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An ex vivo comparison of three different gutta‐percha cones when compacted at different temperatures: rheological considerations in relation to the filling of lateral canals
Author(s) -
Venturi M.,
Di Lenarda R.,
Breschi L.
Publication year - 2006
Publication title -
international endodontic journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.988
H-Index - 119
eISSN - 1365-2591
pISSN - 0143-2885
DOI - 10.1111/j.1365-2591.2006.01133.x
Subject(s) - gutta percha , rheology , materials science , composite material , dentistry , medicine , root canal
Aim To compare ex vivo the penetration of three brands of gutta‐percha cones, compacted under a constant force and heated to different temperatures, into artificial lateral canals. Methodology Resin blocks with simulated main canals, each having two lateral canals (C at 6.5 and A at 13 mm from the surface of the resin block), were selected. A gutta‐percha cone, either Mynol MF, Hygenic MF or GT Tulsa 0.04 was compacted into each main canal for 5 s using a wire rod with a diameter of 0.7 mm soldered to the bottom of a metal cylinder, with a force of 2.7 kg at controlled temperatures of 37, 42, 47, 52, 60 °C. The penetration of each brand of gutta‐percha into 60 lateral canals (10 at each temperature) was measured using a stereomicroscope. Statistical analysis was performed using the anova , the Scheffè test and the t ‐test. Results None of the three brands of cones entered up to 0.1 mm within either lateral canal until a temperature of 47 °C was reached; at that temperature only Mynol cones ( P ≤ 0.05) penetrated in four of 10 A‐level canals (mean 0.13 ± 0.19 mm) and in all 10 C‐level canals (mean 0.43 ± 0.12 mm). The A‐level lateral canals were penetrated at 52 °C by Mynol cones (mean 0.76 ± 0.34 mm) to a significantly greater distance ( P ≤ 0.05) than Tulsa cones (mean 0.31 ± 0.12 mm) and Hygenic cones (mean 0.11 ± 0.08 mm). At 60 °C the Mynol cones (mean 1.93 ± 0.34 mm) penetrated significantly more ( P ≤ 0.05) than the Tulsa cones (mean 0.86 ± 0.22 mm) and Hygenic cones (mean 0.67 ± 0.19 mm). The C‐level lateral canals were penetrated at 52 °C by Mynol cones (mean 0.91 ± 0.29 mm) to a significantly greater distance ( P ≤ 0.05) than Tulsa cones (mean 0.47 ± 0.16 mm) and Hygenic cones (mean 0.46 ± 0.15 mm), whilst no significant difference was found at 60 °C. Conclusions When heated and compacted, the three gutta‐percha cones penetrated the lateral canals to different degrees. They penetrated more than 0.43 mm into the lateral canals only at temperatures higher than 47 °C.