Chemo-mechanical properties of the new bioceramic cement PBS CIMMO® compared to MTA REPAIR HP Angelus® cement

Abstract

Objective: To evaluate the bond strength (BS), pH and solubility (Sol) of a new PBS HP® bioceramic cement compared to MTA REPAIR HP® cement. Material and methods: Twenty human premolars were selected for BS analysis. Roots were cut into thirds (cervical, medium and apical) and filled with one of the cements (n=10): PC (PBS HP) or MC (MTA REPAIR HP). Half of these samples were subjected to 2,000 thermal cycles. After 48 hours, the BS test was performed in a universal testing machine (0.5mm/min). Cylindrical specimens (1.0mm in diameter and 10mm in height) were made with PC or MC and immersed in distilled water for pH analysis. After 0.3 and 24 hours, the pH was measured. Solubility was evaluated through the mass loss of the samples after 24 hours. Teflon rings of 20mm in diameter and 1.5mm in height were filled with PC or MC and kept at 37ºC in 100% humidity. Descriptive and exploratory analyzes of BS, pH and Sol data were performed (p<0.05). Results: There was no significant difference in BS between the two types of cement. Thermo cycling did not affect the BS (p>0.05). MC cement showed significantly higher pH values than the PC at the initial and 3 hours (p<0.05). There was no difference between them (p>0.05) after 24 hours. There was no significant difference regarding solubility (p>0.05). Conclusion: Bioceramic cements have similar properties, as they did not differ in relation to dentin bond strength, pH after 24 hours and solubility.