Objective:
The aim of this study was to evaluate the cyclic fatigue, torsional behavior and bending resistance of EdgeTaper Platinum [ETP (tip 25, taper 0.06)], Flex Gold [FG (tip 25, taper 0.08)], Pro-T [PT (tip 25, taper 0.08)] and ProTaper Gold [PTG (tip 25, taper 0.08)] systems.
Methods:
Rotary instruments of ETP, PT, FG, and PTG were used (n=30). Cyclic fatigue tests were performed using an artificial stainless-steel canal with a 60o angle and a 5-mm radius of curvature at body temperature (35°±1°C). The time and number of cycles to fracture (NCF) was recorded. The torsional test evaluated the torque and angle of rotation to failure at 3 mm from the tip according to ISO 3630-1. The fractured surface of each fragment was observed by using scanning electron microscopy (SEM). The bending test evaluated the torque required to bend the instruments at an angular deflection of 60°. Data were analyzed using one-way ANOVA and Tukey tests, and the level of significance was set at 5%.
Results:
The ETP had highest time until fracture and NCF than all the groups (P<0.05). The PTG had the highest torsional strength, followed by FG (P<0.05). The ETP had the highest angular rotation, followed by PT and PTG (P<0.05). The FG showed the highest bending resistance, followed by the PTG (P<0.05).
Conclusion:
In conclusion, the ETP and PT exhibited higher cyclic fatigue resistance, higher angular deflection values and lower bending force than FG and PTG. The PTG instruments showed the highest torsional strength and the lowest cyclic fatigue resistance.
A precisa determinação do comprimento real de trabalho é um fator importante para o êxito da terapia endodôntica,e depende de várias etapas,uma delas é a odontometria.As radiografias convencionais possuem limitações na precisão da localização do forame apical,mas com o avanço da tecnologia surgiram então dispositivos mais precisos que facilitam o dia a dia da clínica,chamados de localizadores foraminais que servem de complemento para a odontometria radiográfica.Inúmeros estudos demonstram que os localizadores foraminais são recomendados devido sua eficácia e confiabilidade. O método de funcionamento desses dispositivos está diretamente ligado com a diferença de condutividade elétrica de um instrumento metálico no interior do canal radicular e à condutividade do tecido periapical quando submetidos a componentes elétricos como resitência,frequência ou impedância.Os localizadores foraminais podem ser usados em diversas situações na prática clínica,bem como em dentes decíduos,dentes vitais e não vitais,e até em retratamento .O objetivo deste estudo é analisar mediante revisão de literatura,a eficácia e confiabilidade dos localizadores foraminais na determinação do comprimento real de trabalho durante a terapia endodôntica.
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