How lip and tongue forces against incisors relate to craniofacial morphology in anterior open bite patients with a tongue thrust habit

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概要

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• Dental arch form and tooth position are influenced by perioral forces, especially those of the tongue and lip. We measured tongue and lip forces against the maxillary and mandibular left central incisors in open bite patients who had a tongue thrust habit. The open bite patients were then compared with normal subjects and the relationship between these forces and craniofacial morphology was examined. Lateral cephalograms of 10 open bite patients and 8 normal subjects were analyzed. Lip and tongue forces were measured at the center of the labial surface, the cervix of the lingual surface, and near the edge of the lingual surface on the maxillary and mandibular left central incisors. Lip and tongue forces at rest were recorded for all the measurement points. On swallowing, the maximum force, time quadrature of force, and averaged force were recorded for all measurement points. Also, on the lingual surface the ratio of forces near the edge to forces on the cervix was calculated for each measurement item. Forces at rest, the maximum force, time quadrature, averaged force, and each ratio were compared for the open bite patients and normal subjects using the Student's t-test. On swallowing, forces of all measurement items on the cervix of the maxillary central incisors were smaller than normal while those on the cervix of the mandibular were larger. Among open bite patients, craniofacial morphology and the tongue forces against the mandibular central incisors on swallowing were compared using correlation analysis. A high correlation was seen between tongue force and occlusal plane angle, interincisal angle, and L1 to mandibular plane angle. These results suggest that the tongue position lowers during swallowing, while the occlusal plane angle and L1 to mandibular plane angle increase. However, the interincisal angle becomes smaller. As the tongue position lowers on swallowing, there is a possibility of it causing changes in the alveolus, which determines the labial inclination of the mandibular central incisors.

• 大阪歯科学会の論文

著者

• Rensha Hiroki

  Department of Orthodontics, Osaka Dental University

• Rensha Hiroki

  Osaka Dental Univ. Osaka Jpn

• Rensha Hiroki

  Graduate School of Dentistry(Orthodontics), Osaka Dental University

関連論文

• Relationship between occlusal force, mandibular morphology and three-dimensional facial morphology in normal occlusion
• Relationship between three-dimensional facial morphology and craniofacial morphology in normal occlusion
• How lip and tongue forces against incisors relate to craniofacial morphology in anterior open bite patients with a tongue thrust habit
• Evaluation of three-dimensional facial morphology in maxillary protrusion using radius of curvature
• Morphological alveolar changes with pre-surgical orthopedic treatment of the unilateral cleft lip and palate
• Morphological alveolar changes with pre-surgical orthopedic treatment of the unilateral cleft lip and palate

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