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Abdullah, Mariam
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article
Influence of long -term thermal cycling and masticatory loading simulation on bond strength of roots filled with epoxy resin and calcium silicate based sealers
Abstract
<jats:title>Abstract</jats:title><jats:sec><jats:title>Background</jats:title><jats:p>The aim of this study was to evaluate the effect of thermal and mechanical cyclic aging using a mastication simulator on push-out bond strength of mandibular premolars obturated with AH Plus and BioRoot RCS root canal sealers.</jats:p></jats:sec><jats:sec><jats:title>Methods</jats:title><jats:p>With REVO-S files up to SU/0.06 taper, 48 single-rooted premolar teeth were instrumented. The teeth were randomly divided into two main groups (<jats:italic>n</jats:italic> = 24) based on the two root canal sealers used (AH Plus and BioRoot RCS). All teeth were obturated with h matched-taper single-cone. Each main group was then subdivided into three subgroups (A, B, and C) (<jats:italic>n</jats:italic> = 8). Group A served as the negative control group (no-thermocycling aging). While groups B and C were subjected to thermal changes in a thermocycler machine (15,000 and 30,000 thermal cycles, respectively), followed by two different dynamic loading periods, 3 × 10<jats:sup>5</jats:sup> and 6 × 10<jats:sup>5</jats:sup> in a masticatory simulator with a nominal load of 5 kg at 1.2 Hz which represent roughly 1½ and 3 years of clinical function respectively. 2 mm slice at 3 levels, apical, middle, and coronal, to obtain 3 sections were prepared and subjected to push-out test using a universal testing machine. Statistical analysis was performed using analysis of variance (ANOVA) followed by a Tukey post hoc comparisons test and an independent T-test. A significance level of 5% was used.</jats:p></jats:sec><jats:sec><jats:title>Results</jats:title><jats:p>After thermal–mechanical cyclic aging, the two root canal sealers showed a significantly decreased in push-out bond strength (<jats:italic>p</jats:italic> < 0.05), however, AH Plus had significantly higher bond strength values than BioRoot RCS after cycling aging.</jats:p></jats:sec><jats:sec><jats:title>Conclusions</jats:title><jats:p>It could be concluded that thermal–mechanical cyclic aging had a significant impact on the outcome of the dislodgment resistance of AH Plus and BioRoot RCS.</jats:p></jats:sec>