Mechanical properties and surface roughness of polymer-based materials containing DCPD particles

• Published in: Brazilian oral research 2020-01, Vol.34, p.e095-e095
• Main Authors: VILELA, Mateus Silva, BERNAL, Vitória Leão, CHAGAS, Laura Luciana César, VICHI, Flávio Maron, ARANHA, Ana Cecília Corrêa, ARANA-CHAVEZ, Victor Elias, BRAGA, Roberto Ruggiero, RODRIGUES, Marcela Charantola
• Format: Article
• Language: English
• Subjects: Calcium Phosphates; Composite Resins; Dentistry; DENTISTRY, ORAL SURGERY & MEDICINE; Flexural Strength
• ISSN: 1806-8324; 1807-3107; 1807-3107
• DOI: 10.1590/1807-3107bor-2020.vol34.0095

Abstract The purpose of this study was to synthesize dicalcium phosphate dihydrate (DCPD) particles functionalized with triethylene glycol dimethacrylate (TEGDMA) through different routes by varying the receptor solution: ammonium phosphate (AP groups) or calcium nitrate (CN groups) and the moment in which TEGDMA was incorporated: ab initio (ab) or at the end of dripping the solution (ap). Two syntheses were performed without adding TEGDMA (nf). The particles were characterized by X-ray diffractometry, true density (using a helium pycnometer), surface area, and scanning electron microscopy. A 20 vol% of DCPD particles from the D, E, and F groups was added to the resin matrix to determine the degree of conversion (DC), biaxial flexural strength (BFS), the flexural modulus (FM), and surface roughness after an abrasive challenge (RA). A group with silanized barium glass particles was tested as a control. The data were submitted to ANOVA/Tukey’s test (DC, BFS, and RA), and the Kruskal–Wallis test (FM) (alpha = 0.05). BFS values varied between 83 and 142 MPa, and the CN_ab group presented a similar value (123 MPa) to the control group. FM values varied between 3.6 and 8.7 GPa (CN_ab and CN_nf groups, respectively), with a significant difference found only between these groups. RA did not result in significant differences. The use of calcium nitrate solution as a receptor, together with ab initio functionalization formed particles with larger surface areas. Higher BFS values were observed for the material containing DCPD particles with a higher surface area. In general, the DC, FM, and RA values were not affected by the variables studied.