1
|
Belladonna FG, Guimarães TDM, Silva EJNL, Vieira EDO, Lee JK, Rodrigues EDA, Souza EM, Versiani MA. Exploring the Efficacy of 6 Preparation Systems for Achieving Minimal Root Canal Transportation: A Micro-CT Investigation. J Endod 2023; 49:1722-1732. [PMID: 37717910 DOI: 10.1016/j.joen.2023.09.004] [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] [Received: 05/31/2023] [Revised: 08/02/2023] [Accepted: 09/07/2023] [Indexed: 09/19/2023]
Abstract
INTRODUCTION This study aimed to assess the canal transportation with 6 preparation systems. METHODS Sixty curved mesial roots of mandibular molars were scanned, and their root canals (n = 20 per group) were prepared with XP-endo Shaper, BioRace, ProTaper Next, Twisted File Adaptive, Reciproc, or Reciproc Blue systems. After preparation, a new scan was conducted, and transportation was determined by comparing the geometric center of the canal in 13,542 cross-sectional slices. The transport direction frequencies were recorded, and linear transport were compared using a Univariate GLM model and Tukey honestly significant difference tests (α = 5 %). RESULTS Transportation was affected by the preparation system and root third (P < .05), with no significant effect observed for the root canal (P > .05). The Twisted File Adaptive had the highest transport (P < .05), and the lowest transports were observed with XP-endo Shaper, ProTaper Next, and BioRace (P < .05). Reciproc Blue and Reciproc showed intermediate results (P < .05). The apical and coronal third exhibited the lowest and highest transportation, respectively (P < .05). A significant interaction was observed between the preparation system and root third (P < .05). In the coronal third, transportation was mostly toward the disto-inside direction, whereas in the middle and apical thirds, transportation was predominantly toward the mesio-outside direction. CONCLUSIONS XP-endo Shaper had the lowest mean linear transportation followed by the ProTaper Next, BioRace, Reciproc Blue, and Reciproc systems. The Twisted File Adaptive system had the worst performance. The direction of transportation was generally toward the inner aspect of the canal at the coronal third and toward the outer aspect of the curve at the middle and apical thirds.
Collapse
Affiliation(s)
| | | | - Emmanuel João Nogueira Leal Silva
- Department of Endodontics, Fluminense Federal University, Rio de Janeiro, Brazil; Department of Endodontics, Grande Rio University (UNIGRANRIO), Rio de Janeiro, Brazil
| | | | - Jong-Ki Lee
- Private Practice, Changwon, Republic of Korea
| | | | - Erick Miranda Souza
- Department of Dentistry II, Federal University of Maranhão, São Luís, Maranhão
| | | |
Collapse
|
2
|
Cyclic Fatigue Resistance of Nickel–Titanium Rotary Instruments after Simulated Clinical Use. Appl Bionics Biomech 2022; 2022:1716008. [PMID: 36267671 PMCID: PMC9578904 DOI: 10.1155/2022/1716008] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2022] [Accepted: 09/23/2022] [Indexed: 11/17/2022] Open
Abstract
Objective Cyclic fatigue occurred in the curved canal when the instrument freely rotated leading to repeated compressive and tensile stresses. This study aims to evaluate the cyclic fatigue resistance (CFR) of new and used 2Shape and AF F-One rotary instrument systems by using an artificial stainless-steel canal. Methods A total of 80 rotary nickel–titanium (NiTi) instruments of two systems were used, 2Shape/TS2 and AF F-ONE/F5 (40 in each group). The instruments were subdivided into group A 20 instruments (10 per system) that remain unused, group B 20 instruments (10 per system) instrumented 20 root canals (each file prepared 1 canal for 2 minutes), group C 20 instruments (10 per system) instrumented 40 canals each for 2 minutes (each file prepared 2 canals), group D of 20 instruments (10 per system) prepared 60 canals each for 2 minutes (each file prepared 3 canals). After each canal instrumentation, the instruments were cleaned and sterilized by autoclave. Then, all the instruments underwent cyclic fatigue testing in an artificial stainless steel canal with a 50° canal curvature and a radius of curvature of 5 mm. The time and number of cycles to failure (NCF) were recorded. Data were analyzed using the Welch ANOVA test for intragroup comparison and the pairwise test for multiple comparisons. Results The unused instruments of the AF F-One rotary system showed statistically higher CFR than clinically used instruments (P < 0.05). 2Shape system was not affected by clinical use (P > 0.05). The mean NCF of AF F-One instruments was significantly higher than the equivalent file group of 2Shape instruments (P < 0.05). Conclusion A reduction in the CFR for AF F-One instruments after use was observed when compared to the new unused file group. The 2Shape system was not affected by clinical use. AF F-One performed better in terms of NCF.
Collapse
|
3
|
Vivan RR, Costa VASM, Conti LC, Duque JA, Bramante CM, Só MVR, Alcalde MP, Duarte MAH. Effect of nickel-titanium alloys on root canal preparation and on mechanical properties of rotary instruments. Braz Oral Res 2022; 36:e085. [PMID: 35703710 DOI: 10.1590/1807-3107bor-2022.vol36.0085] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2020] [Accepted: 02/24/2022] [Indexed: 11/21/2022] Open
Abstract
The aim of this study was to evaluate the quality of curved root canal preparation, torsional fatigue, and cyclic fatigue of rotary systems manufactured with different NiTi alloys. Ninety single-rooted canals with curvatures of 15° to 30o were scanned and divided into three groups according to the rotary system used: BT-Race (BTR) - 10.06, 35.00, 35.04; SequenceRotaryFile (SRF) - 15.04, 25.06, 35.04; and ProDesignLogic (PDL) - 25.01, 25.06, 35.05. Each system was used on three specimens. The teeth were prepared, scanned, and analyzed to assess increase in volume, transportation, and centering ability of the root canal. Torsional fatigue of glide path instruments (BTR 10.06, SRF 15.04 and PDL 25.01) and cyclic fatigue of the finishing instrument (BTR 35.04, SRF 35.04 and PDL 35.05) were obtained by analyzing completely new instruments (n = 10) and instruments after they had been used three times (n = 10). After the torsional and cyclic fatigue tests, the fractured surface of the new and used instruments were examined by scanning electron microscopy. Increase in volume, canal transportation, and centering ability showed no significant differences among the groups (p > 0.05). The torsional test showed that SRF 15.04 produced the highest torque values for both new and used instruments, followed by PDL 25.01 and BTR 10.06 (p < 0.05). PDL 25.01, both new and used, exhibited higher values of angular deflection followed by SRF 15.04 and BTR 10.06 (p < 0.05). As regards cyclic fatigue, use of PDL 35.05, both new and used, required a longer time and larger number of cycles than did SRF 35.04 and BTR 35.04 (p < 0.05). Clinical use affected the torsional fatigue of BTR; however, cyclic fatigue was not significantly affected (p < 0.05). All rotary systems were able to prepare the curved canals satisfactorily and were used safely on the three specimens. Relative to torsional fatigue, SRF 15.04 exhibited a higher torque, and PDL 25.01, higher angular deflection. BTR 10.06 was the most affected by clinical use. PDL 35.05 showed greater resistance to cyclic fatigue.
Collapse
Affiliation(s)
- Rodrigo Ricci Vivan
- Universidade de São Paulo - USP, Bauru School of Dentistry , Department of Dentistry, Endodontics, and Dental Materials , Bauru , SP , Brazil
| | - Vanessa Abreu Sanches Marques Costa
- Universidade de São Paulo - USP, Bauru School of Dentistry , Department of Dentistry, Endodontics, and Dental Materials , Bauru , SP , Brazil
| | - Leticia Citelli Conti
- Universidade de São Paulo - USP, Bauru School of Dentistry , Department of Dentistry, Endodontics, and Dental Materials , Bauru , SP , Brazil
| | - Jussaro Alves Duque
- Universidade de São Paulo - USP, Bauru School of Dentistry , Department of Dentistry, Endodontics, and Dental Materials , Bauru , SP , Brazil
| | - Clovis Monteiro Bramante
- Universidade de São Paulo - USP, Bauru School of Dentistry , Department of Dentistry, Endodontics, and Dental Materials , Bauru , SP , Brazil
| | - Marcus Vinicius Reis Só
- Universidade Federal do Rio Grande do Sul - UFRS, Department of Endodontics , Porto Alegre , RS , Brazil
| | - Murilo Priori Alcalde
- Universidade de São Paulo - USP, Bauru School of Dentistry , Department of Dentistry, Endodontics, and Dental Materials , Bauru , SP , Brazil
| | - Marco Antonio Hungaro Duarte
- Universidade de São Paulo - USP, Bauru School of Dentistry , Department of Dentistry, Endodontics, and Dental Materials , Bauru , SP , Brazil
| |
Collapse
|
4
|
Arias A, Peters OA. Present Status and Future Directions - Canal Shaping. Int Endod J 2022; 55 Suppl 3:637-655. [PMID: 35118683 PMCID: PMC9303733 DOI: 10.1111/iej.13698] [Citation(s) in RCA: 19] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/24/2021] [Revised: 01/30/2022] [Accepted: 02/01/2022] [Indexed: 12/01/2022]
Abstract
This narrative review will focus on the evolution, present and future of engine‐driven root canal preparation. Root canal preparation changed drastically when Walia in 1988 introduced the use of nickel‐titanium (NiTi) alloys in Endodontics. In 2013, five generations of NiTi endodontic instruments had been established based on their metallurgical, mechanical properties and design features. Since then, manufacturers have been introducing further major changes in instrument design and characteristics that have not been translated in new recognized generations of instruments. In general, those changes have demonstrated enhanced instrument properties, but it is not clear yet if all those improvements are directly translated to an improvement in clinical success. This narrative review attempts to address the present status of engine‐driven instruments in terms of both evidence from laboratory‐based studies and clinical data, to identify potential further generations of instruments, and last to anticipate future directions for research and development.
Collapse
Affiliation(s)
- A Arias
- School of Dentistry, Complutense University, Madrid, Spain
| | - O A Peters
- School of Dentistry, The University of Queensland, Herston, QLD, Australia
| |
Collapse
|
5
|
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.
Collapse
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
| |
Collapse
|
6
|
Pereira RP, Alcalde MP, Duarte MAH, Vivan RR, Bueno CES, Duque JA, Calefi PHS, Bramante CM. A laboratory study of the scouting ability of two reciprocating glide path instruments in mesial root canals of extracted mandibular molars. Int Endod J 2021; 54:1166-1174. [PMID: 33556198 DOI: 10.1111/iej.13492] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2020] [Accepted: 02/05/2021] [Indexed: 11/27/2022]
Abstract
AIM To evaluate in a laboratory setting the performance of two reciprocating glide path systems, WaveOne Gold Glider (WO) and R-Pilot (RP), to create a glide path in mesial root canals of mandibular molars and to assess the torsional resistance of instruments after performing the glide path. METHODOLOGY A total of 60 mesial root canals of extracted human mandibular molars were divided into two groups (n = 30) according to the glide path system to be used. The data from the volume of each canal, acquired by microcomputed tomography (micro-CT), were validated statistically for the anatomical pairing of the groups. Preparation time, frequency in gaining apical patency, plastic deformation rate of instruments, and canal transportation and centring ability were recorded and compared statistically. The torsional fatigue of the instruments after use was also evaluated. Data were analysed using Fisher's exact test and Mann-Whitney U-test with a 5% significance level. RESULTS No significant differences were found between groups regarding the time required to perform the glide path, the frequency distributions of the canals classified as patent and the instruments with plastic deformation after use (P > 0.05). No significant differences were found between groups regarding the degree of canal transportation and centring ability at the cervical, middle and apical thirds (P > 0.05). The RP groups had significantly greater maximum torsional strength values compared with the WO groups (P < 0.05). The used WO group had greater angular deflection to fracture when compared to the new WO group (P < 0.05). A significant difference was also found in the percentage of loss of angular deflection in a comparison of the WO group with the RP group (P < 0.05). CONCLUSIONS The WO and RP instruments performed the same in terms of preparation time, plastic deformation, gaining apical patency, degree of canal transportation and centring ability. The RP instruments had greater torsional strength, less angular deflection and lower percentage of loss in angular deflection than the WO. The used WO group had the greatest angular deflection values.
Collapse
Affiliation(s)
- R P Pereira
- Department of Operative Dentistry, Endodontics and Dental Materials, Bauru School of Dentistry, University of São Paulo, Bauru, Brazil
| | - M P Alcalde
- Department of Operative Dentistry, Endodontics and Dental Materials, Bauru School of Dentistry, University of São Paulo, Bauru, Brazil
| | - M A H Duarte
- Department of Operative Dentistry, Endodontics and Dental Materials, Bauru School of Dentistry, University of São Paulo, Bauru, Brazil
| | - R R Vivan
- Department of Operative Dentistry, Endodontics and Dental Materials, Bauru School of Dentistry, University of São Paulo, Bauru, Brazil
| | - C E S Bueno
- Department of Endodontics, São Leopoldo Mandic Dental Research Center, Campinas, Brazil
| | - J A Duque
- Department of Operative Dentistry, Endodontics and Dental Materials, Bauru School of Dentistry, University of São Paulo, Bauru, Brazil
| | - P H S Calefi
- Department of Operative Dentistry, Endodontics and Dental Materials, Bauru School of Dentistry, University of São Paulo, Bauru, Brazil
| | - C M Bramante
- Department of Operative Dentistry, Endodontics and Dental Materials, Bauru School of Dentistry, University of São Paulo, Bauru, Brazil
| |
Collapse
|
7
|
de Camargo EJ, Duarte MAH, Alcalde MP, Só MVDR, Vasconcelos BCD, Silva EJNL, Plotino G, Vivan RR. Safety of large preparation with different instruments in the buccal canals of maxillary molars. AUST ENDOD J 2020; 47:81-89. [PMID: 33368843 DOI: 10.1111/aej.12481] [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: 09/03/2020] [Revised: 12/02/2020] [Accepted: 12/08/2020] [Indexed: 11/26/2022]
Abstract
This study aimed to evaluate the influence of large apical preparations with Reciproc (REC), Hyflex CM (HCM) and Twisted File Adaptive (TFA) systems using micro-computed tomography (MCT). Ninety mesiobuccal (MB) and distobuccal (DB) root canals of maxillary molars (n = 45) were scanned using MCT before and after the shaping procedures. The root canals (n = 15) were prepared until REC 40.06, HCM 40.04 and TFA 35.04. The root canal transportation (RCT), centring ability (CA), change in volume of the root canal and at different levels (VC), remaining dentine thickness (RDT), removal of dentine wall (RDW) and working time (WT) were evaluated. Data were analysed using the Kruskal-Wallis and Dunn tests, and the one-way ANOVA and Tukey tests with a level of significance set at 5%. No significant difference among the instruments was found regarding the RCT, CA, RDT, RDW and WT (P > 0.05), in larger apical preparations in curved MB and straight DB canals of maxillary molars.
Collapse
Affiliation(s)
- Ericson Janolio de Camargo
- Division of Endodontics, College of Dentistry, University Center of Várzea Grande (UNIVAG), Várzea Grande, Brazil.,Department of Operative Dentistry, Endodontics and Dental Materials, Bauru School of Dentistry, University of São Paulo, Bauru, Brazil
| | - Marco Antonio Hungaro Duarte
- Department of Operative Dentistry, Endodontics and Dental Materials, Bauru School of Dentistry, University of São Paulo, Bauru, Brazil
| | - Murilo Priori Alcalde
- Department of Operative Dentistry, Endodontics and Dental Materials, Bauru School of Dentistry, University of São Paulo, Bauru, Brazil
| | | | | | | | - Gianluca Plotino
- Department of Endodontics, Sapienza Università di Roma, Rome, Italy
| | - Rodrigo Ricci Vivan
- Department of Operative Dentistry, Endodontics and Dental Materials, Bauru School of Dentistry, University of São Paulo, Bauru, Brazil
| |
Collapse
|
8
|
Abstract
OBJECTIVE The aim of this study was to evaluate the cyclic fatigue, torsional behavior and bending resistance of EdgeTaper Platinum [ETP (tip 25, taper 0.06)], Flex Gold [FG (tip 25, taper 0.08)], Pro-T [PT (tip 25, taper 0.08)] and ProTaper Gold [PTG (tip 25, taper 0.08)] systems. METHODS Rotary instruments of ETP, PT, FG, and PTG were used (n=30). Cyclic fatigue tests were performed using an artificial stainless-steel canal with a 60o angle and a 5-mm radius of curvature at body temperature (35°±1°C). The time and number of cycles to fracture (NCF) was recorded. The torsional test evaluated the torque and angle of rotation to failure at 3 mm from the tip according to ISO 3630-1. The fractured surface of each fragment was observed by using scanning electron microscopy (SEM). The bending test evaluated the torque required to bend the instruments at an angular deflection of 60°. Data were analyzed using one-way ANOVA and Tukey tests, and the level of significance was set at 5%. RESULTS The ETP had highest time until fracture and NCF than all the groups (P<0.05). The PTG had the highest torsional strength, followed by FG (P<0.05). The ETP had the highest angular rotation, followed by PT and PTG (P<0.05). The FG showed the highest bending resistance, followed by the PTG (P<0.05). CONCLUSION In conclusion, the ETP and PT exhibited higher cyclic fatigue resistance, higher angular deflection values and lower bending force than FG and PTG. The PTG instruments showed the highest torsional strength and the lowest cyclic fatigue resistance.
Collapse
|
9
|
Weissheimer T, Heck L, Calefi PHS, Alcalde MP, Rosa RA, Vivan RR, Duarte MAH, Só MVR. Evaluation of the mechanical properties of different nickel–titanium retreatment instruments. AUST ENDOD J 2020; 47:265-272. [DOI: 10.1111/aej.12474] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2020] [Revised: 10/27/2020] [Accepted: 11/21/2020] [Indexed: 11/27/2022]
Affiliation(s)
- Theodoro Weissheimer
- Department of Conservative Dentistry Federal University of Rio Grande do Sul Porto Alegre Brazil
| | - Luana Heck
- Department of Conservative Dentistry Federal University of Rio Grande do Sul Porto Alegre Brazil
| | - Pedro Henrique Souza Calefi
- Department of Operative Dentistry Endodontics and Dental Materials Bauru School of Dentistry University of São Paulo São Paulo Brazil
| | | | - Ricardo Abreu Rosa
- Department of Conservative Dentistry Federal University of Rio Grande do Sul Porto Alegre Brazil
| | - Rodrigo Ricci Vivan
- Department of Operative Dentistry Endodontics and Dental Materials Bauru School of Dentistry University of São Paulo São Paulo Brazil
| | - Marco Antonio Hungaro Duarte
- Department of Operative Dentistry Endodontics and Dental Materials Bauru School of Dentistry University of São Paulo São Paulo Brazil
| | - Marcus Vinícius Reis Só
- Department of Conservative Dentistry Federal University of Rio Grande do Sul Porto Alegre Brazil
| |
Collapse
|
10
|
Duque JA, Bramante CM, Duarte MAH, Alcalde MP, Silva EJNL, Vivan RR. Cyclic Fatigue Resistance of Nickel-Titanium Reciprocating Instruments after Simulated Clinical Use. J Endod 2020; 46:1771-1775. [PMID: 32818567 DOI: 10.1016/j.joen.2020.08.010] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2019] [Revised: 07/23/2020] [Accepted: 08/10/2020] [Indexed: 12/11/2022]
Abstract
INTRODUCTION The aim of this study was to evaluate the cyclic fatigue resistance of different heat-treated nickel-titanium reciprocating instruments in 2 different situations: new and used instruments after preparing 3 curved canals. METHODS A total sample of 60 nickel-titanium instruments of 3 systems (n = 20 per system) were used in this study: ProDesign R (tip 25, 0.06 taper; Easy Dental Equipment, Belo Horizonte, Brazil), Reciproc Blue (tip 25, 0.08v taper; VDW, Munich, Germany), and WaveOne Gold (tip 25, 0.07v taper; Dentsply Sirona, Ballaigues, Switzerland). Thirty new instruments (n = 10 per system) were used to prepare 90 curved single-rooted mandibular premolars (n = 30). Each instrument was used to prepare 3 root canals, and after each canal preparation the instrument was ultrasonic cleaned and submitted to autoclave sterilization procedures. The other 30 instruments (n = 10 per system) were kept without use. Then, the new and used instruments were subjected to the cyclic fatigue test in an artificial canal with a 30° angle and a 5-mm radius of curvature. The time and number of cycles to fatigue were recorded. Data were analyzed using the unpaired t test for intragroup comparison. For intergroup comparison, analysis of variance and the Tukey test for multiple comparisons were used. RESULTS The intergroup comparison of new instruments showed that ProDesign R had the highest cyclic fatigue resistance followed by Reciproc Blue and WaveOne Gold (P < .05). Regarding the used instruments, WaveOne Gold had the lowest cyclic fatigue resistance (P < .05). The intragroup comparison between new and used instruments showed that WaveOne Gold and ProDesign R presented a significant reduction in the cyclic fatigue resistance after simulated clinical use (P < .05); no difference was found with the Reciproc Blue instruments (P > .05). CONCLUSIONS ProDesign R had the highest cyclic fatigue resistance, whereas WaveOne Gold had the lowest for new and used instruments. Simulated clinical use affected the cyclic fatigue resistance of ProDesign R and WaveOne Gold but not of Reciproc Blue instruments.
Collapse
Affiliation(s)
- Jussaro Alves Duque
- Department of Endodontics, Ourinhos Integrated School, Ourinhos, São Paulo, Brazil; Department of Dentistry, Endodontics, and Dental Materials, School of Dentistry of Bauru, University of São Paulo, São Paulo, São Paulo, Brazil.
| | - Clovis Monteiro Bramante
- Department of Dentistry, Endodontics, and Dental Materials, School of Dentistry of Bauru, University of São Paulo, São Paulo, São Paulo, Brazil
| | - Marco Antonio Hungaro Duarte
- Department of Dentistry, Endodontics, and Dental Materials, School of Dentistry of Bauru, University of São Paulo, São Paulo, São Paulo, Brazil
| | - Murilo Priori Alcalde
- Department of Dentistry, Endodontics, and Dental Materials, School of Dentistry of Bauru, University of São Paulo, São Paulo, São Paulo, Brazil
| | | | - Rodrigo Ricci Vivan
- Department of Dentistry, Endodontics, and Dental Materials, School of Dentistry of Bauru, University of São Paulo, São Paulo, São Paulo, Brazil
| |
Collapse
|
11
|
Ramyadharshini T, Anand Sherwood I, Vigneshwar VS, Ernest Prince P, Vaanjay M. Influence of glide path size and operating kinetics on time to reach working length and fracture resistance of Twisted File adaptive and Endostar E3 nickel-titanium file systems. Restor Dent Endod 2020; 45:e22. [PMID: 32483539 PMCID: PMC7239674 DOI: 10.5395/rde.2020.45.e22] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2019] [Revised: 10/25/2019] [Accepted: 11/21/2019] [Indexed: 11/11/2022] Open
Abstract
Objectives This study investigated the influence of glide path size and operating kinetics on the time to reach the working length and the fracture resistance of Twisted File (TF) and Endostar E3 files. Materials and Methods A total of 120 mandibular single-rooted premolars were selected. Two methods of kinetic motion (TF adaptive and continuous rotary motion) and file systems (TF and Endostar E3) were employed. The files were used in root canals prepared to apical glide path sizes of 15, 20, and 25. The time taken to reach the working length and the number of canals used before the instrument deformed or fractured were noted. Fractured instruments were examined with scanning electron microscopy. Results The TF system took significantly more time to reach the working length than the Endostar E3 system. Both systems required significantly more time to reach the working length at the size 15 glide path than at sizes 20 and 25. A greater number of TFs than Endostar E3 files exhibited deformation, and a higher incidence of instrument deformation was observed in adaptive than in continuous rotary motion; more deformation was also observed with the size 15 glide path. One TF was fractured while undergoing adaptive motion. Conclusions No significant difference was observed between continuous rotary and adaptive motion. The TF system and adaptive motion were associated with a higher incidence of deformation and fracture. Apical glide path sizes of 20 and 25 required significantly less time to reach the working length than size 15.
Collapse
Affiliation(s)
| | - Inbaraj Anand Sherwood
- Department of Conservative Dentistry and Endodontics, CSI College of Dental Sciences, Madurai, TN, India
| | - V Shanmugham Vigneshwar
- Department of Conservative Dentistry and Endodontics, CSI College of Dental Sciences, Madurai, TN, India
| | - Prakasam Ernest Prince
- Department of Conservative Dentistry and Endodontics, CSI College of Dental Sciences, Madurai, TN, India
| | - Murugadoss Vaanjay
- Department of Conservative Dentistry and Endodontics, CSI College of Dental Sciences, Madurai, TN, India
| |
Collapse
|
12
|
Flexural Fatigue of Unicone, Navigator Evo and Protaper Next Files in Reciprocate and Continuous Rotary Systems in Simulated Curved Canals—An In Vitro Study. METALS 2019. [DOI: 10.3390/met10010023] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
This study investigated the cyclic fatigue resistance of three brands of nickel-titanium rotary files—Unicone (size 25 0.06; Medin), Navigator Evo (W-4; size 25 0.06; Medin) and Protaper Next (X2; size 25 0.06 Dentsply Tulsa Dental)—in reciprocating and continuous motion, during artificial canal instrumentation. Seventy-two samples—Unicone (n = 24), Navigator Evo (n = 24), and Protaper Next (n = 24)—each measuring 25 mm in length, were allocated to reciprocating (n = 36) and continuous motion (n = 36) experimental subgroups, and rotated in a simulated steel curved canal until fracture occurred. Fracture times and fragment lengths of samples in the experimental subgroups were recorded. One of the Unicone, Navigator Evo and Protaper Next fractured samples was randomly selected and analyzed for topographic characteristics by using scanning electron microscopy. Times to fracture and fragment lengths of samples were evaluated by analysis of variance and Tukey’s tests. Independent sample t test was used to compare mean values between the different groups. Protaper Next samples displayed significantly higher resistance to cyclic fatigue in reciprocating motion than Unicone and Navigator Evo samples (p < 0.001). Unicone samples exhibited the least fracture-resistant in continuous and reciprocating motion.
Collapse
|
13
|
Duque JA, Vivan RR, Duarte MAH, Alcalde MP, Cruz VM, Borges MMB, Bramante CM. Effect of larger apical size on the quality of preparation in curved canals using reciprocating instruments with different heat thermal treatments. Int Endod J 2019; 52:1652-1659. [DOI: 10.1111/iej.13165] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2019] [Accepted: 05/23/2019] [Indexed: 12/15/2022]
Affiliation(s)
- J. A. Duque
- Department of Dentistry, Endodontics, and Dental Materials School of Dentistry of Bauru University of São Paulo Bauru SP Brazil
| | - R. R. Vivan
- Department of Dentistry, Endodontics, and Dental Materials School of Dentistry of Bauru University of São Paulo Bauru SP Brazil
| | - M. A. H. Duarte
- Department of Dentistry, Endodontics, and Dental Materials School of Dentistry of Bauru University of São Paulo Bauru SP Brazil
| | - M. P. Alcalde
- Department of Dentistry, Endodontics, and Dental Materials School of Dentistry of Bauru University of São Paulo Bauru SP Brazil
| | - V. M. Cruz
- Department of Dentistry, Endodontics, and Dental Materials School of Dentistry of Bauru University of São Paulo Bauru SP Brazil
| | - M. M. B. Borges
- Department of Dentistry, Endodontics, and Dental Materials School of Dentistry of Bauru University of São Paulo Bauru SP Brazil
| | - C. M. Bramante
- Department of Dentistry, Endodontics, and Dental Materials School of Dentistry of Bauru University of São Paulo Bauru SP Brazil
| |
Collapse
|