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- W2185492782 abstract "SUMMARY The aims of this study were to analyse lip line heights and age effects in an adult male population during spontaneous smiling, speech, and tooth display in the natural rest position and to determine whether lip line height follows a consistent pattern during these different functions. The sample consisted of 122 randomly selected male participants from three age cohorts (20 – 25 years, 35 – 40 years, and 50 – 55 years). Lip line heights were measured with a digital videographic method for smile analysis, which had previously been tested and found reliable. Statistical analysis of the data was carried out using correlation analysis, analysis of variance, and Tukey’s post hoc tests. Maxillary lip line heights during spontaneous smiling were generally higher in the premolar area than at the anterior teeth. The aesthetic zone in 75 per cent of the participants included all maxillary teeth up to the fi rst molar. Coherence in lip line heights during spontaneous smiling, speech, and tooth display in the natural rest position was confi rmed by signifi cant correlations. In older subjects, maxillary lip line heights decreased signifi cantly in all situations. Lip line heights during spontaneous smiling were reduced by approximately 2 mm. In older participants, the mandibular lip line heights also changed signifi cantly and teeth were displayed less during spontaneous smiling. Mandibular tooth display in the rest position increased signifi cantly. Upper lip length increased signifi cantly by almost 4 mm in older subjects, whereas upper lip elevation did not change signifi cantly. The signifi cant increasing lip coverage of the maxillary teeth indicates that the effects of age should be included in orthodontic treatment planning." @default.
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- W2185492782 date "2008-01-01" @default.
- W2185492782 modified "2023-09-27" @default.
- W2185492782 title "during spontaneous smiling and speech" @default.
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