Cyclic Fatigue Resistance of Nickel-Titanium Reciprocating Instruments after Simulated Clinical Use
| Autor: | Rodrigo Ricci Vivan, Murilo Priori Alcalde, Emmanuel João Nogueira Leal Silva, Jussaro Alves Duque, Marco Antonio Hungaro Duarte, Clóvis Monteiro Bramante |
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| Rok vydání: | 2020 |
| Předmět: |
Titanium
0301 basic medicine Orthodontics Dental Instruments Cyclic stress Materials science Equipment Design 030206 dentistry 03 medical and health sciences Reciprocating motion 030104 developmental biology 0302 clinical medicine Nickel Nickel titanium Unpaired t-Test Tukey's range test Equipment Failure General Dentistry |
| Zdroj: | Journal of Endodontics. 46:1771-1775 |
| ISSN: | 0099-2399 |
| Popis: | 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.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.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).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. |
| Databáze: | OpenAIRE |
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