the lips and the occlusal vertical dimension (OVD) measured by two methods.
  
  
  METHODS
  One hundred and fourteen dental students (76 males and 38 females) were recruited for this study with mean age (22.34 ± 1.83) years. The distance from distal canthus of the eye to rima oris (eye-RO) was compared with two different measurements of the OVD (nasal [N] to gnathion [Gn], and subnasal [Sn] to menton [Me]). All distances were measured using modified digital caliper.
  
  
  RESULTS
  Pearson correlation coefficient test for correlations and paired samples t-test for differences were used with a significant level of (P < 0.05). There was a positive significant correlation between the eye-RO distance and the two measurements of the OVD. However, this correlation was stronger between eye-RO and the distance from the tip of the nose to the tip of the chin than that between eye-RO and the distance from the septum of the nose to the under of the chin (r = 0.313 with P = 0.0007, r = 0.296 with P = 0.0014), respectively.
  
  
  CONCLUSIONS
  The distance from the outer canthus of the eye to the parting of the lips seems to be a reliable method in predicting the OVD and should relate to the distance from the tip of the nose to the tip of the chin.
authors.affiliation: Department of Oral Rehabilitation, Faculty of Dentistry, Khartoum University, Khartoum, Sudan.|Department of Prosthodontics, Faculty of Dentistry, Thamar University, Dhamar, Yemen.
authors.forename: Mohammed Nasser
authors.initials: MN
authors.lastname: Alhajj
authors.affiliation: Department of General and Specialist Dental Practice, College of Dental Medicine, University of Sharjah, Sharjah, UAE.
authors.forename: Nadia
authors.initials: N
authors.lastname: Khalifa
authors.affiliation: Department of Periodontics, Faculty of Dentistry, Thamar University, Dhamar, Yemen.
authors.forename: Abdullah
authors.initials: A
authors.lastname: Amran
keywords: Corner of the mouth; occlusal vertical dimension; outer canthus of the eye; rima oris