Mechanical characterization and ion release of bioactive dental composites containing calcium phosphate particles
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Journal of the Mechanical Behavior of Biomedical Materials
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Objective: to verify the effect of the addition of dicalcium phosphate dihydrate (DCPD) particles functionalized
with di- or triethylene glycol dimethacrylate (DEGDMA or TEGDMA) on the degree of conversion (DC), post-gel
shrinkage (PS), mechanical properties, and ion release of experimental composites.
Methods: Four composites were prepared containing a BisGMA/TEGDMA matrix and 60 vol% of fillers. The
positive control contained only barium glass fillers, while in the other composites 15 vol% of the barium was
replaced by DCPD. Besides the functionalized particles, non-functionalized DCPD was also tested. DC after 24 h
(n=3) was determined by FTIR spectroscopy. The strain gage method was used to obtain PS 5 min after
photoactivation (n=5). Flexural strength and modulus (n=10) were calculated based on the biaxial flexural
test results, after specimen storage for 24 h or 60 days in water. The same storage times were used for fracture
toughness testing (FT, n=10). Calcium and phosphate release up to 60 days was quantified by ICP-OES (n=3).
Data were analyzed by ANOVA/Tukey test (alpha: 5%).
Results: Composites containing functionalized DCPD presented higher DC than the control (p < 0.001). The
material containing DEGDMA-functionalized particles showed higher PS than the other composites (p < 0.001).
After 60 days, only the composite with DEGDMA-functionalized DCPD presented fracture strength similar to the
control, while for flexural modulus only the composite with TEGDMA-functionalized particles was lower than
the control (p < 0.001). FT of all composites containing DCPD was higher than the control after 60 days
(p < 0.005). Calcium release was higher for the composite with non-functionalized DCPD at 15 days and no
significant reductions were observed for composites with functionalized DCPD during the observation period
(p < 0.001). For all the tested composites, phosphate release was higher at 15 days than in the subsequent
periods, and no difference among them was recorded at 45 and 60 days (p < 0.001).
Conclusions: DCPD functionalization affected all the studied variables. The composite with DEGDMA-functionalized
particles was the only material with strength similar to the control after 60 days in water; however, it
also presented the highest shrinkage. The presence of DCPD improved FT, regardless of functionalization. DCPD
functionalization reduced ion release only during the first 15 days.
Como referenciar
NATALE, LIVIA C.; RODRIGUES, MARCELA C.; ALANIA, YVETTE; CHIARI, MARINA D.S.; BOARO, LETICIA C.C.; COTRIM, MARYCEL; VEGA, OSCAR; BRAGA, ROBERTO R. Mechanical characterization and ion release of bioactive dental composites containing calcium phosphate particles. Journal of the Mechanical Behavior of Biomedical Materials, v. 84, p. 161-167, 2018. DOI: 10.1016/j.jmbbm.2018.05.022. Disponível em: http://repositorio.ipen.br/handle/123456789/29253. Acesso em: 27 Mar 2026.
Esta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.