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Kyaw MS, Ebihara A, Iino Y, Thu M, Maki K, Kimura S, Htun PH, Okiji T. Effect of preset torque setting on torque/force generation, shaping ability and surface changes of nickel titanium rotary instrument in different root canal curvature locations: An ex vivo study. Dent Mater J 2024; 43:329-337. [PMID: 38583993 DOI: 10.4012/dmj.2023-244] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/09/2024]
Abstract
The aim of this study was to evaluate how preset torque settings influence the torque, vertical force, and root canal-centering ability of ProGlider and ProTaper NEXT nickel-titanium rotary instruments in canals with different curvature locations. Based on micro-computed tomography, mesial roots of human mandibular molars (25°-40° curvature) were allocated to the apical curvature (apical 1-5 mm) or the middle curvature (apical 5-9 mm) groups, and mandibular incisors (curvature <5°) to the straight canal group. Each group was subjected to automated instrumentation and torque/force measurement with the preset torque of 1, 2.5, or 5 N•cm. Canal-centering ratios were determined with micro-computed tomography. Instrument fracture occurred only in the 2.5 and 5 N•cm groups in curved canals. The preset torque setting and curvature location did not influence canal shaping ability.
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Affiliation(s)
- Moe Sandar Kyaw
- Department of Pulp Biology and Endodontics, Division of Oral Health Sciences, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University (TMDU)
- Department of Conservative Dentistry, University of Dental Medicine (Mandalay)
| | - Arata Ebihara
- Department of Pulp Biology and Endodontics, Division of Oral Health Sciences, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University (TMDU)
| | - Yoshiko Iino
- Department of Pulp Biology and Endodontics, Division of Oral Health Sciences, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University (TMDU)
| | - Myint Thu
- Department of Pulp Biology and Endodontics, Division of Oral Health Sciences, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University (TMDU)
| | - Keiichiro Maki
- Department of Pulp Biology and Endodontics, Division of Oral Health Sciences, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University (TMDU)
| | - Shunsuke Kimura
- Department of Pulp Biology and Endodontics, Division of Oral Health Sciences, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University (TMDU)
| | - Pyae Hein Htun
- Department of Pulp Biology and Endodontics, Division of Oral Health Sciences, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University (TMDU)
| | - Takashi Okiji
- Department of Pulp Biology and Endodontics, Division of Oral Health Sciences, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University (TMDU)
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Reynette C, Giess R, Davril J, Martrette JM, Mortier É, Balthazard R, Vincent M. Influence of endodontic motors on the behaviour of root canal shaping instruments: an in vitro comparative study. BDJ Open 2023; 9:51. [PMID: 38030624 PMCID: PMC10687023 DOI: 10.1038/s41405-023-00179-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2023] [Revised: 10/30/2023] [Accepted: 10/30/2023] [Indexed: 12/01/2023] Open
Abstract
AIMS The endodontic literature reports a lot of comparative study on endodontic instruments, concerning as well their geometry, instrumental dynamics, material, mechanical behavior or heat treatment. However, to our knowledge, no study has focused on the influence of endodontic motors on the shaping abilities of endodontic instruments. Thus, the aim of this study was to analyze the influence of the endodontic motors on root canal shaping instruments. METHOD Dual Move (MICRO-MEGA, Besançon, France), Canal Pro CL2i (COLTENE, Alstätten, Suisse), Canal Pro Jeni Motor (COLTENE, Alstätten, Suisse), Ai Motor (WOODPECKER, Guilin, China), Wave One motor (VDW, Postfach, Munich) and Smart A (WOODPECKER, Guilin, China) were pre-clinically compared in continuous rotation and reciprocating motion on a traction/compression bench using resin blocks. Canal shaping in continuous rotation and reciprocating motion were performed with One Curve and One RECI instruments (MICRO-MEGA, Besançon, France), respectively. The penetration/removal forces, making it possible to objectify the cutting effect and screwing effect of the instruments during root canal shaping, were analyzed. RESULTS The results showed (i) that endodontic motors influence the mechanical behavior of endodontic instruments, (ii) that the influence of the motors is essentially felt during reciprocating motion and (iii) that the reciprocating angles influence the mechanical behavior of endodontic instruments. CONCLUSION Only endodontic instruments are widely studied in literature while endodontic motors have a direct influence on root canal treatment. This study analyzes the influence of the endodontic motors on root canal shaping instruments. This study tends to demonstrate that Jeni Motor could optimize the mechanical behavior of endodontic instruments.
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Affiliation(s)
| | - Renaud Giess
- Départment de Dentisterie Restauratrice et Endodontie, Faculté d'odontologie de Lorraine, Université de Lorraine, Nancy, France
- CNRS, IJL, Université de Lorraine, Nancy, France
| | - Jeanne Davril
- Départment de Dentisterie Restauratrice et Endodontie, Faculté d'odontologie de Lorraine, Université de Lorraine, Nancy, France
| | - Jean-Marc Martrette
- Départment de Dentisterie Restauratrice et Endodontie, Faculté d'odontologie de Lorraine, Université de Lorraine, Nancy, France
- Université de Lorraine, Faculté de Médecine, EA 3450, Développement, Adaptation et Handicap, Nancy, France
| | - Éric Mortier
- Départment de Dentisterie Restauratrice et Endodontie, Faculté d'odontologie de Lorraine, Université de Lorraine, Nancy, France
- CNRS, IJL, Université de Lorraine, Nancy, France
| | - Rémy Balthazard
- Départment de Dentisterie Restauratrice et Endodontie, Faculté d'odontologie de Lorraine, Université de Lorraine, Nancy, France
- CNRS, IJL, Université de Lorraine, Nancy, France
| | - Marin Vincent
- Départment de Dentisterie Restauratrice et Endodontie, Faculté d'odontologie de Lorraine, Université de Lorraine, Nancy, France.
- CNRS, LEM3, Université de Lorraine, Metz, France.
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Al Omari TMN, La Rosa GRM, Albanna RHI, Tabnjh A, Papale F, Pedullà E. The effect of different kinematics on apical debris extrusion with a single-file system. Odontology 2023; 111:910-915. [PMID: 36917401 PMCID: PMC10492679 DOI: 10.1007/s10266-023-00802-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2022] [Accepted: 02/27/2023] [Indexed: 03/16/2023]
Abstract
To compare the amount of extruded debris caused by different motions using a single-file system. Fifty mandibular first molar teeth were randomized into 5 groups (n = 10) according to the motion tested: Optimize Torque Reverse (OTR), TF Adaptive Motion (TFA), continuous rotation (CR), reciprocation motion (+ 150°, -30°) (REC), and Jeni motion (Jeni). One Curve single file 25/06 (Micro-Mega, Besançon, France) was used in all experimental groups. The root canals were irrigated with 2.5% NaOCl, and the extruded debris were collected at pre-weighted glass vials. The glass vials were kept inside an incubator for one week at 70 °C to dry out the irrigating solution. The extruded debris was quantified by subtracting the pre-instrumentation from the post-instrumentation weight of the glass vials. The time required for each instrumentation procedure was digitally recorded. All data were analyzed statistically with one way ANOVA and post hoc Tukey test (P < 0.05). All the motions extruded apically debris with Jeni mode caused significantly less debris extrusion than TFA, REC, and CR (P < 0.05) while no significant difference emerged with OTR. Preparation time was not significantly different in all groups. Within the limits of the present study, all the kinematics produced apically debris extrusion, with Jeni reporting a similar amount of debris compared with OTR and significantly less than TFA, REC, and CR. Preparation time was similar among the tested kinematics.
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Affiliation(s)
- Taher M N Al Omari
- Department of Conservative Dentistry, Faculty of Dentistry, Jordan University of Science and Technology, Irbid, Jordan
| | - Giusy Rita Maria La Rosa
- Department of General Surgery and Medical-Surgical Specialties, University of Catania, Catania, Italy.
| | - Rami Haitham Issa Albanna
- Department of Conservative Dentistry, Faculty of Dentistry, Jordan University of Science and Technology, Irbid, Jordan
| | - Abedelmalek Tabnjh
- Department of Applied Dental Science, Faculty of Applied Medical Science, Jordan University of Science and Technology, Irbid, Jordan
| | - Flavia Papale
- Department of General Surgery and Medical-Surgical Specialties, University of Catania, Catania, Italy
| | - Eugenio Pedullà
- Department of General Surgery and Medical-Surgical Specialties, University of Catania, Catania, Italy
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Orhan EO, Bahadır D, Irmak O. Kinematics of 'Adaptive Motion' under constant torque values. J Endod 2022; 48:355-361. [PMID: 34999094 DOI: 10.1016/j.joen.2021.12.009] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2021] [Revised: 12/24/2021] [Accepted: 12/31/2021] [Indexed: 11/30/2022]
Abstract
INTRODUCTION To demonstrate the unknown kinematics of complex adaptive motion with respect to disclosed values, the aim of the present study was (i)to analyze the adaptive motion and (ii)to compare the effects of constant torque values on kinematics. METHODS A new endodontic motor(Aseptico AEU-28SYB Elements) and 8:1 contra-angle handpiece were used for analysis. A pilot test was conducted for synchronizing the external experimental stress on the shaft of the target object and the inbuilt torque sensor of the motor source. A load setup was developed by attaching universal precision weights to the shaft of the of the target object. The groups were adaptive motion with no load(TFA-0), adaptive motion with 100 gcm(TFA-100), and 200 gcm(TFA-200) constant load. The peak-to-peak based phase identification method was used to analyze the kinematics. Student's t and Mann Whitney U tests were used where applicable(α=0.05). RESULTS A noteworthy observation was the inconsistent kinematics of the TFA-100 compared to the kinematics of TFA-0 and TFA-200. TFA-100 presented mixed-phased kinematics, which consisted of both quaternary(n=33) phases similar to that of TFA-200, and dual(n=17) phases similar to that of TFA-0. The sequence of these quaternary and dual phases of TFA-100 was arbitrarily changing. The kinematic parameters of dual-phase intermittent motion of TFA-0 and TFA-100 and quaternary-phase reciprocating motion of TFA-100 and TFA-200 revealed significant differences(p<0.05). CONCLUSIONS The main conclusions of the present study are the kinematics of adaptive motion was demonstrated and the 100 gcm load is not sufficient for predictable and constant operation in reciprocating mode.
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Affiliation(s)
- Ekim Onur Orhan
- Translational Medicine Research and Clinical Center, Eskisehir Osmangazi University, TR26040, Eskisehir, Turkey; Computer-Aided Diagnosis and Treatment Application and Research Center in Healthcare, Eskisehir Osmangazi University, 26040 Eskisehir, Turkey; Department of Endodontics, Faculty of Dentistry, Eskişehir Osmangazi University, TR26040 Eskişehir, Turkey.
| | - Duygu Bahadır
- Department of Endodontics, Faculty of Dentistry, Eskişehir Osmangazi University, TR26040 Eskişehir, Turkey
| | - Ozgur Irmak
- Department of Restorative Dentistry, Faculty of Dentistry, Near East University, Nicosia / TRNC Mersin 10, Turkey
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