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Aim To evaluate the tissue reaction of a tricalcium silicate‐based repair material associated with 30% calcium tungstate (TCS + CaWO4) in comparison to Bio‐C Repair (Bio‐C; Angelus) and to MTA Repair HP (MTA HP; Angelus). Methodology Polyethylene tubes filled with one of the materials or left empty (control group, CG) were implanted into the subcutaneous tissues of rats for 7, 15, 30 and 60 days (n = 32/group). The capsule thickness, number of inflammatory cells, collagen content, interleukin‐6 (IL‐6), osteocalcin (OCN), von Kossa reaction and analysis under polarized light were evaluated. The data were subjected to generalized linear models for repeated measures, except the OCN. OCN data were submitted to Kruskal–Wallis and Dunn's post hoc test and Friedman followed by Nemenyi's test at significance level of 5%. Results At all time points, significant differences in the number of inflammatory cells were not observed between TCS + CaWO4 and Bio‐C, whereas, at 15, 30 and 60 days, no significant difference was detected between TCS + CaWO4 and MTA HP. At all periods, significant differences were not detected in the number of fibroblasts in TCS + CaWO4 versus MTA HP, and, at 60 days, no significant difference was demonstrated between these groups and CG. Significant differences in the immunoexpression of IL‐6 were not detected amongst bioceramic materials at all periods. From 7 to 60 days, significant reduction in the number of inflammatory cells, number of IL‐6‐immunopositive cells and in the capsule thickness was accompanied by significant increase in the collagen in all groups. OCN‐immunolabelled cells, von Kossa‐positive structures and amorphous calcite deposits were observed around all materials, whereas, in the CG, these structures were not seen. Conclusions These findings indicate that the experimental material (TCS + CaWO4) is biocompatible and has a bioactive potential, similar to the MTA HP and Bio‐C Repair, and suggest its use as a root repair material.

As the biocompatibility and bioactive potential of repair materials are desired characteristics in dentistry, the tissue response of Bio‐C Pulpo, a bioceramic material launched on the marked by Angelus (Brazil), was compared with Biodentine (Septodont, France) and White MTA (WMTA; Angelus, Brazil). In 32 rats, 148 polyethylene tubes filled with Bio‐C Pulpo, Biodentine or WMTA, and empty (CG, control group) were implanted into subcutaneous tissues for 7, 15, 30, and 60 days. The capsule thickness, numerical density of inflammatory cells (IC) and fibroblasts (Fb), amount of collagen, immunohistochemistry detection of interleukin‐6 (IL‐6) and osteocalcin (OCN), von Kossa and analysis under polarized light were performed. Data were subjected to two‐way ANOVA followed by Tukey's test (p ≤ 0.05). At 7 and 15 days, the capsules around Bio‐C Pulpo were thicker than in WMTA while, at 30 and 60 days, significant differences were not observed among the groups. Although at 7, 15, and 30 days, a greater number of IL‐6‐immunostained cells was found in Bio‐C Pulpo and Biodentine than in WMTA, no significant difference was detected among the groups at 60 days. In all groups, the number of Fb and collagen content increased significantly over time. The capsules around materials exhibited von Kossa‐positive and birefringent structures, and OCN‐immunostained cells whereas, in the CG, these structures were not observed. Bio‐C Pulpo, similarly to Biodentine and WMTA, is biocompatible, allows the connective tissue repair and presents bioactive potential in connective tissue of rats.

Biosilicate is a bioactive glass–ceramic used in medical and dental applications. This study evaluated novel reparative materials composed of pure tricalcium silicate (TCS), 30% zirconium oxide (ZrO2) and 10 or 20% biosilicate, in comparison with Biodentine. Setting time was evaluated based on ISO 6876 standard, radiopacity by radiographic analysis, solubility by mass loss, and pH by using a pH meter. Cytotoxicity was evaluated by 3‐(4,5‐dimethylthiazol‐2‐yl)‐2,5‐diphenyltetrazolium bromide and NR assays. Alkaline phosphatase (ALP) activity and alizarin red were used to evaluate cell bioactivity. Antimicrobial activity was assessed on Enterococcus faecalis by the direct contact test. The data were submitted to analysis of variance (ANOVA)/Tukey; Bonferroni and Kruskal–Wallis, and Dunn tests (α = 0.05). The association of Biosilicate with TCS + ZrO2 had appropriate setting time, radiopacity, and solubility, alkaline pH, and antimicrobial activity. TCS and Biodentine showed higher ALP activity in 14 days than the control (serum‐free medium). All cements produced mineralized nodules. In conclusion, Biosilicate + TCS ZrO2 decreased the setting time and increased the radiopacity in comparison to TCS. Biosilicate + TCS ZrO2 presented lower solubility and higher radiopacity than Biodentine. In addition, these experimental cements promoted antimicrobial activity and mineralization nodules formation, suggesting their potential for clinical use.

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