Influence of temperature on cyclic fatigue resistance of nickel-titanium reciprocating files / Tan Tat Wah
Aim: To evaluate cyclic fatigue resistance of Reciproc Blue R25 and WaveOne Gold Primary at 20°C and 35°C. Material & Methods: Cyclic fatigue resistance of rotary nickel-titanium instrument, Reciproc Blue R25 (VDW Dental, Munich, Germany) and WaveOne Gold Primary (Dentsply Maillefer, Baillag...
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| 格式: | Thesis |
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2019
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| 在线阅读: | http://studentsrepo.um.edu.my/11208/4/tat_wah.pdf http://studentsrepo.um.edu.my/11208/ |
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| 总结: | Aim: To evaluate cyclic fatigue resistance of Reciproc Blue R25 and WaveOne Gold
Primary at 20°C and 35°C.
Material & Methods: Cyclic fatigue resistance of rotary nickel-titanium instrument,
Reciproc Blue R25 (VDW Dental, Munich, Germany) and WaveOne Gold Primary
(Dentsply Maillefer, Baillagues, Switzerland) files were tested at 20°C and 35°C in a
stainless steel artificial canal, with 60° angle of curvature and curvature radius of 5 mm.
The instruments reciprocated freely within the stainless steel canal until fracture. Time
between commencement of the rotation and file breakage was recorded. The length of
the fractured fragments were noted. Two-way ANOVA was used to compare the length
of the fractured fragments, the time to failure (in seconds) of same system between
temperatures, and the time to failure of different system at the same temperature. The
level of significance was set at α=0.01.
Results: There were no statistically significant differences among the fracture length of
separated instruments (p>0.05). Reciproc Blue R25 showed a statistically significant
reduction in fatigue life at 35°C compared with 20°C (p<0.001) whereas WaveOne
Gold Primary had no significant difference in cyclic fatigue resistance between the 2
temperatures tested (p>0.05), Reciproc Blue R25 instruments exhibited a significantly
higher resistance to cyclic fatigue than WaveOne Gold Primary instruments at both
20°C and 35°C (p<0.001).
Conclusion: Cyclic fatigue resistance of Reciproc Blue is significantly reduced when
the environmental temperature is increased from 20°C to 35°C. However, increasing
environmental temperature from 20°C to 35°C does not affect the cyclic fatigue
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resistance of WaveOne Gold. Reciproc Blue showed significant better cyclic fatigue
resistance than WaveOne Gold at both 20°C and 35°C.
Keywords: Cyclic fatigue resistance, nickel-titanium, temperature, reciprocating |
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