Poster Presentation

Poster Presentation

PR107 - Separation Incidence of Nickel-Titanium Rotary Instruments in Clinical Use

Thursday, April 26
10:00 AM - 1:00 PM
Room: Exhibit Hall

Objective: The aim of this study was to investigate the separation incidence and reasons of discarding of nickel-titanium (NiTi) rotary instruments in clinical use. Methods: All discarded NiTi rotary instruments were collected from the endodontic clinic at Showa University Dental Hospital over three years. After inspection under stereomicroscopy, the discarded instruments were classified into three categories: (i) no deformation after eight usages; (ii) plastic deformation; and (iii) file separation. The number of clinical usages at the time of file separation or plastic deformation was also recorded. The difference in the number of usage before discarding the instrument with plastic deformation and file separation was statistically analyzed using Kaplan-Meier survival analysis and Log rank test (α=0.05). Results: A total of 646 NiTi rotary instruments were discarded. The overall incidence of separation was 4.0%. The size 35, 0.06 taper demonstrated the most frequent separations in 17 out of 26 instruments. Separations were recorded even during the first clinical use, whereas above five usages accounted for over half of the incidence of instrument separation. The mean clinical usages (number of usage ± standard deviation) at the time of discarding the instruments in the file separation and plastic deformation categories were 4.3 ± 2.2 and 3.8 ±12.4 respectively, with no significant difference (p>0.05). Conclusion: While using the NiTi rotary instruments, the clinicians should be aware of the size and the duration of usage that render the instrument susceptible to separation.

Yoshio Yahata

Assistant professor

Yoshio Yahata, D. D. S., Ph. D., received his Doctor of Dental Surgery degree from Iwate Medical University in 2005 and his Ph. D. Degree from Tokyo Medical and Dental University in 2009. My main research project is “engineering analysis of nickel-titanium endodontic instruments”.
I currently serve as an assistant professor, Division of Endodontology, Department of Conservative Dentistry, Showa University School of Dentistry.
I was a visiting assistant professor, Department of Endodontics, West virginia University from 2014 to 2016.

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Takuma Tobe

DDS,Graduate student in PhD course

Takuma Tobe, D.D.S, is Ph. D. candidate in Showa University. I received my Doctor of Dental Surgery degree from Showa University in 2014.My main research project is "biomechanical analysis of dentin related to Aging processes".

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Chiaki Ota

PhD Student with no professional degree

Chiaki Ota, D.D.S, is Ph. D. candidate in Showa University. I received my Doctor of Dental Surgery degree from Showa University in 2013. My main research project is "biomolecular and functional analysis of non-coding RNA in bacteria".

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Shintaro Uraba

Assistant professor

Shintaro Uraba DDS, PhD, received his Doctor of Dental Surgery degree from Tokyo Medical and Dental University and received his PhD degree from Tokyo Medical and Dental University. He currently serves an assistant professor, Division of Endodontology, Department of Conservative Dentistry, Showa University School of Dentistry.

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Masayuki Takabayashi

Assistant professor

Masayuki Takabayashi DDS, received his Doctor of Dental Surgery degree from Showa University. He currently serves an assistant professor, Division of Endodontology, Department of Conservative Dentistry, Showa University School of Dentistry.

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Hitoshi Sakaue

Private practice

Hitoshi Sakaue DDS, PhD, received his Doctor of Dental Surgery degree from Tokyo Medical and Dental University and received his PhD degree from Tokyo Medical and Dental University. He currently own his dental office specialty in endodontics in Tokyo.

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Noriyuki Suzuki

Associate professor

Noriyuki Suzuki, D.D.S, Ph. D. He received his Doctor of Dental Surgery degree from Tokyo Medical and Dental University and his Ph.D degree from Tokyo Medical and Dental University. He is currently serve as an accosiate professor, Department of Conservative Dentistry, Division of Endodontology in Showa University School of Dentistry.

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