Development of Innovative Contra-angle Handpiece Device with Piston Movement for Root Canal Preparation

Isoo Noguchi; Kazuyoshi Suzuki; Takumasa Yoshida; Yuko Yamamoto; Miyako Ono; Yasushi Yamazaki; Kazuhito Satomura; Takashi Ohyama; Noriyasu Hosoya

doi:10.1016/j.joen.2020.12.018

Development of Innovative Contra-angle Handpiece Device with Piston Movement for Root Canal Preparation

J Endod. 2021 Apr;47(4):641-647. doi: 10.1016/j.joen.2020.12.018. Epub 2021 Jan 10.

Authors

Isoo Noguchi¹, Kazuyoshi Suzuki¹, Takumasa Yoshida², Yuko Yamamoto², Miyako Ono², Yasushi Yamazaki², Kazuhito Satomura³, Takashi Ohyama⁴, Noriyasu Hosoya⁵

Affiliations

¹ Department of Endodontology, Tsurumi University School of Dental Medicine, Yokohama, Japan; Shohakukai Dental Clinic, Yokohama, Japan.
² Department of Endodontology, Tsurumi University School of Dental Medicine, Yokohama, Japan.
³ Department of Oral Medicine and Stomatology, Tsurumi University School of Dental Medicine, Yokohama, Japan.
⁴ Tsurumi University, Yokohama, Japan.
⁵ Department of Endodontology, Tsurumi University School of Dental Medicine, Yokohama, Japan. Electronic address: hosoya-n@tsurumi-u.ac.jp.

PMID: 33434564
DOI: 10.1016/j.joen.2020.12.018

Abstract

Introduction: The purpose of this study was to assess the optimal amplitude and weight of the newly developed contra-angle handpiece. The handpiece uses piston movement without using an endodontic motor and enables a safe, quick, and reliable canal preparation.

Methods: A prototype handpiece was designed. Instrumentation was performed on root canal resin blocks by 20 operators in 3 groups: the prototype handpiece with an H file (a stainless steel #25 manual H file, the piston group), a manually standardized technique with a K file (stainless steel #15-25 K files, the manual group), and a nickel-titanium (NiTi) reciprocating file with an endodontic motor (Reciproc Blue R25 [VDW, Munich, Germany], the NiTi group). Transportation of the canal center line and the time required for preparation were measured and statistically analyzed.

Results: The optimal condition was an amplitude of 1.35 mm and a weight of 61.0 g. Transportation of the canal center was observed in all groups. A statistically significant difference was found at 2.0-3.0 mm from the apical foramen between the piston or NiTi group and the manual group, but no significant difference was found between the piston and NiTi groups. The least transportation was found in the NiTi and piston groups. The handpiece with a #25 H file demonstrated a good centering ability, similar to the NiTi file, which enabled speedy preparation. The time required for preparation between the piston or NiTi group and the manual group was statistically different. No significant difference was observed between the piston and NiTi groups (P < .05).

Conclusions: We concluded that the newly designed handpiece achieved efficient canal preparation and negotiation. The handpiece could avoid endodontic accidents, including ledge formation, instrument separation, and perforation.

Keywords: Canal negotiation; H file; canal preparation; contra-angle handpiece; curved canal; vertical movement.

MeSH terms

Dental Implants*
Dental Pulp Cavity
Equipment Design
Germany
Root Canal Preparation*
Titanium
Tooth Apex

Substances

Dental Implants
Titanium