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Publication
Avaliação da resistência à fadiga ciclíca de limas reciprocantes na instrumentação de canais curvos : estudo in vitro
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Advisor(s)
Abstract(s)
O objetivo deste estudo foi avaliar in vitro, num bloco de aço inox, a resistência à fadiga
cíclica de três sistemas de limas endodônticas reciprocantes de níquel-titânio durante o
movimento rotoatório: Reverso Silver®, WaveOne Gold® e Reciproc®
Método: Seis grupos de oito instrumentos foram utilizados num canal artificial, que foi
feito com um raio de curvatura de 5mm e comprimento de arco com 6 mm, 60 curvatura.
Os instrumentos foram testados de acordo com as recomendações do fabricante. O
Reciproc Blueâ R25 foi usado a uma velocidade de 300rpm, enquanto o Reverso Silver®
F2 300 rpm e o Wave OneGold® Primary com 350 rpm. O número de ciclos para fratura
foi calculado medindo o tempo até à fratura. As características topográficas das superfícies dos instrumentos quebrados foram digitalizadas com um microscópio
eletrónico.
Os resultados obtidos foram submetidos ao teste de normalidade Shapiro Wilk, que
indicou uma distribuição normal da amostra. Com base neste achado, estes dados foram
submetidos à análise de variância de duas vias (two-way ANOVA), com teste complementar de Tukey para comparações múltiplas.
Resultados: Os instrumentos Reciproc Blue apresentaram um número significativamente
maior de ciclos até à falha, do que os outros instrumentos
Conclusão:
- A fratura ocorre no ponto de flexão máxima, curvatura
- A resistência à fadiga dos instrumentos RB® foi melhor que a dos instrumentos WOG® e Reverso Silver®.
- A resistência das limas WOG® foi melhor que as limas Reverso silver®
- Existe uma diferença significativa entre os dois movimentos testados, no entanto, os limas RB® permanecem mais eficientes em todos os casos
- A fadiga cíclica dos RB® testados no movimento reciprocante é maior que os outros instrumentos em ambos os movimentos. Deixando a conclusão de que a transformação térmica e o movimentos das liga são dois fatores igualmente importantes.
The aim of this study was to estimate, in vitro, with a stainless bloc, the cyclic fatigue resistance of three systems of nickel-titanium reciprocating endodontic files : Reverso Silver®, WaveOne® and Reciproc Blue® in two different movements Method : Six groups of seven instruments were used in an artificial canal, which was made with a radius of curvature of 5mm and arc length of 6 mm, 60 curvature. The files were tested according to manufacturers recommendations. Reciproc Blue® R25 was used at a rate of 300 rpm, while ReversoSilver® 300 rpm, and Wave OneGold Primary® files 350 rpm. The number of cycles to fracture was calculated, measuring the time until fracture. The topographic features of the surfaces of broken instruments was scanned with an electronic microscope. The results were submitted to the Shapiro Wilk normality test, which indicated a normal distribution of the sample (p> 0.05). Based on this finding, these data were submitted to two-way ANOVA, with Tukey's complementary test for multiple comparisons Results: Reciproc blue® instruments had a significantly greater number of cycles to failure than the others instruments in all groups; Conclusion: - the fracture takes place in the point of maximum flexion, in curvature - The fatigue resistance of RBâ instruments was higher than that of WOG® e Reverso Silver® instruments. - The fatigue resistance of WOG® was higher that that of reverse silver - Existe uma diferença significativa between the two movements tested, reciproc blue files remain more efficient in all cases - the cyclic fatigue of wires RB® tested in reciprocatin movement is higher than in other wires in both movements. Leaving conclusion that transformation termic of the alloy and movments rotatório are two equally importante factos
The aim of this study was to estimate, in vitro, with a stainless bloc, the cyclic fatigue resistance of three systems of nickel-titanium reciprocating endodontic files : Reverso Silver®, WaveOne® and Reciproc Blue® in two different movements Method : Six groups of seven instruments were used in an artificial canal, which was made with a radius of curvature of 5mm and arc length of 6 mm, 60 curvature. The files were tested according to manufacturers recommendations. Reciproc Blue® R25 was used at a rate of 300 rpm, while ReversoSilver® 300 rpm, and Wave OneGold Primary® files 350 rpm. The number of cycles to fracture was calculated, measuring the time until fracture. The topographic features of the surfaces of broken instruments was scanned with an electronic microscope. The results were submitted to the Shapiro Wilk normality test, which indicated a normal distribution of the sample (p> 0.05). Based on this finding, these data were submitted to two-way ANOVA, with Tukey's complementary test for multiple comparisons Results: Reciproc blue® instruments had a significantly greater number of cycles to failure than the others instruments in all groups; Conclusion: - the fracture takes place in the point of maximum flexion, in curvature - The fatigue resistance of RBâ instruments was higher than that of WOG® e Reverso Silver® instruments. - The fatigue resistance of WOG® was higher that that of reverse silver - Existe uma diferença significativa between the two movements tested, reciproc blue files remain more efficient in all cases - the cyclic fatigue of wires RB® tested in reciprocatin movement is higher than in other wires in both movements. Leaving conclusion that transformation termic of the alloy and movments rotatório are two equally importante factos
Description
Dissertação para obtenção do grau de Mestre no Instituto Universitário Egas Moniz
Keywords
Reciproc blue WaveoneGold Fadiga cíclica Reciprocante Continuo