Bibliographic Details
| Title: |
Cyclic and torsional fatigue resistance of five NiTi rotary instruments manufactured with different thermal treatments and cross-section designs. |
| Alternate Title: |
Resistência à fadiga cíclica e torcional de cinco instrumentos rotatórios de NiTi fabricados com diferentes tratamentos térmicos e secções transversais. |
| Authors: |
de OLIVEIRA NETO, Raimundo Sales1 cdraimundoneto@hotmail.com, Hungaro DUARTE, Marco Antonio1, Ricci VIVAN, Rodrigo1, Oliveira LIMA, Thaine1, Jovedi ROSA, Stefani1, Isidro Teves CORDOVA, Abel Victor1, Barreto OSAKI, Roberto1, Priori ALCALDE, Murilo1 |
| Source: |
Dental Press Endodontics. Jan-Apr2024, Vol. 14 Issue 1, p9-28. 40p. |
| Subjects: |
FATIGUE limit, CYCLIC fatigue, NICKEL-titanium alloys |
| Abstract (English): |
Objectives: The aim of the study was to assess the cyclic and torsional fatigue resistance of five NiTi rotary instruments manufactured with different thermal treatments and cross-section designs. Methods: One hundred instruments (n=20)—Pro Flexi File Chameleon 25.06 (PFC 25.06), Univy New 25.06 (UN 25.06), MG3 Gold 25.06 (MG3 25.06), Rotate 25.06 (ROT 25.06), and ProTaper Gold 25.08 (PTG 25.08) were submitted to a cyclic fatigue test using an artificial stainless-steel. The time to fracture (TTF) and number of cycles to fracture (NCF) were recorded. Torsional fatigue was assessed maximum torsional strength (N.cm) and angular deflection (°) within 3 mm from the tip (ISO 3630-1). Scanning electron microscopy examined fractured surfaces. Data were analyzed using one-way ANOVA and Tukey's tests (p<0.05). Results: Cyclic fatigue revealed significant differences in TTF and NCF (p<0.05). PFC 25.06 and ROT 25.06 exhibited the highest TTF (p<0.05), while MG3G 25.08 and PTG 25.08 showed the lowest TFF and NCF (p<0.05). Torsional fatigue indicated ROT 25.06 had the lowest torsional strength and the highest angular deflection (p<0.05). PFC 25.06, UN 25.06, and PTG 25.08 displayed similar torsional properties (p>0.05). Scanning electron microscopy demonstrated typical features of cyclic and torsional failure for all instruments. Conclusions: The instruments demonstrated significant differences in cyclic and torsional fatigue resistance. PFC 25.06 and ROT 25.06 exhibited superior cyclic fatigue resistance, while PFC 25.06, PTG 25.08, MG3G 25.06, and UN 25.06 displayed similar torsional properties. [ABSTRACT FROM AUTHOR] |
| Abstract (Portuguese): |
Objetivos: O objetivo desse estudo foi avaliar a resistência à fadiga cíclica e torcional de cinco instrumentos rotatórios de níquel-titânio (NiTi) com diferentes tratamentos térmicos e secções transversais. Métodos: Cem instrumentos (n=20 cada grupo) — Pro Flexi File Chameleon 25.06 (PFC 25.06), Univy New 25.06 (UN 25.06), MG3 Gold 25.06 (MG3 25.06), Rotate 25.06 (ROT 25.06) e ProTaper Gold 25.08 (PTG 25.08) — foram submetidos à fadiga cíclica em um canal artificial de aço inoxidável com 60° de curvatura e 5 mm de raio. O tempo até a fratura (TTF) e o número de ciclos até a fratura (NCF) foram registrados. A fadiga torcional avaliou a máxima resistência torcional (N.cm) e a deflexão angular (em graus) dos 3 mm da ponta (ISO 3630-1). As superfícies fraturadas foram avaliadas sob microscopia eletrônica de varredura (MEV). Os dados foram analisados por meio de ANOVA unidirecional e testes de Tukey (p<0,05). Resultados: A fadiga cíclica revelou diferenças significativas no TTF e no NCF (p<0,05). PFC 25.06 e ROT 25.06 apresentaram o maior TTF (p<0,05), enquanto MG3 25.06 e PTG 25.08 mostraram os menores TFF e NCF (p<0,05). A fadiga torcional indicou que ROT 25.06 teve a menor resistência torcional e a maior deflexão angular (p<0,05). PFC 25.06, UN 25.06 e PTG 25.08 exibiram propriedades torcionais semelhantes (p>0,05). A MEV mostrou características típicas de falha cíclica e torcional para todos os instrumentos. Conclusões: Os instrumentos apresentaram diferenças significativas na resistência à fadiga cíclica e torcional. PFC 25.06 e ROT 25.06 exibiram resistência superior à fadiga cíclica, enquanto PFC 25.06, PTG 25.08, MG3 25.06 e UN 25.06 apresentaram propriedades torcionais semelhantes. [ABSTRACT FROM AUTHOR] |
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| Database: |
MedicLatina |
