Compositional boundaries for functional dental composites containing calcium orthophosphate particles.
J Mech Behav Biomed Mater
; 144: 105928, 2023 08.
Article
en En
| MEDLINE
| ID: mdl-37302206
ABSTRACT
OBJECTIVES:
To investigate the interrelationships among handling, degree of conversion (DC), mechanical behavior and Ca2+ release of composites containing dicalcium phosphate dihydrate (DCPD, CaHPO4.2H2O), as a function of total inorganic content and DCPD glass ratio.METHODS:
Twenty-one formulations (1 BisGMA 1 TEGDMA, in mols) with inorganic fractions ranging from zero to 50 vol% and different DCPD glass ratios were evaluated for viscosity (parallel plate rheometer, n = 3), DC (near-FTIR spectroscopy, n = 3), fracture toughness/K1C (single-edge notched beam, n = 7-11) and 14-day Ca2+ release (inductively coupled plasma optical emission spectroscopy, n = 3). Data were analyzed by ANOVA/Tukey test (except viscosity, where Kruskal-Wallis/Dunn tests were used, α 0.05).RESULTS:
Viscosity and DC increased with DCPD glass ratio among composites with the same inorganic content (p < 0.001). At inorganic fractions of 40 vol% and 50 vol%, keeping DCPD content at a maximum of 30 vol% did not compromise K1C. Ca2+ release showed an exponential relationship with DCPD mass fraction in the formulation (R2 = 0.986). After 14 days, a maximum of 3.8% of the Ca2+ mass in the specimen was released.CONCLUSION:
Formulations containing 30 vol% DCPD and 10-20 vol% glass represent the best compromise between viscosity, K1C and Ca2+ release. Materials with 40 vol% DCPD should not be disregarded, bearing in mind that Ca2+ release will be maximized at the expense of K1C.Palabras clave
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Bases de datos:
MEDLINE
Asunto principal:
Fosfatos
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Calcio
Idioma:
En
Revista:
J Mech Behav Biomed Mater
Asunto de la revista:
ENGENHARIA BIOMEDICA
Año:
2023
Tipo del documento:
Article