Abstract
Objectives To evaluate the push-out bond strength of experimental apatite calcium phosphate coated gutta-percha (HAGP) compared to different commercially available coated gutta-percha root obturation points. Methods Extracted teeth were selected and instrumented using ProTaper rotary files. The canals were assigned into five equal groups and obturated using matching single cone technique as follows: EndoREZ cones and EndoREZ sealer, Bioceramic Endosequence gutta-percha (BCGP) with Endosequence BC sealer, Active GP with Endosequence BC sealer (ActiV GP), conventional GP with Endosequence BC sealer, and HAGP with Endosequence BC sealer. Each root was sectioned transversally at the thickness of 1±0.1 mm to obtain 5 sections (n=25 per group). The specimens were subjected to push-out test using a Universal Test Machine at a loading speed of 0.5 mm/ min. Failure modes after push-out test was examined under stereomicroscope and the push-out data were analyzed using ANOVA and the post hoc Dunnett T3 test (p = 0.05). Results The highest mean bond strength was yielded by HAGP followed by BCGP, ActiV GP, conventional GP, and EndoREZ. There were significant differences between EndoREZ and all other groups (p<0.001). The prominent failure mode of HAGP was mixed mode, whereas EndoREZ exhibited adhesive failure mode. Conventional GP, ActiV GP, and BCGP showed cohesive failure mode. Conclusion HAGP showed promising results to be used as root canal filling material in combination with bioceramic sealer.
Highlights
One of the desirable properties of the root canal obturation material is its ability to adhere to root dentine [1]
The aim of this study is to evaluate and compare the push-out bond strength of the novel HAGP to different types of commercially available coated GP root obturation materials
The highest bond strength was yielded by HAGP with a mean strength of 6.18 ± 2.70 MPa followed by Bioceramic Endosequence gutta-percha (BCGP) (5.77 ± 2.78) MPa, ActiV GP (5.38 ± 3.21) MPa, conventional GP (4.65 ± 2.86) MPa, and EndoREZ (0.48 ± 0.20) MPa
Summary
One of the desirable properties of the root canal obturation material is its ability to adhere to root dentine [1]. Good adhesion eliminates any gap that would allow penetration of fluids between the filling and the dentinal wall. Gutta-percha (GP) is the standard root canal obturation material that has many advantages such as biocompatibility, nonstaining, and radiopaque. In order to obtain bonding of GP to sealers, a concept of coating the GP with a material that is similar to the components of the root canal sealer has been introduced. This is to improve its bonding to the sealer and forming a single unit that bond to root dentine which is called “monoblock”
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