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. 2023 Sep 18;23(1):673.
doi: 10.1186/s12903-023-03377-1.

Influence of long -term thermal cycling and masticatory loading simulation on bond strength of roots filled with epoxy resin and calcium silicate based sealers

Ahlam Smran  1   2 , Mariam Abdullah  3 , Norasmatul Akma Ahmad  1 , Ali Alrahlah  4 , Nassr Al-Maflehi  5 , Abdulaziz Samran  2   6
Affiliations

Influence of long -term thermal cycling and masticatory loading simulation on bond strength of roots filled with epoxy resin and calcium silicate based sealers

Ahlam Smran et al. BMC Oral Health. .

Abstract

Background: 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.

Methods: 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 (n = 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) (n = 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 × 105 and 6 × 105 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.

Results: After thermal-mechanical cyclic aging, the two root canal sealers showed a significantly decreased in push-out bond strength (p < 0.05), however, AH Plus had significantly higher bond strength values than BioRoot RCS after cycling aging.

Conclusions: 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.

Keywords: AH plus; Calcium silicate sealer; Mechanical cycling; Push out bond strength; Thermal.

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Conflict of interest statement

The authors declare no competing interests.

Figures

Fig. 1
Fig. 1
Schematic presentation of prepared specimens and push-out testing. A Root canal treatment and canal obturation with tested sealers. B Embedding the root in acrylic resin block. C Thermal variations in a thermal cycling machine. D Mechanical cycling in a mastication simulator machine. E, F Coronal, middle, and apical root-dentin sections. G Load application in universal testing machine using 3 different plunger diameters
Fig. 2
Fig. 2
Inspection of the apical (a) and coronal (b) aspects of the slices following sectioning of the tooth horizontally
Fig. 3
Fig. 3
Digital microscopic examination of the samples at 100 magnification and various failure modes. Adhesive (a), cohesive (b) and mixed (c) failure types
Fig. 4
Fig. 4
Distribution of failure modes in AH Plus and BioRoot RCS groups (in %)
See this image and copyright information in PMC

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