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Niobium pentoxide as a new filler for methacrylate‐based root canal sealers
Author(s) -
Leitune V. C. B.,
Takimi A.,
Collares F. M.,
Santos P. D.,
Provenzi C.,
Bergmann C. P.,
Samuel S. M. W.
Publication year - 2013
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.1365-2591.2012.02107.x
Subject(s) - materials science , root canal , indentation hardness , nuclear chemistry , composite material , dentistry , chemistry , medicine , microstructure
Aim To evaluate the influence of several niobium pentoxide ( Nb 2 O 5 ) concentrations on the radio‐opacity, flow, film thickness, microhardness and degree of conversion of an experimental root canal sealer. Methodology An experimental dual‐cured root canal sealer was produced with a methacrylate‐based comonomer blend. Nb 2 O 5 was added at four different concentrations: 0, 80, 100 and 120 wt%. Radio‐opacity was evaluated according to ISO 6876 using a digital system ( n = 5). Flow and film thickness were determined in accordance with ISO 6876 ( n = 3). Microhardness was evaluated with 50 g for 15 s ( n = 5). Degree of conversion was evaluated with FTIR immediately after photocuring and after 1, 7 and 14 days. The data were analysed using anova and T ukey's test. The degree of conversion over time was evaluated using RM ‐ anova (α = 0.05). Results The groups with 80 wt% and 100 wt% of filler showed no significant difference in radio‐opacity from that of equivalent 2 mmAl ( P > 0.05). The addition of 120 wt% resulted in radio‐opacity values higher than 2 mmAl ( P < 0.05). The flow was not significantly different amongst the different groups ( P > 0.05). All groups had a film thickness of <50 μm ( ISO 6876). All groups with Nb 2 O 5 were associated with higher values of microhardness than the control group. The group with 0 wt% was associated with a higher degree of conversion at all times. All groups except those with 80 wt% had higher values for degree of conversion after 14 days than immediately after photocuring. Conclusion The addition of Nb 2 O 5 increases radio‐opacity and microhardness; this material may be a promising filler for the production of a new endodontic sealer.