Cyclic fatigue of Reciproc and WaveOne
reciprocating instruments
G. Plotino, N. M. Grande, L. Testarelli & G. Gambarini
Abstract
Plotino G, Grande NM, Testarelli L, Gambarini G. Cyclic fatigue of Reciproc and WaveOne reciprocating instruments. International Endodontic Journal, 45, 614–618, 2012.
Aim To evaluate the cyclic fatigue resistance of ReciprocÒ and WaveOneÒ instruments in simulated root canals.
Methodology Two groups of 15 NiTi endodontic instruments of identical tip size of 0.25 mm were tested, group A; ReciprocÒ R25 and group B: Wave- OneÒ primary. Cyclic fatigue testing was performed in a stainless steel artificial canal manufactured by repro- ducing the instrument’s size and taper. A simulated root canal with a 60° angle of curvature and 5-mm radius of curvature was constructed for both the instruments tested. The centre of the curvature was 5 mm from the tip of the instrument and the curved segment of the canal was approximately 5 mm in length. The ReciprocÒ instruments were activated using the preset programme specific for the ReciprocÒ instruments, whilst the WaveOneÒ instruments were activated using the preset programme specific for the WaveOneÒ instruments. All instruments were rotated until fracture occurred and the time to fracture (TtF) and the length of the fractured tip were recorded and registered. Means and standard deviations of TtF and fragment length were calculated for each system and data were subjected to Student’s t-test (P < 0.05). Results A statistically significant difference (P < 0.05) was noted between ReciprocÒ and WaveOneÒ instru- ments. ReciprocÒ R25 instruments were associated with a significant increase in the mean time to fracture when compared with primary WaveOneÒ instruments (130.8 ± 18.4 vs. 97.8 ± 15.9 s). There was no signif- icant difference (P > 0.05) in the mean length of the fractured fragments between the instruments. Conclusions ReciprocÒ instruments were associated with a significantly higher cyclic fatigue resistance than WaveOneÒ instruments.
Keywords: cyclic fatigue, nickel–titanium, recipro- cation.
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Plotino G, Grande NM, Testarelli L, Gambarini G. Cyclic fatigue of Reciproc and WaveOne reciprocating instruments. International Endodontic Journal, 45, 614–618, 2012.
Aim To evaluate the cyclic fatigue resistance of ReciprocÒ and WaveOneÒ instruments in simulated root canals.
Methodology Two groups of 15 NiTi endodontic instruments of identical tip size of 0.25 mm were tested, group A; ReciprocÒ R25 and group B: Wave- OneÒ primary. Cyclic fatigue testing was performed in a stainless steel artificial canal manufactured by repro- ducing the instrument’s size and taper. A simulated root canal with a 60° angle of curvature and 5-mm radius of curvature was constructed for both the instruments tested. The centre of the curvature was 5 mm from the tip of the instrument and the curved segment of the canal was approximately 5 mm in length. The ReciprocÒ instruments were activated using the preset programme specific for the ReciprocÒ instruments, whilst the WaveOneÒ instruments were activated using the preset programme specific for the WaveOneÒ instruments. All instruments were rotated until fracture occurred and the time to fracture (TtF) and the length of the fractured tip were recorded and registered. Means and standard deviations of TtF and fragment length were calculated for each system and data were subjected to Student’s t-test (P < 0.05). Results A statistically significant difference (P < 0.05) was noted between ReciprocÒ and WaveOneÒ instru- ments. ReciprocÒ R25 instruments were associated with a significant increase in the mean time to fracture when compared with primary WaveOneÒ instruments (130.8 ± 18.4 vs. 97.8 ± 15.9 s). There was no signif- icant difference (P > 0.05) in the mean length of the fractured fragments between the instruments. Conclusions ReciprocÒ instruments were associated with a significantly higher cyclic fatigue resistance than WaveOneÒ instruments.
Keywords: cyclic fatigue, nickel–titanium, recipro- cation.
download paper in pdf
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