Effects of different irrigation protocols on push-out bond strength of pre-mixed calcium silicate-based cements
Journal of the Australian Ceramic Society. 2023;59(5):1-8.
ABSTRACT
The aim of this study was to evaluate the push-out bond strength and microhardness of three different calcium silicate-based cements for root canal dentin after exposure to different irrigation protocols. Three standardized canal-like holes with an 0.8-mm diameter were created on each root dentin slice with a thickness of 1 ± 0.1 mm and filled with either Biodentine, NeoPUTTY, or Well-Root PT. One hundred samples were randomly divided into five subgroups (n = 20) according to the different irrigation protocols: distilled water, saline, NaOCl, NaOCl/EDTA, and NaOCl/EDTA/CHX. All samples were subjected to a push-out bond strength (PBS) test. Ten specimens of each perforation material were prepared and randomly divided into five subgroups and exposed to the same irrigation protocols. Vickers microhardness (HV) was evaluated. Data were analyzed using a two-way analysis of variance and Tukey HSD test. The level of significance was 5%. The mean PBS values in the Biodentine after control (5.93 ± 1.98), saline (6.21 ± 1.95), and NaOCl/EDTA (5.63 ± 1.56) irrigations were significantly greater than those of NeoPUTTY and Well-Root PT after the same irrigations (p < 0.05). The Biodentine had a significantly higher HV than the NeoPUTTY and Well-Root PT in all irrigation protocols except NaOCl irrigation (p < 0.05). The irrigation protocols did not influence the PBS of the cements. The saline (70.2 ± 8.6) and NaOCl/EDTA (73.7 ± 8.1) resulted in higher surface microhardness values in Biodentine compared to other irrigation protocols. The NeoPUTTY and Well-Root PT can be considered as a potentially useful perforation repair material in all irrigation protocol.
KEYWORDS
Calcium silicate-based materials · Root perforation · Push-out bond strength · Surface microhardness · Irrigation
STUDY SUMMARY
This in vitro study compared three calcium silicate-based cements placed in standardized canal-like cavities in root dentin slices, measuring push-out bond strength and Vickers microhardness after five irrigation protocols. Biodentine gave significantly higher bond strength than the two other cements under several irrigation conditions and higher microhardness in all protocols except sodium hypochlorite alone, while the irrigation protocols themselves did not significantly influence bond strength. Saline and sodium hypochlorite with EDTA were associated with the highest microhardness values for Biodentine.