Deformations and cyclic fatigue resistance of nickel-titanium instruments inside a sequence

Gambarini, Gianluca and Plotino, Gianluca and Piasecki, Lucila and Al-Sudani, Dina and Testarelli, Luca and Sannino, Gianpaolo (2015) Deformations and cyclic fatigue resistance of nickel-titanium instruments inside a sequence. Annali di stomatologia, 6 (1). pp. 6-9. ISSN 1971-1441

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To compare the effect of brushing motion on torsional and cyclic fatigue resistance of TF Adaptive instruments after clinical use. 20 packs of TFA small sequence (SybronEndo, Orange, CA, USA) were used for this study and divided into two groups. Each instrument prepared one resin tooth, consisting in 4 canals with a complex anatomy. In group A, no brushing motion was performed. In group B, after the green instrument reached the working length, brushing motion with circumferential filing was performed for 15 seconds in each canal (overall 1 minute). All the instruments were then subjected to cyclic fatigue test and mean values and standard deviation for time to fracture were evaluated. Data were subjected to one-way analysis of variance and Bonferroni t-test procedure with a significance set at P < 0.05. No instruments were broken during preparation of root canals. Two TF Adaptive green and 5 yellow showed unwinding after intra-canal clinical use. No statistically significant differences were found between green instruments of both groups (P > 0.05), while a statistically significant difference was found between the Yellow instruments (P < 0.05), with group B showing an higher resistance to cyclic fatigue. A prolonged passive brushing motion did not adversely affected mechanical resistance of the instrument used for this purpose. Resistance to both deformations and cyclic fatigue of the second instrument within the TFA small sequence was enhanced by the coronal flaring provided by the brushing action of the first instrument used.

Item Type: Article
Uncontrolled Keywords: nickel-titanium, brushing action, deformations, cyclic fatigue
Subjects: 600 Tecnologia - Scienze applicate > 610 Medicina e salute (Classificare qui la tecnologia dei servizi medici)
Depositing User: Marina Spanti
Date Deposited: 13 Jan 2016 10:49
Last Modified: 13 Jan 2016 10:49

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