TY - JOUR
T1 - Diamondlike Carbon Surface Treatment Improves the Fatigue Resistance of Ultrasonic Tips
AU - Silva, Emmanuel J. N. L.
AU - Crozeta, Bruno M.
AU - Martins, Jorge N. R.
AU - Moreira, Thiago
AU - Vieira, Victor T. L.
AU - Braz-Fernandes, Francisco Manuel
AU - Versiani, Marco A.
N1 - Funding Information:
Supported in part by Conselho Nacional de Desenvolvimento Científico e Tecnológico ( CNPq) and Fundação de Amparo à Pesquisa do Estado do Rio de Janeiro ( FAPERJ) . F.M.B.-F. acknowledges the funding of CENIMAT/i3N by national funds through the Fundação para a Ciência e a Tecnologia , IP, within the scope of Multiannual Financing of R&D Units (reference UIDB/50025/2020-2023 ).
Publisher Copyright:
© 2022 American Association of Endodontists
PY - 2023/3
Y1 - 2023/3
N2 - Introduction: 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. Methods: 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%). Results: 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). Conclusion: 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.
AB - Introduction: 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. Methods: 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%). Results: 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). Conclusion: 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.
KW - Bending resistance
KW - diamond-like carbon coating
KW - endodontics
KW - fatigue resistance
KW - metallurgical characteristics
KW - ultrasonic tips
UR - http://www.scopus.com/inward/record.url?scp=85147118852&partnerID=8YFLogxK
U2 - 10.1016/j.joen.2022.12.008
DO - 10.1016/j.joen.2022.12.008
M3 - Article
C2 - 36567061
AN - SCOPUS:85147118852
SN - 0099-2399
VL - 49
SP - 301
EP - 306
JO - Journal of Endodontics
JF - Journal of Endodontics
IS - 3
ER -