A utilização de diferentes configurações de molas "T" para a obtenção de sistemas de forças otimizados

Thiesen, Guilherme; Rêgo, Marcus Vinícius Neiva Nunes do; Menezes, Luciane Macedo de; Shimizu, Roberto Hideo

doi:10.1590/s1415-54192006000500007

Cited by 5 publications

(13 citation statements)

References 13 publications

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“…6,7,12,15,17,21,25,27,28,30 On the one hand, mechanical tests 4,6,7,15,21,25,27,28,30 and the finite element 17 have proven that the Tspring can provide predictable results, thereby assuring its safe clinical use. On the other hand, clinical research 12 has demonstrated such efficiency through adequate results with no damage to adjacent tissues.…”

Section: Resultsmentioning

confidence: 99%

“…14 It has been used in orthodontics since 1935 30 to assess the types of tooth movement that take place when forces are delivered from different points to the teeth. Since then, much research has been conducted in all dental specialties using photoelasticity.…”

Section: Resultsmentioning

confidence: 99%

“…Moreover, when this end is inserted in the bracket slots an activation moment will be released. In 2006, Thiesen et al 30 reported that the greater the pre-activation bend, the greater the M/F ratio.…”

Section: Resultsmentioning

confidence: 99%

“…Hence the orthodontic community's interest in researching this type of orthodontic device from different angles, such as which wire cross-section to use, the type of alloy, moment/ force and load/deflection rations, the incorporation or not of helices into these springs, and height and length increases in its design. 6,7,12,15,20,21,22,25,27,28,30 FIGURE 15 -Representation of the mesial surface. After implementing the experimental photoelastic method for qualitative analysis of the force system delivered by centered T-springs fabricated with 0.017x0.025-in TMA wire, the following conclusions could be drawn: 1.…”

Section: Resultsmentioning

confidence: 99%

“…6,7,21,[25][26][27][28]30 This is due to the type of alloy used and the substantial quantity of wire incorporated into its design. Clinically, this is very positive since the amount of activation is considerable while the loss of force is relatively low when compared to other space closure devices.…”

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confidence: 99%

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

Maia

Gomes

Santos-Pinto

et al. 2011

Dental Press J. Orthod.

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Objective: To evaluate the force system generated by T-springs placed in the center of the interbracket space using the pre-activations advocated by Burstone. Methods: Photoelastic models were used to assess T-springs fabricated with 0.017x0.025-in rectangular titaniummolybdenum alloy wire (TMA), centrally positioned, with 6.0 mm activation, 3 mm activation, and in neutral position. To ensure reliable results, tests were repeated on three photoelastic models equally duplicated and fabricated by the same operator. An interbracket distance of 27.0 mm was used. For a better understanding of the results, the fringes were viewed in a polariscope, then photographed and qualitatively analyzed. Results: Through qualitative analysis of the fringe order in the photoelastic model it was noted that both the retraction and anchorage ends displayed force system symmetry across the full extent of the root. AbstractKeywords: Orthodontic space closure. Biomechanics.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

mentioning

confidence: 99%

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

Maia

Gomes

Santos-Pinto

et al. 2011

Dental Press J. Orthod.

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Mechanical evaluation of space closure loops in Orthodontics

Rodrigues¹,

Mikami²,

Filho³

et al. 2011

Braz. oral res.

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This study evaluated the mechanical performance of teardropshaped loops and teardrop-shaped loops with helix used in orthodontic space closure. Sixty retraction loops made with 0.019" x 0.025" stainless steel (SS) and beta-titanium (BT) wires were used. They were attached to a testing machine to measure the magnitudes of the sagittal force and the load-deflection ratio necessary for 1 mm, 2 mm and 3 mm activation. The results demonstrated that the BT alloy presented significantly smaller mean values (p < 0.01) of sagittal force and load-deflection than the SS alloy. The loop with the highest mean value of sagittal force and load-deflection was the teardrop-shaped loop (p < 0.01). Differences were observed in the mean values of sagittal force and load-deflection among activations, and the highest mean value was found in the activation of 3 mm, while the smallest mean value was evident in the activation of 1 mm (p < 0.01). It could be concluded that the metallic alloy used and the presence of a helix in configuration of the loops may have a strong influence on the sagittal force produced and on the load-deflection ratio; the teardrop-shaped loops and teardrop-shaped loops with helix in BT presented the release of lighter forces; the teardrop-shaped loop in SS generated a high load-deflection ratio, providing high magnitudes of horizontal force during its deactivation.

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Estudo qualitativo fotoelástico do sistema de forças gerado pela mola "T" de retração com diferentes pré-ativações

Maia

Gomes

Santos-Pinto

et al. 2010

Dental Press J. Orthod.

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OBJETIVO: avaliar o sistema de forças gerado pela mola T utilizada para fechamento de espaços. MÉTODOS: por meio do método experimental fotoelástico, avaliou-se a mola T utilizada no fechamento de espaços com duas variações de pré-ativação em sua porção apical, sendo uma com 30º e a outra com 45º. As molas foram confeccionadas com fio retangular de titânio-molibdênio (TMA) de secção 0,017" x 0,025", centralizadas no espaço interbraquetes de 27mm e ativadas em 5,0mm, 2,5mm e posição neutra. Para melhor confiabilidade dos resultados, os testes foram repetidos em três modelos fotoelásticos igualmente reproduzidos e confeccionados pelo mesmo operador. Para compreensão dos resultados, as franjas fotoelásticas visualizadas no polariscópio foram 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, a mola T com 30º de ativação apical apresentou um acúmulo de energia discretamente maior para o sistema de forças liberado.

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A utilização de diferentes configurações de molas "T" para a obtenção de sistemas de forças otimizados

Cited by 5 publications

References 13 publications

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

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

Mechanical evaluation of space closure loops in Orthodontics

Estudo qualitativo fotoelástico do sistema de forças gerado pela mola "T" de retração com diferentes pré-ativações

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