Evidence for reduced torsional resistance of rotary files under curved position

Objectives: The aim of this in vitro study was to investigate the torsional fatigue resistance of different rotary files in straight and curved positions at a simulated intracanal temperature. Methods: Forty-eight size #25 files from ProTaper Universal (PTU), ProTaper Next (PTN) and ProTaper Gold (P...

Descripción completa

Guardado en:

Detalles Bibliográficos
Autores principales:	Ahmed Jamleh, Raghad Almedlej, Rasha Alomar, Nouf Almayouf, Abdulmohsen Alfadley, Khalid Alfouzan
Formato:	article
Lenguaje:	EN
Publicado:	Elsevier 2021
Materias:	Curved position Torsional resistance ProTaper Gold ProTaper Next ProTaper Universal Medicine R Dentistry RK1-715
Acceso en línea:	https://doaj.org/article/0d0129c081d44be38712442694deb061
Etiquetas:	Agregar Etiqueta Sin Etiquetas, Sea el primero en etiquetar este registro!

id	oai:doaj.org-article:0d0129c081d44be38712442694deb061
record_format	dspace
spelling	oai:doaj.org-article:0d0129c081d44be38712442694deb0612021-11-10T04:19:07ZEvidence for reduced torsional resistance of rotary files under curved position1013-905210.1016/j.sdentj.2020.07.005https://doaj.org/article/0d0129c081d44be38712442694deb0612021-11-01T00:00:00Zhttp://www.sciencedirect.com/science/article/pii/S101390522030746Xhttps://doaj.org/toc/1013-9052Objectives: The aim of this in vitro study was to investigate the torsional fatigue resistance of different rotary files in straight and curved positions at a simulated intracanal temperature. Methods: Forty-eight size #25 files from ProTaper Universal (PTU), ProTaper Next (PTN) and ProTaper Gold (PTG) were tested for torsional resistance in both straight and curved (90 degrees) positions (n = 8 each). The experiment was conducted at a simulated intracanal temperature of 35 ± 1 °C. The torque gauge was reset before every use, and uniform torsional stress was applied by rotating the file clockwise at a speed of 40 rpm until fracture. Torque failure values were recorded, and fractured surfaces were tested using a scanning electron microscopy (SEM). Statistical analysis of the data was completed using one-way ANOVA and post-hoc test (LSD) in order to compare between the tested systems in each file position. Student’s t-test was also performed to compare between the two positions in each rotary system, and significance level was set at 5%. Results: In the straight position, torsional resistance of PTN was significantly lower than that of PTU and PTG (p < 0.001), while the PTU and PTG had comparable results (p > 0.05). In the curved position, torsional resistance was found to be comparable among all systems (p > 0.05). Within each system, the curved position resulted in a significantly lower torsional resistance when compared to the straight position (p < 0.001). SEM examination revealed similar torsional failure behavior for all files tested under both positions. Conclusions: Our study identified that placing files in a curved position was associated with a significant decrease in torsional resistance of all systems, and this necessitates reconsidering the torque settings proposed by the manufacturers. Whether these effects can be translated into in vivo studies remains to be investigated, and thus future studies are essential to provide confirming evidence.Ahmed JamlehRaghad AlmedlejRasha AlomarNouf AlmayoufAbdulmohsen AlfadleyKhalid AlfouzanElsevierarticleCurved positionTorsional resistanceProTaper GoldProTaper NextProTaper UniversalMedicineRDentistryRK1-715ENSaudi Dental Journal, Vol 33, Iss 7, Pp 614-619 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Curved position Torsional resistance ProTaper Gold ProTaper Next ProTaper Universal Medicine R Dentistry RK1-715
spellingShingle	Curved position Torsional resistance ProTaper Gold ProTaper Next ProTaper Universal Medicine R Dentistry RK1-715 Ahmed Jamleh Raghad Almedlej Rasha Alomar Nouf Almayouf Abdulmohsen Alfadley Khalid Alfouzan Evidence for reduced torsional resistance of rotary files under curved position
description	Objectives: The aim of this in vitro study was to investigate the torsional fatigue resistance of different rotary files in straight and curved positions at a simulated intracanal temperature. Methods: Forty-eight size #25 files from ProTaper Universal (PTU), ProTaper Next (PTN) and ProTaper Gold (PTG) were tested for torsional resistance in both straight and curved (90 degrees) positions (n = 8 each). The experiment was conducted at a simulated intracanal temperature of 35 ± 1 °C. The torque gauge was reset before every use, and uniform torsional stress was applied by rotating the file clockwise at a speed of 40 rpm until fracture. Torque failure values were recorded, and fractured surfaces were tested using a scanning electron microscopy (SEM). Statistical analysis of the data was completed using one-way ANOVA and post-hoc test (LSD) in order to compare between the tested systems in each file position. Student’s t-test was also performed to compare between the two positions in each rotary system, and significance level was set at 5%. Results: In the straight position, torsional resistance of PTN was significantly lower than that of PTU and PTG (p < 0.001), while the PTU and PTG had comparable results (p > 0.05). In the curved position, torsional resistance was found to be comparable among all systems (p > 0.05). Within each system, the curved position resulted in a significantly lower torsional resistance when compared to the straight position (p < 0.001). SEM examination revealed similar torsional failure behavior for all files tested under both positions. Conclusions: Our study identified that placing files in a curved position was associated with a significant decrease in torsional resistance of all systems, and this necessitates reconsidering the torque settings proposed by the manufacturers. Whether these effects can be translated into in vivo studies remains to be investigated, and thus future studies are essential to provide confirming evidence.
format	article
author	Ahmed Jamleh Raghad Almedlej Rasha Alomar Nouf Almayouf Abdulmohsen Alfadley Khalid Alfouzan
author_facet	Ahmed Jamleh Raghad Almedlej Rasha Alomar Nouf Almayouf Abdulmohsen Alfadley Khalid Alfouzan
author_sort	Ahmed Jamleh
title	Evidence for reduced torsional resistance of rotary files under curved position
title_short	Evidence for reduced torsional resistance of rotary files under curved position
title_full	Evidence for reduced torsional resistance of rotary files under curved position
title_fullStr	Evidence for reduced torsional resistance of rotary files under curved position
title_full_unstemmed	Evidence for reduced torsional resistance of rotary files under curved position
title_sort	evidence for reduced torsional resistance of rotary files under curved position
publisher	Elsevier
publishDate	2021
url	https://doaj.org/article/0d0129c081d44be38712442694deb061
work_keys_str_mv	AT ahmedjamleh evidenceforreducedtorsionalresistanceofrotaryfilesundercurvedposition AT raghadalmedlej evidenceforreducedtorsionalresistanceofrotaryfilesundercurvedposition AT rashaalomar evidenceforreducedtorsionalresistanceofrotaryfilesundercurvedposition AT noufalmayouf evidenceforreducedtorsionalresistanceofrotaryfilesundercurvedposition AT abdulmohsenalfadley evidenceforreducedtorsionalresistanceofrotaryfilesundercurvedposition AT khalidalfouzan evidenceforreducedtorsionalresistanceofrotaryfilesundercurvedposition
_version_	1718440624914432000

Evidence for reduced torsional resistance of rotary files under curved position

Ejemplares similares