Publicação
Fatigue life of protaper gold RM instruments: an in vitro study
| Resumo: | Introduction: Nickel-titanium instruments were introduced to facilitate canal preparation. Despite its advantages, instrument separation remains a major concern in endodontics due to several factors. There are many systems of endodontic files and the purpose of this study was to characterize the cyclic fatigue of ProTaper GoldRM (PTG) instruments and compare it to Protaper® Universal (PTU) and other rotary systems. Materials and Methods: Forty-eight rotary nickel-titanium files of PTG and PTU systems were analyzed in this study. Those were divided into four experimental groups, according to type of system and instrument (PTG F2, PTG F2, PTG F3, PTU F2 and PTU F3). A mechanical device was used to simulate the root canal system with a radius of curvature of 4, 7 mm and an angle of curvature of 45˚. Each instrument was submitted to testing with rotational speed of 300 rpm and a torque of 4 N. cm. Testing time was registered when tip separation occurred. Data obtained such as time to fracture of the instrument tested and number of cycles to fracture (NCF) was statically analyzed by t-student test. For fracture length the non-parametric U-Whitman test was used. PTG and ProTaper NextTM (PTN) data from Vaz 2014 study were analyzed with the same tests. Significance was set at 95% confidence level. Results: PTG F2 instrument proved to be statistically more resistant to cyclic fatigue than instruments PTG F3, PTU F2 and PTN X2. Discussion and Conclusions: Compared with different rotary systems such as PTU and PTN, this system suggests being more resistant to cyclic fatigue. During clinical practice, clinicians should be aware of the mechanical properties of the instruments chosen and take into account the higher resistance to cyclic fatigue of ProTaper GoldRM files when compared to other systems. |
|---|---|
| Autores principais: | Pereira, Fátima Carolina Ferreira |
| Assunto: | Medicina dentária Endodontia Teses de mestrado - 2015 |
| Ano: | 2015 |
| País: | Portugal |
| Tipo de documento: | dissertação de mestrado |
| Tipo de acesso: | acesso aberto |
| Instituição associada: | Universidade de Lisboa |
| Idioma: | inglês |
| Origem: | Repositório da Universidade de Lisboa |
| Resumo: | Introduction: Nickel-titanium instruments were introduced to facilitate canal preparation. Despite its advantages, instrument separation remains a major concern in endodontics due to several factors. There are many systems of endodontic files and the purpose of this study was to characterize the cyclic fatigue of ProTaper GoldRM (PTG) instruments and compare it to Protaper® Universal (PTU) and other rotary systems. Materials and Methods: Forty-eight rotary nickel-titanium files of PTG and PTU systems were analyzed in this study. Those were divided into four experimental groups, according to type of system and instrument (PTG F2, PTG F2, PTG F3, PTU F2 and PTU F3). A mechanical device was used to simulate the root canal system with a radius of curvature of 4, 7 mm and an angle of curvature of 45˚. Each instrument was submitted to testing with rotational speed of 300 rpm and a torque of 4 N. cm. Testing time was registered when tip separation occurred. Data obtained such as time to fracture of the instrument tested and number of cycles to fracture (NCF) was statically analyzed by t-student test. For fracture length the non-parametric U-Whitman test was used. PTG and ProTaper NextTM (PTN) data from Vaz 2014 study were analyzed with the same tests. Significance was set at 95% confidence level. Results: PTG F2 instrument proved to be statistically more resistant to cyclic fatigue than instruments PTG F3, PTU F2 and PTN X2. Discussion and Conclusions: Compared with different rotary systems such as PTU and PTN, this system suggests being more resistant to cyclic fatigue. During clinical practice, clinicians should be aware of the mechanical properties of the instruments chosen and take into account the higher resistance to cyclic fatigue of ProTaper GoldRM files when compared to other systems. |
|---|