title: Crown-root ratio of permanent teeth in cleft lip and palate patients.
abstract: OBJECTIVE
  To determine root lengths of fully developed permanent teeth of cleft lip and palate (CLP) patients and to define their crown-root (C/R) ratios.
  
  
  METHODS
  Crown height and root length of permanent teeth were measured from panoramic radiographs of 44 CLP patients and 37 controls. A total of 1397 teeth were measured, and C/R ratios were calculated.
  
  
  RESULTS
  Higher C/R ratios were found in CLP patients; this was statistically significant for both maxillary and mandibular incisors and canines. Bilateral CLP subjects showed higher C/R ratios in general than unilateral CLP subjects. Roots of maxillary incisors, canines, and some other teeth were significantly shorter in CLP patients than in controls.
  
  
  CONCLUSIONS
  CLP patients should be considered to have unfavorable C/R ratios, which could be the result of short root lengths for some teeth.
authors.affiliation: Department of Oral Medicine & Oral Surgery, Jordan University of Science & Technology, Irbid, Jordan. ghaidaa@just.edu.jo
authors.forename: Ghaida A
authors.initials: GA
authors.lastname: Al-Jamal
authors.forename: Abdalla M
authors.initials: AM
authors.lastname: Hazza'a
authors.forename: Ma'amon A
authors.initials: MA
authors.lastname: Rawashdeh
mesh_terms: D000293:Adolescent; D000328:Adult; D016022:Case-Control Studies; D002648:Child; D002971:Cleft Lip / Q000473:pathology*; D002972:Cleft Palate / Q000473:pathology*; D019229:Dentition, Permanent; D005260:Female; D006801:Humans; D008297:Male; D015588:Observer Variation; D009811:Odontometry; D011862:Radiography, Panoramic; D015203:Reproducibility of Results; D019228:Tooth Crown / Q000000981:diagnostic imaging / Q000473:pathology*; D014092:Tooth Root / Q000000981:diagnostic imaging / Q000473:pathology*; D055815:Young Adult