Photoelastic evaluation of the surgically assisted rapid maxilary expansion using different othodontic anchorages

Author(s)

Sergio Monteiro Lima Júnior

• Document type: Master's Dissertation
• Press: Piracicaba, SP.
• Institution: Universidade Estadual de Campinas (UNICAMP). Faculdade de Odontologia de Piracicaba
• Defense date: 2010-03-03

Examining board members

Luciana Asprino; Leandro Eduardo Klüppel; Roger William Fernandes Moreira

• Advisor: Marcio de Moraes; Luciana Asprino

Abstract

The aim of this study was to evaluate how variations in the design of the orthodontic appliances and their anchorages would influence the distribution of forces along the cranial bones through a photoelastic skull model during the surgically assisted maxillary expansion with and without pterygoid splitting. It was used six different expanders in the tests. Three of them were Hyrax aplliances, with anchorage at first bicuspids and first molars (H1), canines and first molars (H2) and canines and second molars (H3). The three Haas appliances had the same anchorage patterns described above (A1, A2, A3). The three Haas appliances were submitted to a load peak test to evaluate the forces in the orthopedic range (> 500 grams). The photoelastic analysis revealed that Haas expanders generated similar anterior and posterior fringe patterns, while anchorage at first bicuspids and first molars created stress at the posterior region of the maxilla. The splitting of the pterygoid plates lowered the tension necessary for SARME. In conclusion, Haas expanders showed better distribution of tension lines in the maxilla, without higher concentration of tension in and around the teeth; variation on the anchorage does not influence the final result and release of all anatomic resistance, including pterygoid plates splitting facilitates the expansion movement. (AU)

• FAPESP's process: 08/03238-0 - PHOTOELASTIC EVALUATION OF TWO DIFFERENT TECHNIQUES OF SURGICALLY ASSISTED RAPID MAXLLARY EXPANSION USING DIFFEENT METHODS OF ORTHODONTIC ANCHORAGE
• Grantee: Sergio Monteiro Lima Júnior
• Support Opportunities: Scholarships in Brazil - Master