Influence of Cross-bite Arrangement of Complete Dentures on Pronunciation. Analysis by an Articulation Pronunciation Test.

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  • 総義歯の交叉こう合排列が発音に及ぼす影響　　語音明瞭度検査による分析
  • Analysis by an Articulation Pronunciation Test
  • 語音明瞭度検査による分析

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Abstract

Purpose: This study investigated pronunciation disorders regarded as a disadvantage in cross-bite arrangement of complete dentures.<BR>Methods: An articulation test of pronouncing 67 single sounds (62 consonants and 5 vowels) was applied to a dentulous subject group, and a complete denture-wearer group subdivided into a cross-bite group, and a normal-bite group. The rate of mishearing and the rate of mishearing each sound in each subject, and the average mishearing rate and the average mishearing rate of each sound in each group, were calculated. The test sounds that demonstrated a higher-than-average mishearing rate were sorted out and evaluated according to the place of articulation.<BR>Results: 1. Rate of mishearing. 1) In both the cross-bite group and the normal-bite group, there were significant differences among subjects. 2) In the complete denture-wearer group, there was a significant negative correlation between the rate of mishearing and the duration of having used the present complete denture. 3) There was no significant difference among groups. 2. Sorted misheard sounds according to the place of articulation. 1) The number of sorted misheard sounds involving alveolars and glottals in the cross-bite group was greater than in the normal-bite group. 2) In the cross-bite group, dentals, alveolars, and velars tended to be misheard as sounds with a different place of articulation, and glottals tended to lack the preceding consonant. However, there was no significant difference in comparison with the normal-bite group.<BR>Conclusions: Articulation testing in pronunciation indicated that there was no significant difference between the cross-bite group and the normal-bite group, but there was a significant negative correlation between the rate of mishearing and the duration of having used the present complete denture in the complete denture-wearer group. Therefore, it was suggested that pronunciation disorders can be recovered by experience with a denture.

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