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- Title
Qualitative photoelastic study of the force system produced by retraction T-springs with different preactivations.
- Authors
Maia, Luiz Guilherme Martins; Gomes, Vanderlei Luiz; Dos Santos-Pinto, Ary; Lopes Júnior, Itamar; Gandini Jr., Luiz Gonzaga
- Abstract
Abstract Objective: Evaluate the force system produced by the T-spring used for space closure. Methods: By means of the experimental photoelastic method, we evaluated the Tspring-- used for space closure--with two different preactivations on its apical portion, i.e., one with 30° and one with 45º. The springs were fabricated with rectangular 0.017 X 0.025-in titanium-molybdenum alloy (TMA), centered in a 27.0 mm interbracket space and activated at 5.0 mm, at 2.5 mm, and in a neutral position. For more reliable results, tests were repeated on three photoelastic models duplicated and prepared by the same operator. To better understand the results, the fringes seen in the polariscope were photographed and analyzed qualitatively. Results: Through qualitative analysis of the fringes order in the photoelastic model it was noted that at the retraction and anchoring ends the T-spring with 30° apical activation showed a slightly greater accumulation of energy relative to the force system that was generated.
- Subjects
PHOTOELASTICITY; MOLYBDENUM alloys; MOLYBDENUM; POLARISCOPE; TITANIUM
- Publication
Dental Press Journal of Orthodontics, 2010, Vol 15, Issue 4, p103
- ISSN
2176-9451
- Publication type
Article
- DOI
10.1590/S2176-94512010000400015