Cyclic Fatigue Resistance of Nickel-Titanium Reciprocating Instruments after Simulated Clinical Use |
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| Affiliation: | 1. Department of Endodontics, Ourinhos Integrated School, Ourinhos, São Paulo, Brazil;2. Department of Dentistry, Endodontics, and Dental Materials, School of Dentistry of Bauru, University of São Paulo, São Paulo, São Paulo, Brazil;3. Department of Endodontics, Grande Rio University, Duque de Caxias, Rio de Janeiro, Brazil;1. The State Key Laboratory Breeding Base of Basic Science of Stomatology (Hubei-MOST) and Key Laboratory of Oral Biomedicine Ministry of Education, School and Hospital of Stomatology, Wuhan University, Wuhan, China;2. Division of Endodontics, Department of Oral Biological & Medical Sciences, Faculty of Dentistry, University of British Columbia, Vancouver, Canada;3. Department of Endodontics, University of Alabama at Birmingham, Birmingham, Alabama;1. POPCAD Research Group, Laboratory of Immunodetection and Bioanalysis, Faculty of Dentistry, University of Antioquia, Medellín, Colombia;2. Department of Endodontics and Dental Research Group, Iguaçu University, Nova Iguaçu, Rio de Janeiro, Brazil;3. Postgraduate Program in Dentistry, University of Grande Rio, Duque de Caxias, Rio de Janeiro, Brazil;1. Federal University of Paraíba, João Pessoa, Paraíba, Brazil;2. Department of Morphology, Federal University of Paraíba, João Pessoa, Paraíba, Brazil;3. Department of Restorative Dentistry, Federal University of Paraíba, João Pessoa, Paraíba, Brazil;4. Department of Endodontics, State University of Rio de Janeiro, Rio de Janeiro, Rio de Janeiro, Brazil;6. Department of Endodontics, Grande Rio University, Rio de Janeiro, Rio de Janeiro, Brazil;5. Department of Dentistry Clinic, Federal University of Espirito Santo, Vitoria, Espirito Santo, Brazil;1. Faculty of Dentistry, Department of Oral Biological and Medical Sciences, The University of British Columbia, Vancouver, Bitish Columbia, Canada;2. Department of Conservative Dentistry and Endodontics, Guanghua School of Stomatology, Guangdong Province Key Laboratory of Stomatology, Sun Yat-Sen University, Guangzhou, Guangdong Province, China;3. Department of Materials Engineering, The University of British Columbia, Vancouver, Bitish Columbia, Canada |
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| Abstract: | IntroductionThe 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.MethodsA 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.ResultsThe 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).ConclusionsProDesign 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. |
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| Keywords: | Cyclic fatigue nickel-titanium alloy reciprocating kinematics |
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