Influence of different kinematics on stationary and dynamic torsional behavior of JIZAI nickel-titanium rotary instruments: An in vitro study.
Nickel-titanium rotary instrumentation
Optical torque reverse motion
Reciprocation
Screw-in force
Stationary and dynamic tests
Torque
Journal
Journal of dental sciences
ISSN: 2213-8862
Titre abrégé: J Dent Sci
Pays: Netherlands
ID NLM: 101293181
Informations de publication
Date de publication:
Jul 2023
Jul 2023
Historique:
received:
09
09
2022
revised:
03
10
2022
accepted:
06
10
2022
medline:
5
7
2023
pubmed:
5
7
2023
entrez:
5
7
2023
Statut:
ppublish
Résumé
Using conventional approach to examine stationary torque of nickel-titanium rotary instruments contradicts the clinical condition, and its validity for motions involving clockwise and counterclockwise rotations is questionable. This study aimed to examine the effect of different kinematics on the torsional behavior using a JIZAI instrument (#25/.04) under stationary/dynamic test conditions using clinical torque limit settings. In the stationary test, the 5-mm tip of JIZAI was fixed in a cylinder-shaped vise and rotated in continuous rotation (CR) with auto-torque-reverse, optimum-torque-reverse (OTR), or reciprocation (REC) until fracture (n = 10, each). In the dynamic test, straight and severe curved canals were instrumented with JIZAI using the single-length technique with CR, OTR, or REC (n = 10, each). The stationary torque at fracture, time to fracture (T The kinematics did not influence the stationary or dynamic torques ( Under the present experimental conditions, parameters other than torque showed significant effects on different kinematics. The dynamic torque and screw-in force of OTR were similar to the other rotational modes and not influenced by the canal curvature.
Sections du résumé
Background/purpose
UNASSIGNED
Using conventional approach to examine stationary torque of nickel-titanium rotary instruments contradicts the clinical condition, and its validity for motions involving clockwise and counterclockwise rotations is questionable. This study aimed to examine the effect of different kinematics on the torsional behavior using a JIZAI instrument (#25/.04) under stationary/dynamic test conditions using clinical torque limit settings.
Materials and methods
UNASSIGNED
In the stationary test, the 5-mm tip of JIZAI was fixed in a cylinder-shaped vise and rotated in continuous rotation (CR) with auto-torque-reverse, optimum-torque-reverse (OTR), or reciprocation (REC) until fracture (n = 10, each). In the dynamic test, straight and severe curved canals were instrumented with JIZAI using the single-length technique with CR, OTR, or REC (n = 10, each). The stationary torque at fracture, time to fracture (T
Results
UNASSIGNED
The kinematics did not influence the stationary or dynamic torques (
Conclusion
UNASSIGNED
Under the present experimental conditions, parameters other than torque showed significant effects on different kinematics. The dynamic torque and screw-in force of OTR were similar to the other rotational modes and not influenced by the canal curvature.
Identifiants
pubmed: 37404613
doi: 10.1016/j.jds.2022.10.005
pii: S1991-7902(22)00257-4
pmc: PMC10316443
doi:
Types de publication
Journal Article
Langues
eng
Pagination
1170-1176Informations de copyright
© 2022 Association for Dental Sciences of the Republic of China. Publishing services by Elsevier B.V.
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