These tools will no longer be maintained as of December 31, 2024. Archived website can be found here. PubMed4Hh GitHub repository can be found here. Contact NLM Customer Service if you have questions.


Pubmed for Handhelds

PUBMED FOR HANDHELDS

Search MEDLINE/PubMed

  • Title: Genetics or environment? A twin-method study of malocclusions.
    Author: Kawala B, Antoszewska J, Necka A.
    Journal: World J Orthod; 2007; 8(4):405-10. PubMed ID: 18092526.
    Abstract:
    AIM: To assess malocclusions susceptible to orthodontic prophylaxis by using the twin-method of analysis. MATERIAL AND METHODS: A comparative analysis of malocclusion was performed in monozygotic and dizygotic twins (164 twin-pairs: 90 monozygotic pairs composed of 50 male and 40 female twin-pairs, and 74 dizygotic twin-pairs, with 46 male twin-pairs and 28 female twin-pairs). The zygotic twin-status certainty was 98%, assigned using serologic and morphologic criteria together with dermatoglyphs. The Allen equation was applied for calculation of the hereditary coefficient for a given malocclusion. Significance established at P < .05 was used to analyze the data. RESULTS: Different distribution of within-pair malocclusions depended upon the gender of the individuals; nevertheless, the differences with statistical significance occurred only in Class II males and females and males with crossbites. High frequency of within-pair malocclusion similarity (80% to 94%) characterized all groups except the dizygotic males, where the magnitude was 2 times less. The differing distribution of the dentoalveolar discrepancies was not statistically significant (P > .05). The frequency of within-pair similarity equaled 100% in monozygotic patients, while only 57% was found in dizygotic females. The hereditary coefficient had low or negative values-only in males did the examined values exceed 10%. CONCLUSION: This investigation showed that environmental factors account for more malocclusions than previously believed. This result encourages early intervention to intercept, disrupt, and diminish the effects of malocclusions.
    [Abstract] [Full Text] [Related] [New Search]