Stability of anterior open bite non-extraction treatment in the paermanent dentition

Author(s)

Fabrício Pinelli Valarelli

• Document type: Master's Dissertation
• Press: Bauru. , ilustrações, tabelas.
• Institution: Universidade de São Paulo (USP). Faculdade de Odontologia de Bauru (FOB/SDB)
• Defense date: 2002-02-20

Examining board members

Guilherme dos Reis Pereira Janson; Osmar Aparecido Cuoghi; Arnaldo Pinzan

• Advisor: Guilherme dos Reis Pereira Janson
• Field of knowledge: Health Sciences - Dentistry
• Indexed in: Banco de Dados Bibliográficos da USP-DEDALUS; Biblioteca Digital de Teses e Dissertações - USP
• Location: Universidade de São Paulo. Faculdade de Odontologia de Bauru. Serviço de Biblioteca e Documentação Prof. Dr. Antônio Gabriel Atta; V23e

Abstract

The purpose of this study was to cephalometrically evaluate the longterm stability of anterior open bite non-extraction treatment in the permanent dentition after a mean period of 5 years. The experimental group consisted of 21 patients who had undergone orthodontic treatment with fixed appliances from whom cephalometric headplates were obtained at the pretreatment (T1), posttreatment (T2) and postretention (T3) stages. Two control groups were employed. The first, with a compatible age to the experimental group before treatment, was used only to characterize it. The second control group, with normal occlusion, was longitudinally followed, in a time period compatible to the posttretention period and was used for comparison of the changes between them, during this period. The differences between the observation stages in the experimental group were analyzed with paired t tests and the postretention changes were compared to the changes of the second control group with independent t tests. Results demonstrated a statistically significant relapse of the open bite at the end of the postretention period. The primary factors that contributed for the relapse were the smaller vertical development of the maxillary and mandibular incisors in the postretention period. However, 61,9% of the sample presented a “clinically stable" open bite correction. Neither the pretreatment anterior open bite amount or the magnitude of correction were associated with the long-term stability of the final treatment results. (AU)