TAILIEUCHUNG - Age-related changes of the dental aesthetic zone at rest and during spontaneous smiling and speech

Even though most psychological studies of motivated behavior have not paid much attention to the realm beyond control and rationality, our everyday lived experience reminds us of its importance. Consider how we describe, in both everyday and poetic language, our most deeply engag- ing experiences. We are “swept away” in a passionate relationship. We “fall” in love as if pulled by an inexorable force. Intense films or books grip us; great ideas seize us; laughter infects us. As new. | European Journal of Orthodontics 30 2008 366-373 doi ejo cjn009 Advance Access publication 16 July 2008 The Author 2008. Published by Oxford University Press on behalf of the European Orthodontic Society. All rights reserved. For permissions please email . Age-related changes of the dental aesthetic zone at rest and during spontaneous smiling and speech Pieter Van der Geld Paul Oosterveld and Anne Marie Kuijpers-Jagtman Department of Orthodontics and Oral Biology Radboud University Nijmegen Medical Centre The Netherlands 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 first molar. Coherence in lip line heights during spontaneous smiling speech and tooth display in the natural rest position was confirmed by significant correlations. In older subjects maxillary lip line heights decreased significantly 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 significantly and teeth were displayed less during spontaneous smiling. Mandibular tooth display in the rest position .

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