Change in dentition over 20 years from third decade of life |
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| Authors: | Aiko Tanoi Etsuko Motegi Kenji Sueishi |
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| Institution: | 1. Centro Nacional de Investigación sobre la Evolución Humana (CENIEH), Paseo Sierra de Atapuerca 3, 09002 Burgos, Spain;2. Àrea de Prehistoria, Universitat Rovira i Virgili (URV), Avinguda de Catalunya 35, 43002 Tarragona, Spain;3. IPHES, Institut Català de Paleoecologia Humana i Evolució Social, C/ Marcel.lí Domingo s/n – Campus Sescelades URV (Edifici W3), 43007 Tarragona, Spain;4. Area of Neogene and Quaternary Faunas, Institut Català de Paleontologia, Campus de la UAB, Cerdanyola del Vallès, Barcelona, Spain;5. The Gibraltar Museum, 18-20 Bomb House Lane, P. O. Box 939, Gibraltar;6. Institute of Life and Earth Sciences, University of Gibraltar, Gibraltar;1. Department of Solid State Physics and Nanostructures, Voronezh State University, University sq. 1, Voronezh 394006, Russia;2. Instituto de Ciencias, Benemérita Universidad Autónoma de Puebla, Puebla, Mexico;3. Department of Pediatric Dentistry with Orthodontia, Voronezh State Medical University, Voronezh, Russia;1. Department of Oral Pathobiological Science and Surgery, Tokyo Dental College, 2-9-18, Kandamisaki-cho, Chiyoda-ku, Tokyo 101-0061, Japan;2. Department of Pathophysiology, Tokyo Dental College, 2-9-18 Kandamisaki-cho, Chiyoda-ku, Tokyo 101-0061, Japan;1. Faculty of Dentistry, Department of Orthodontics, Akdeniz University, Antalya, Turkey;2. Private Practice of Orthodontics, Akdeniz University, Antalya, Turkey |
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| Abstract: | PurposePrevious studies have documented long-term, age-related change in the teeth, dental arches and occlusion. However, very few studies have investigated longitudinal age-related change in the dentition using 3-dimensional (3-D) measurement. The purpose of this study was to clarify age-related change in the dentition using a laser scanner.Materials and methodsWe used dental casts obtained from the same subjects in their twenties and forties. Subjects were selected based on near-normal occlusion. We investigated age-related variation in the dentition using 3-D measurement.ResultsAge-related change in the dentition was characterized by a decrease in maxillary and mandibular width, an increase in maxillary length, and a decrease in mandibular length. Measurement of angulation revealed that the maxillary canines and molars were mesially inclined. We observed labial inclination of the maxillary incisors, and lingual inclination of the mandibular incisors, as well as the maxillary and mandibular canines and molars. Overjet, overbite, and the irregularity index all showed an increase, while occlusal vertical dimension showed a decrease. Multiple regression analysis indicated that lingual inclination of the lower central incisors was related to an increase in the irregularity index, and that lingual inclination of the upper canines and decrease in occlusal vertical dimension of the anterior teeth were related to increased overbite.ConclusionThe present findings showed that age-related changes in angulation and inclination of each tooth should be taken into account when providing occlusal rehabilitation or post-orthodontic retention. |
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