Craniofacial morphology in mouth breathing patients : Analysis of hereditary and environmental factors

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  • MIYAZONO,Hisanobu
    Department of orthodntics, Faculty of dentistry, Kyushu university
  • HASHIMOTO,Keiji
    Department of orthodntics, Faculty of dentistry, Kyushu university
  • IINO,Yasuko
    Department of orthodntics, Faculty of dentistry, Kyushu university
  • ITOU,Keisuke
    Department of orthodntics, Faculty of dentistry, Kyushu university
  • NAKASIMA,Akihiko
    Department of orthodntics, Faculty of dentistry, Kyushu university

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  • 口呼吸患者における顎顔面形態 : 遺伝および環境要因の分析

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Abstract

The purpose of this article is to evaluate the craniofacial morphology in patients with mouth breathing, and to evaluate the effect of hereditary and environmental factors. Fifty eight children, 23 boys and 35 girls, 6 to 12 years in age, were divided into mouth breathing group (group M) and nasal breathing group (group N) according to the objective symptoms and anamnesis. To eliminate individual differences, standard deviation unit (SDU) values were calculated and compared between the two groups. SDU values were calculated by dividing the difference between the measurements and mean values of the normal occlusion group by their respective standard deviations. As a result, mandibule in group M was significantly rotated more posteriorly than in group N and maxillary incisor was more retroclined. However, there were no significant differences between the two groups on the PA cephalometric measurements. On lateral cephalograms correlation between mid-parents and offspring in group M was lower than in group N. However, no difference was found on PA cephalograms. It was considered that craniofacial morphology in group M was affected functionally by mouth breathing in addition to hereditary factors.

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