上顎前歯が下顎前歯部筋圧中立帯におよぼす影響
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概要
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In use of complete dentures for the upper and lower jaws, it is quite important for the dentures to be stable at rest and during speaking as well as during mastication. Factors considered to be closely related to this stability are forms of the flange of the mandibular anterior teeth region, and positioning and direction of the artificial teeth. Therefore, a comparative study was made of morphology of the labial surface of the neutral zone, at the mandibular anterior teeth region, formed by upper anterior teeth with and without lip support, which were satisfactory esthetically and functionary. The alveolar crest was designated as the base. The results were as follows : 1. The position of modiolus which affects the labial surface of the neutral zone during functioning was 20.0±3.2mm for the left side and 19.2±1.9mm for the right side on the frontal view with the median point of the mandibular alveolar crest as the base. Antero-posteriorly, the distance from the median point of the mandibular alveolar crest to the anterior border of retromolar pad was designated as 100 to obviate the effect of the alveolar ridge form, and the distance from the anteriority was expressed in percentage : left side 38.8±6.4% and right side 34.8±7.5%. 2. Effect of the presence or absence of lip support (for upper anterior teeth) on the labial surface of the mandibular neutral zone was the greatest at the median point and farther to the distal side, the less. 3. Changes, caused by providing lip support, in the labial surface of the neutral zone of the mandibular anterior teeth region were : anterior displacement of the whole labial surface in 60.6% ; anterior displacement of the portion above the mid-point of the labial denture border of denture plate and of the occlusal plane in 24.2% ; anterior inclination after lingual concaving in 9.1% ; and no anterior displacement in 6.1%. 4. Lingual displacement of the labial edge of the mandibular neutral zone was recognized at the median point with an increase in the vertical distance between the upper and lower jaws. 5. The labial edge of the neutral zone was more anteriorly positioned at the median point in the cases of a high mandibular alveolar ridge than in those of a low mandibular alveolar ridge. 6. The more anteriorly positioned the maxillary alveolar crest was than the mandibular alveolar crest, the more decresed the anteroposterior distance was between the incisal edge of the maxillary center incisor, which was esthetically satisfactory, and the maxillary alveolar crest. 7. In the cases in which the labial edge of the neutral zone of the mandibular anterior teeth region was on the labial side with the absence of lip support, swallowing and enunciation after providing lip support caused the edge to displace farther to the labial side.
- 九州歯科学会の論文
- 1983-12-25
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