ア行音発音時における口唇と上下顎前歯との関係

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In prosthesis for the anterior teeth, care must be given to forming the maxillary lingual surface and positions of the mandibular incisal edges in harmony with jaw movement and to forming lengths of the maxillary anterior teeth and degree of overlap of the upper and lower anterior teeth not in interference with pronounciation. It is also necessary to consider esthetics for the anterior teeth. Therefore, with a view to clarifying characteristics of the face at rest and at function, positional relations at rest between incisal edges of the maxillary anterior teeth and the conjugate of the lips were measured with 50 males in their twenties as subjects. Visibility of the upper and lower anterior teeth during pronounciation of five vowels was also examined. The results were as follows : 1. When the lips were not tense at intercuspal position, the incisal edges of the upper central incisors were 2.0±1.6mm below the conjugate of the lips. The incisal edge positions ranged from 5.8mm below the conjugate of the lips to 2.2mm above. 2. Clinical coronal lengths of the upper anterior teeth were 10.8±1.0mm for the central incisors, 9.2±0.9mm for the lateral incisors, and 10.2±1.1mm for the canines. For the lower teeth, the lengths were 8.6±1.0mm for the central incisors, 9.0±1.0mm for the lateral incisors, and 10.5±1.2mm for the canines. 3. The lengths of the upper anterior teeth exposed at pronounciation of five vowels were i>e≒a>u>o for the central and lateral incisors, and i>e≒a>u=o for the canines. For the lower jaw, the lengths were i>e>a>u>o for all the teeth. 4. The ratios of vertical lengths of the upper anterior teeth exposed at pronounciation of five vowels were 1__- : 2__- : 3__-=1 : 0.4 : 0.2 for 'a', 1 : 0.7 : 0.3 for 'i', 1 : 0.1 : 0.0 for 'u', 1 : 0.5 : 0.2 for 'e', and 1 : 0.0 : 0.0 for 'o'. 5. The ratios of vertical lengths of the lower anterior teeth exposed at pronounciation of five vowels were 1^^- : 2^^- : 3^^-=1 : 1.0 : 0.9 for 'a', 'i', 'e', 1 : 0.5 : 0.1 for 'u', and 1 : 0.6 : 0.0 for 'o'. 6. The clinical surface areas of the upper jaws projected on the coronal plane were 79.4±9.8mm^2 for the central incisors, 47.6±6.4mm^2 for the lateral incisors, and 43.4±6.9mm^2 for the canines. For the lower jaws, they were 38.2±5.7mm^2 for the central incisors, 40.0±5.7mm^2 for the lateral incisors, and 42.6±6.9mm^2 for the canines. 7. The ratios of surface areas of the upper anterior teeth exposed at pronounciation of five vowels were 1__- : 2__- : 3__-=1 : 0.2 : 0.1 for 'a', 1 : 0.4 : 0.1 for 'i', 1 : 0.0 : 0.0 for 'u', 1 : 0.3 : 0.1 for 'e', and 1 : 0.0 : 0.0 for 'o'. 8. The ratios of surface areas of the lower anterior teeth exposed at pronounciation of five vowels were 1^^- : 2^^- : 3^^-=1 : 0.9 : 0.6 for 'a', 1 : 1.0 : 0.8 for 'i', 1 : 0.4 : 0.0 for 'u', 1 : 0.9 : 0.6 for 'e', and 1 : 0.5 : 0.0 for 'o'.
九州歯科学会の論文
1988-04-25

ア行音発音時における口唇と上下顎前歯との関係

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