masterThesis
Resistência em fadiga cíclica de instrumentos reciprocantes fabricados com ligas de niquel-titânio submetidas a diferentes tratamentos térmicos
Fecha
2019-09-06Registro en:
MENEZES, Carolina Gomes de. Resistência em fadiga cíclica de instrumentos reciprocantes fabricados com ligas de niquel-titânio submetidas a diferentes tratamentos térmicos. 2019. 40f. Dissertação (Mestrado em Ciências Odontológicas) - Centro de Ciências da Saúde, Universidade Federal do Rio Grande do Norte, Natal, 2019.
Autor
Menezes, Carolina Gomes de
Resumen
Objectives: This study aimed to evaluate and compare the resistance in cyclic fatigue of three
types of single file reciprocating systems: WaveOne Gold Primary (25 / 0.07), WA1 file (25 /
0.07) and X1 Blue (25 / 0.06), made of nickel-titanium alloys with different surface thermal
treatments, and compare Reciproc All and WaveOne All programs, regarding the fatigue life
of the three systems tested. Methods: A sample of sixty instruments measuring 25 mm long,
with a D0 diameter of 0.25 mm and an approximate conicity of 0,07 mm/mm, was divided
into two groups. Each group contained thirty instruments, being ten of each mechanized
system. One group was tested in the Reciproc All program and the other one in the WaveOne
All of the Silver Reciproc motor (VDW). The resistance to Cyclic fatigue was tested by
measuring the time and number of cycles which the instrument performed in an extremely
curved stainless steel artificial channel (angle 86° and 6 mm radius) until fracture was
reached. The fractured surfaces of the fragments of three instruments, one of each system,
randomly chosen in each group, were examined with a scanning electron microscope. The
results were statistically analyzed using analysis of variance (ANOVA) and the F and Turkey
tests with significance levels of 5%. Results: The 1 File instrument had a longer fatigue life,
both in the Reciproc All program and in the WaveOne All program, than the other two
systems tested (p < 0.05). WaveOne Gold Primary presented a cyclic fatigue life longer than
the X1 Blue file in the two tested programs (p < 0.05). Conclusion: The WA1 instrument
presented higher resistance to cyclic fatigue in severely curved channels when used in both
Reciproc All and WaveOne All programs than WaveOne Gold Primary and X1 Blue File
systems. The Reciproc All program presented better results for life cycle in rotating flexion
for the three reciprocating systems tested when compared to the WaveOne All program.