Objectives: This in vitro study evaluated the
microtensile bond strength (MTBS) of a methacrylate-
based compared to a silorane-based resin composite in Class I cavity using
different placement techniques.Materials and Methods: Class I cavities with dimension of (4
mm long, 4 mm wide, 3 mm deep) were prepared in extracted sound human molars.
The teeth were randomly divided into six groups. The first three groups were
filled with Filtek P90 using three methods of insertion; bulk, incremental and
snow-plow, and the remaining three groups were filled with Clearfil AP-X using
the same three placement techniques. After 24 hours of storage in water at 37°C,
the specimens were thermocycled to 1000 cycles. Specimens were prepared for MTBS
testing by creating bonded beams obtained from the pulpal floor. Statistical
analysis used: Statistical analyses of data were performed by two-way ANOVA/Tukey
(α=.05). Results: The experiment showed significant differences
between the two resin composites with regard to filling techniques (P<0.05). The
MTBS was significantly higher in each of Filtek P90 subgroup compared to
Clearfil AP-X ones (P<0.05). With respect to filling technique in both resin
composites, bulk insertion showed the significantly lowest MTBS (P<0.05), while
no significant difference was found between the outcome of incremental and
snow-plow techniques (P>0.05). Conclusion:
Silorane-based resin composite as opposed to methacrylate based resin composite
and layering placements in contrast to bulk filling method had higher
microtensile bond strength.
Keywords:: Bond strength, bulk filling, incremental filling, resin composite, snow-plow.
open-access license: This is an open access article licensed under the terms of the (https://creativecommons.org/licenses/by/4.0/legalcode), which permits unrestricted, noncommercial
use, distribution and reproduction in any medium, provided the work is properly cited.
The authors would like to acknowledge the research chancellor of Mashhad University of Medical Sciences for providing this research with financial support (grant number 900672). The results described in this paper have been taken from a DDS, MS undergraduate student thesis (# 2590).
Open-Access License: This is an open access article distributed under the terms of the Creative Commons Attribution 4.0 International Public License (CC-BY 4.0), a copy of which is available at: https://creativecommons.org/licenses/by/4.0/legalcode. This license permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
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Mashhad, Iran; Tel: 989155143349; Fax: 51-38829500;