Banca de DEFESA: CAROLINA GOMES DE MENEZES

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
DISCENTE : CAROLINA GOMES DE MENEZES
DATA : 30/08/2019
HORA: 14:00
LOCAL: Departamento de Odontologia
TÍTULO:

CYCLICAL FATIGUE RESISTANCE OF RECIPROCANT INSTRUMENTS MANUFACTURED WITH NICKEL-TITANIUM ALLOYS SUBMITTED TO DIFFERENT THERMAL TREATMENTS

PALAVRAS-CHAVES:

Cyclic fatigue; reciprocating motion; reciprocating systems; nickel-titanium alloy.

PÁGINAS: 38
GRANDE ÁREA: Ciências da Saúde
ÁREA: Odontologia
SUBÁREA: Endodontia
RESUMO:

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.

MEMBROS DA BANCA:
Presidente - 1879551 - FABIO ROBERTO DAMETTO
Externa ao Programa - 6349819 - REJANE ANDRADE DE CARVALHO
Externo à Instituição - VICTOR TALARICO LEAL VIEIRA - Unigranrio