In:
Dental Press Journal of Orthodontics, FapUNIFESP (SciELO), Vol. 15, No. 4 ( 2010-08), p. 103-116
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 T-spring-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 and 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 fringe 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.
Type of Medium:
Online Resource
ISSN:
2176-9451
DOI:
10.1590/S2176-94512010000400015
Language:
Unknown
Publisher:
FapUNIFESP (SciELO)
Publication Date:
2010
detail.hit.zdb_id:
2721511-8
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