Avaliação qualitativa em modelo experimental fotoelástico do sistema de força gerado pela mola "T" centralizada com pré-ativações preconizadas por Burstone

Luiz Guilherme Martins Maia,Luiz Gonzaga Gandini-Jr,Vanderlei Luiz Gomes,André Da Costa Monini,Ary Dos Santos-Pinto

doi:10.1590/s2176-94512011000100017

Abstract

OBJETIVO: avaliar o sistema de forças gerado pela mola T centralizada no espaço interbraquete, com pré-ativação preconizada por Burstone. MÉTODOS: utilizando-se modelos fotoelásticos, a mola T com pré-ativações preconizadas por Burstone, confeccionada com fio retangular de titânio-molibdênio (TMA) de secção 0,017"x 0,025", centralizada e com ativação de 6mm, 3mm e em posição neutra. Para melhor confiabilidade dos resultados, os testes foram repetidos em três modelos igualmente duplicados e confeccionados pelo mesmo operador. Utilizou-se uma distância interbraquetes de 27mm. Para compreensão dos resultados, as franjas foram visualizadas através do polariscópio, fotografadas e analisadas qualitativamente. RESULTADOS: por meio da análise qualitativa da ordem de franjas no modelo fotoelástico, notou-se que, nas extremidades de retração e ancoragem, ambas apresentaram simetria no sistema de força, em toda extensão radicular.

Highlights

When orthodontic treatment is administered with the aid of a detailed diagnosis premolar extraction is sometimes performed, which requires that orthodontists have an accurate knowledge of biomechanics for the closure of remaining spaces but of histological, anatomical and physiological principles.[24]
Orthodontic literature has shown that several techniques are currently used for assessing the force system generated by the T-spring.[6,7,12,15,17,21,25,27,28,30]
Evaluation of the force system generated by the T-spring was performed according to the pre-activations suggested by Burstone,[6] with the T-spring centered in the interbracket space and using the photoelastic experimental method for qualitative analysis of pressure and stress areas.[1,2,8,9,10,11,14,16,19,23,29]

Summary

Introduction

When orthodontic treatment is administered with the aid of a detailed diagnosis premolar extraction is sometimes performed, which requires that orthodontists have an accurate knowledge of biomechanics for the closure of remaining spaces but of histological, anatomical and physiological principles.[24]. ** Assistant Professor of Orthodontics, Department of Child Clinic, School of Dentistry, Araraquara - UNESP. Post-doctorate and Assistant Associate Clinical Professor, Department of Orthodontics, Baylor College Of Dentistry-Dallas-TX. *** Head Professor, Removable Prosthodontics and Dental Materials, School of Dentistry, Federal University of Uberlândia. MSc and PhD in Dentistry, USP Ribeirão Preto - São Paulo. **** Specialist and Master in Orthodontics, Faculty of Dentistry of Araraquara / UNESP. Student in the Postgraduate (PhD), UNESP / FOAr. ***** Adjunct Professor/Assistant of Orthodontics Discipline of the Department of Child Clinical, Faculty of Dentistry of Araraquara - UNESP. Postdoctoral and Assistant Clinical Professor, Department of Orthodontics, Baylor College of Dentistry-Dallas-TX

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Conclusion