التفاصيل البيبلوغرافية
| العنوان: |
Diamondlike Carbon Surface Treatment Improves the Fatigue Resistance of Ultrasonic Tips. |
| المؤلفون: |
Silva, Emmanuel J.N.L., Crozeta, Bruno M., Martins, Jorge N.R., Moreira, Thiago, Vieira, Victor T.L., Braz-Fernandes, Francisco Manuel, Versiani, Marco A. |
| المصدر: |
Journal of Endodontics; Mar2023, Vol. 49 Issue 3, p301-306, 6p |
| مصطلحات موضوعية: |
FATIGUE limit, SURFACE preparation, TITANIUM-aluminum alloys, ULTRASONICS, SURFACE finishing |
| مستخلص: |
The aim of this study was to compare E1-Irrisonic (Helse Ultrasonics, Ocoee, FL) and Irri Black (Helse Ultrasonics), a novel ultrasonic tip with diamondlike carbon treatment, regarding their design, metallurgy, microhardness, bending resistance, and time to fracture under the oscillatory fatigue test. A total of 17 E1-Irrisonic and 17 Irri Black new ultrasonic tips were selected. The tip geometry and surface finishing were assessed using scanning electron microscopy. The elemental composition was defined by energy-dispersive X-ray spectroscopy. Hardness Knoop was calculated using a microhardness tester. The maximum load required to displace the instrument in 45° was recorded in gram/force, oscillatory fatigue was measured in seconds at the moment of instrument fracture, and the size of the separate fragments was determined in millimeters. The Student t test was used for statistical comparison (α = 5%). Scanning electron microscopic analyses revealed that E1-Irrisonic had a flat end tip, whereas a noncutting rounded tip was observed in Irri Black. The surface of E1-Irrisonic was smoother than Irri Black, which was irregular. Energy-dispersive X-ray spectroscopic analyses showed that the elemental compositions of the E1-Irrisonic and Irri Black tips were consistent with stainless steel and titanium-aluminum alloys, respectively. Irri Black showed significantly higher bending load resistance, time to fracture under oscillatory motion, and hardness Knoop than the E1-Irrisonic tip (P <.05), whereas the length of fragments was similar (P >.05). Diamondlike carbon treatment improved hardness Knoop and reduced the flexibility of the Irri Black ultrasonic tip, improving its time to fracture under oscillatory motion compared with the nontreated E1-Irrisonic tip. [ABSTRACT FROM AUTHOR] |
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