Effect of repetitive up-and-down movements on torque/force generation, surface defects and shaping ability of nickel-titanium rotary instruments: an ex vivo study.
Canal centering ability
Microcomputed tomography
Nickel-titanium rotary instrumentation
Screw-in force
Torque
Up-and-down movement
Journal
BMC oral health
ISSN: 1472-6831
Titre abrégé: BMC Oral Health
Pays: England
ID NLM: 101088684
Informations de publication
Date de publication:
23 Aug 2024
23 Aug 2024
Historique:
received:
08
05
2024
accepted:
30
07
2024
medline:
24
8
2024
pubmed:
24
8
2024
entrez:
23
8
2024
Statut:
epublish
Résumé
The screw-in effect is a tendency of a nickel-titanium (NiTi) rotary endodontic file to be pulled into the canal, which can result in a sudden increase in stress leading to instrument fracture, and over-instrumentation beyond the apex. To reduce screw-in force, repeated up-and-down movements are recommended to distribute flexural stress during instrumentation, especially in curved and constricted canals. However, there is no consensus on the optimal number of repetitions. Therefore, this study aimed to examine how repeated up-and-down movements at the working length affect torque/force generation, surface defects, and canal shaping ability of JIZAI and TruNatomy instruments. An original automated root canal instrumentation device was used to prepare canals and to record torque/force changes. The mesial roots of human mandibular molars with approximately 30˚ of canal curvature were selected through geometric matching using micro-computed tomography. The samples were divided into three groups according to the number of up-and-down movements at the working length (1, 3, and 6 times; n = 24 each) and subdivided according to the instruments: JIZAI (#13/0.04 taper, #25/0.04 taper, and #35/0.04 taper) or TruNatomy (#17/0.02 taper, #26/0.04 taper, and #36/0.03 tape) (n = 12 each). The design, surface defects, phase transformation temperatures, nickel-titanium ratios, torque, force, shaping ability, and surface deformation were evaluated. Data were analyzed with the Kruskal-Wallis and Dunn's tests (α = 0.05). The instruments had different designs and phase transformation temperatures. The 3 and 6 up-and-down movements resulted in a smaller upward force compared to 1 movement (p < 0.05). TruNatomy generated significantly less maximum torque, force, and surface wear than JIZAI (p < 0.05). However, TruNatomy exhibited a larger canal deviation (p < 0.05). No statistical differences in shaping ability were detected between different up-and-down movements. Under laboratory conditions with JIZAI and TruNatomy, a single up-and-down movement at the working length increased the screw-in force of subsequent instruments in severely curved canals in the single-length instrumentation technique. A single up-and-down movement generated more surface defects on the file when using JIZAI. TruNatomy resulted in less stress generation during instrumentation, while JIZAI better maintained the curvature of root canals.
Sections du résumé
BACKGROUND
BACKGROUND
The screw-in effect is a tendency of a nickel-titanium (NiTi) rotary endodontic file to be pulled into the canal, which can result in a sudden increase in stress leading to instrument fracture, and over-instrumentation beyond the apex. To reduce screw-in force, repeated up-and-down movements are recommended to distribute flexural stress during instrumentation, especially in curved and constricted canals. However, there is no consensus on the optimal number of repetitions. Therefore, this study aimed to examine how repeated up-and-down movements at the working length affect torque/force generation, surface defects, and canal shaping ability of JIZAI and TruNatomy instruments.
METHODS
METHODS
An original automated root canal instrumentation device was used to prepare canals and to record torque/force changes. The mesial roots of human mandibular molars with approximately 30˚ of canal curvature were selected through geometric matching using micro-computed tomography. The samples were divided into three groups according to the number of up-and-down movements at the working length (1, 3, and 6 times; n = 24 each) and subdivided according to the instruments: JIZAI (#13/0.04 taper, #25/0.04 taper, and #35/0.04 taper) or TruNatomy (#17/0.02 taper, #26/0.04 taper, and #36/0.03 tape) (n = 12 each). The design, surface defects, phase transformation temperatures, nickel-titanium ratios, torque, force, shaping ability, and surface deformation were evaluated. Data were analyzed with the Kruskal-Wallis and Dunn's tests (α = 0.05).
RESULTS
RESULTS
The instruments had different designs and phase transformation temperatures. The 3 and 6 up-and-down movements resulted in a smaller upward force compared to 1 movement (p < 0.05). TruNatomy generated significantly less maximum torque, force, and surface wear than JIZAI (p < 0.05). However, TruNatomy exhibited a larger canal deviation (p < 0.05). No statistical differences in shaping ability were detected between different up-and-down movements.
CONCLUSIONS
CONCLUSIONS
Under laboratory conditions with JIZAI and TruNatomy, a single up-and-down movement at the working length increased the screw-in force of subsequent instruments in severely curved canals in the single-length instrumentation technique. A single up-and-down movement generated more surface defects on the file when using JIZAI. TruNatomy resulted in less stress generation during instrumentation, while JIZAI better maintained the curvature of root canals.
Identifiants
pubmed: 39180005
doi: 10.1186/s12903-024-04689-6
pii: 10.1186/s12903-024-04689-6
doi:
Substances chimiques
Titanium
D1JT611TNE
Nickel
7OV03QG267
titanium nickelide
12035-60-8
Dental Alloys
0
Types de publication
Journal Article
Langues
eng
Sous-ensembles de citation
IM
Pagination
986Subventions
Organisme : Tokyo Medical and Dental University
ID : 1B223
Organisme : Tokyo Medical and Dental University
ID : 1B223
Organisme : Tokyo Medical and Dental University
ID : 1B223
Organisme : Tokyo Medical and Dental University
ID : 1B223
Organisme : Tokyo Medical and Dental University
ID : 1B223
Organisme : Tokyo Medical and Dental University
ID : 1B223
Organisme : Tokyo Medical and Dental University
ID : 1B223
Organisme : Tokyo Medical and Dental University
ID : 1B223
Organisme : Japan Society for the Promotion of Sciences (JSPS)
ID : No. 19K18987 and No. 20K18498
Organisme : Japan Society for the Promotion of Sciences (JSPS)
ID : No. 19K18987 and No. 20K18498
Organisme : Japan Society for the Promotion of Sciences (JSPS)
ID : No. 19K18987 and No. 20K18498
Organisme : Japan Society for the Promotion of Sciences (JSPS)
ID : No. 19K18987 and No. 20K18498
Organisme : Japan Society for the Promotion of Sciences (JSPS)
ID : No. 19K18987 and No. 20K18498
Organisme : Japan Society for the Promotion of Sciences (JSPS)
ID : No. 19K18987 and No. 20K18498
Organisme : Japan Society for the Promotion of Sciences (JSPS)
ID : No. 19K18987 and No. 20K18498
Organisme : Japan Society for the Promotion of Sciences (JSPS)
ID : No. 19K18987 and No. 20K18498
Informations de copyright
© 2024. The Author(s).
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