Incidence and effects of genetic factors on canine impaction in an isolated Jewish population

Am J Orthod Dentofacial Orthop. 2011 Apr;139(4):e331-5. doi: 10.1016/j.ajodo.2010.06.023.


Introduction: The etiology of palatal canine impaction is multifactorial and includes a genetic contribution. The aim of this study was to find the incidence and effects of genetic factors on palatally impacted canines in a genetically isolated community of ultraorthodox Hassidic Jews of Ashkenazi decent.

Methods: For this study, we retrospectively evaluated 1000 charts of Hassidic Jewish patients. Their distribution was 58% female and 42% male, with a mean age of 14 years.

Results: From those patients, 49 (4.9%) were determined to have canine impaction. Of these 49, 69.4% had unilateral palatal impaction, 26.5% had bilateral palatal impaction, and 4.1% had unilateral labial impaction. The z-test of proportion showed that female patients have a greater percentage than males for unilateral palatal impaction (P <0.01) with left-side dominance (P <0.01).

Conclusions: Our results imply that genetics plays a significant role in maxillary canine palatal impaction. A genetically isolated Hassidic Jewish community can be a useful group to study the effects of genetic factors on various dental anomalies, including palatally displaced canines.

MeSH terms

  • Adolescent
  • Age Factors
  • Bicuspid / pathology
  • Cephalometry / methods
  • Cuspid / pathology*
  • Dental Arch / pathology
  • Female
  • Humans
  • Incidence
  • Jews / ethnology
  • Jews / genetics*
  • Jews / statistics & numerical data
  • Lip / pathology
  • Male
  • Maxilla / pathology
  • Molar / pathology
  • New York City / epidemiology
  • Odontometry / methods
  • Palate / pathology
  • Retrospective Studies
  • Sex Factors
  • Tooth, Impacted / classification
  • Tooth, Impacted / epidemiology*
  • Tooth, Impacted / ethnology
  • Tooth, Impacted / genetics