Dentoskeletal and tegumental changes in individuals with normal occlusion after a 40-year follow-up

• Ano de defesa: 2019
• Autor(a) principal: Natsumeda, Gabriela Manami
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: eng
• Instituição de defesa: Biblioteca Digitais de Teses e Dissertações da USP
• Palavras-chave em Português: Adultos; Adults; Aging; Cephalograms; Envelhecimento; Maturação; Maturation; Normal occlusion; Oclusão normal; Telerradiografias
• Link de acesso: http://www.teses.usp.br/teses/disponiveis/25/25144/tde-05092019-200234/

Introduction: Craniofacial growth and development is a continuous process that determines maturational changes throughout life. Objectives: The aim of this study was to evaluate cephalometric changes in individuals with normal occlusion from 17 years of age to the seventh decade of life. Methods: The sample comprised lateral cephalograms of 21 subjects with normal occlusion (11 males, 10 females), taken at 17 (T1) and 61 years of age (T2), which were digitized and measured using Dolphin Imaging 11.0 software. Anteroposterior and vertical maxillomandibular relationship, dentoalveolar and tegumental changes were analyzed. The interphase comparison was performed using paired t tests. Sexual dimorphism was evaluated using t tests. Results: A significant anterior displacement of the maxilla and mandible was observed between T1 and T2 time points. An increase of the ramus height, a counterclockwise rotation of the occlusal, palatal and mandibular planes, and a decrease of the upper facial height were observed during maturational process. Maxillary first molars tipped mesially and extruded. Soft tissue changes with aging were a decrease of the nasolabial angle, upper and lower lip retrusion and an increase of the soft-tissue chin thickness. A decrease of the maxillary incisor exposure and upper lip thickness was also observed. Sexual dimorphisms in the mandibular anteroposterior displacement and rotation were found. In males, a protrusion and a counterclockwise rotation of the mandible was found with a decrease in the overjet. In females, a mandibular clockwise rotation and a backward displacement of the chin were noted. A greater retrusion of the upper and lower lips and a greater increase of the soft chin thickness were observed in males. Conclusion: Aging changes were more intense in the soft tissue compared to the skeletal and dentoalveolar structures. An expressive sexual dimorphism for craniofacial changes was observed during the maturational process.