Abstract
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.
Key Words
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Article info
Publication history
Published online: December 22, 2022
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