10th ConsEuro, 22 - 24 April 2021, pp.82
Aim: To evaluate the shear bond strength (SBS) of indirect pulp capping materials to caries
affected dentin (CAD) with/without chlorhexidine (CHX) pretreatment.
Materials and Methods: Coronal dentin surfaces of 150 extracted sound human molar teeth were
ground flat. Artificial CAD were obtained. Half of the specimens were pretreated with 2%CHX and
half of them received no-pretreatment before the application of indirect pulp capping materials
(n=15). Five materials were assessed: 1-Conventional glass ionomer cement (Fuji IX, GC, Japan)
(CGIC) 2-Resin modified glass ionomer cement (Fuji II GC, Japan) (RMGIC), 3-Resin modified glass
ionomer bioactive cement (Activa Bioactive, Pulpdent, USA) (ACT) 4-Resin modified tricalcium
silicate (Theracal, Bisco, USA) (RMCS), 5-Water-based tricalcium silicate, (Biodentine, Septodont,
France) (WBCS). To evaluate the SBS, the Universal Test machine was used (1mm/min).
Data were evaluated by Student’s t-test and one-way ANOVA. The differences between
groups were analyzed by Mann-Whitney U and Kruskal-Wallis test. Pairwise comparisons were
determined with the post-hoc Tukey HSD or Dunn-Bonferroni test. Unless otherwise stated,
results for p<0.05 were considered statistically significant. Bonferroni Correction was made to
control Type I error in multiple comparisons.
Results: Among the groups without pretreatment; SBS of RMCS [0.72(0.59-1.09) MPa] and WBCS
[0.89 (0.31-1.05) MPa] were found to be significantly lower compared to ACT [4.37(3.34-6.45) MPa],
CGIC [2.52(1.88-6.36) MPa] and RMGIC [5.24(3.23-8.27) MPa] (p<0.01). There were no significant
differences between Group ACT, CGIC and RMGIC and between Group RMCS and WBCS(p>0.05).
Among the CHX pretreated samples, SBS of Group RMCS [0.43(0.14-0.86) MPa] and WBCS
[0.21(0.16-0.35) MPa] were found to be significantly lower than Group ACT [4.33(2.68-7.06) MPa],
CGIC [4.36(3.61-7.44) MPa] and RMGIC [7.56(6.38-10.29) MPa] (p<0.01). There were no significant
differences between Group ACT, CGIC and RMGIC and between Group RMCS and WBCS (p>0.05).
There was no statistically significant difference between the groups with and without CHX
pretreatment in all materials (p>0.010) except for WBCS. CHX pretreated WBCS group showed
lower SBS than the WBCS/without CHX (p=0.007).
Conclusion: Tricalcium silicate-based materials had lower shear bond strength than glass
ionomer-based materials, both with and without pre-treatment of CHX.
*This study was funded by Scientific and Technological Research Council of Turkey (TUBITAK)
Keywords: indirect pulp capping material, shear bond strength, caries affected dentin