Effect of calcium orthophosphate: Reinforcing glass ratio and prolonged water storage on flexural properties of remineralizing composites

Vilela, Handially S.; Campos, Amanda L.; Chiari, Marina D.S.; Vieira, Douglas N.; Braga, Roberto Ruggiero

doi:10.1016/j.jmbbm.2020.103637

Cited by 11 publications

(8 citation statements)

References 35 publications

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“…As observed in a previous study, 16 composite biaxial flexural strength showed a linear reduction as the DCPA:glass ratio increased, regardless of DCPA functionalization. Primarily, this effect can be ascribed to the reduction in glass content and its replacement by calcium phosphates, which have low cohesive strength 15 and, therefore, present no toughening effect 14 .…”

Section: Discussionsupporting

confidence: 85%

“…However, the replacement of glass particles by DCPA reduced the flexural modulus values only for formulations containing 40% or 50% of DCPA‐NF and 50% of DCPA‐F. This can be explained by the fact that the flexural modulus is related to the inter‐particle spacing 16 . The increase in DCPA content (with larger size than barium glass particles) resulted in higher inter‐particle spacing, allowing greater elastic deformation of the resin matrix 25 and consequently, reducing the flexural modulus.…”

Section: Discussionmentioning

confidence: 97%

“…This can be explained by the fact that the flexural modulus is related to the interparticle spacing. 16 The increase in DCPA content (with larger size than barium glass particles) resulted in higher inter-particle spacing, allowing greater elastic deformation of the resin matrix 25 and consequently, reducing the flexural modulus. It is interesting to notice that even considering the higher proportion of resin matrix in resin based composites containing DCPA-F in relation to materials with the same DCPA:…”

Section: Biaxial Flexural Strength and Modulusmentioning

confidence: 99%

“…14 Additionally, CaPs have low cohesive strength 15 and, therefore, do not exert a significant toughening effect. In a recent study, increasing the ratio between DCPD and silanized glass in a composite with a total inorganic content of 50 vol % led to a linear reduction in flexural strength, 16 evidencing the importance of the "CaP:glass" ratio in order to balance mechanical performance and remineralizing potential.…”

mentioning

confidence: 93%

“…Therefore, depending on the mass percentage of functionalizing monomer incorporated on the particle surface, the actual CaP content in the composite (i.e., the total particle volume/mass minus the volume/mass occupied by the monomer) can be significantly lower than its nominal content. As the detrimental effect of the addition of CaP on the mechanical properties (e.g., strength and fracture toughness) of the composite is directly related to its volumetric fraction, 14,16 it remains unclear whether the better mechanical performance of resin based composites containing functionalized particles is due to functionalization (i.e., a stronger particle-matrix interaction) or simply due to the lower actual CaP content in the material.…”

mentioning

confidence: 99%

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Influence of the calcium orthophosphate:glass ratio and calcium orthophosphate functionalization on the degree of conversion and mechanical properties of resin‐based composites

et al. 2022

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The study verified the influence of calcium orthophosphate (CaP):glass ratio on the degree of conversion and mechanical properties of resin‐based composites containing either TEGDMA‐functionalized dicalcium phosphate anhydrous (DCPA) or non‐functionalized DCPA particles. The null hypotheses were that the evaluated variables are not affected by (1) CaP:glass ratio or (2) DCPA functionalization. DCPA particles were synthesized and half of them were functionalized with TEGDMA. Particle characterization included x‐ray diffraction, elemental analysis, laser scattering, helium picnometry and scanning electron microscopy. Two series of composites were prepared containing either DCPA‐NF (non‐functionalized) or DCPA‐F (functionalized), with total inorganic content of 50 vol % and DCPA:silanized barium glass (BG) ratios from 10:40 to 50:0. A composite containing 50 vol % BG was tested as control. DC was determined using FTIR spectroscopy. Biaxial flexural strength and modulus were tested after 24 h in water. Data were analyzed using Kruskal–Wallis/Dunn (flexural properties) or analysis of variance/Tukey tests (DC). Materials with similar actual DCPA contents were compared using Student's t test (alpha: 0.05). DC was higher for materials with DCPA‐F, except for the 10:40 ratio. DCPA‐F resulted in higher strength than DCPA‐NF only at 40:10 ratio. Modulus was not affected by functionalization. Materials with similar actual DCPA contents showed differences in DC (F > NF), while no difference in flexural properties was observed between materials with 28%–30% DCPA. Both null hypotheses were rejected.

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Section: Discussionsupporting

confidence: 85%

Section: Discussionmentioning

confidence: 97%

Section: Biaxial Flexural Strength and Modulusmentioning

confidence: 99%

mentioning

confidence: 93%

mentioning

confidence: 99%

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Influence of the calcium orthophosphate:glass ratio and calcium orthophosphate functionalization on the degree of conversion and mechanical properties of resin‐based composites

et al. 2022

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Effect of Temperature and pH on Calcium Phosphate Precipitation

Vilela

Rodrigues

Fronza

et al. 2021

Crystal Research and Technology

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Calcium orthophosphates (CaP) synthesis involves several chemical equilibria that define the phases present in the final product. From the biomaterials standpoint, it is important to gain knowledge on how synthesis parameters affect phase formation and particle size. This study evaluates the interaction between temperature (24 or 45 °C) and pH conditions (4.5, 6.5, or drifting) on CaP precipitation in terms of yield, phase formation, density, morphology, and size distribution. Calcium and phosphate solutions (Ca/P = 1.0) are mixed and kept under stirring for 3 h. The precipitate is freeze-dried and characterized. Under drifting pH and pH 4.5, dicalcium phosphate dihydrate (DCPD, CaHPO 4 × 2H 2 O) is the predominant phase at both temperatures; however, some samples also present peaks ascribed to dicalcium phosphate anhydrous (DCPA, CaHPO 4 ). At pH 6.5, diffractograms reveal a mixture of low-crystallinity DCPD and DCPA (24 °C) or low crystallinity hydroxyapatite [HAP, Ca 10 (OH) 2 (PO 4 ) 6 ] (45 °C). In spite of the different morphologies (plates or aggregates), particle size remains within a relatively narrow range (D 50 = 12-28 µm). DCPD precipitation is favored under more acidic or drifting pH, while HAP is formed under nearly neutral pH 6.5.

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Functional fillers for dental resin composites

Wang

Zhu

2021

Acta Biomaterialia

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Effect of calcium orthophosphate: Reinforcing glass ratio and prolonged water storage on flexural properties of remineralizing composites

Cited by 11 publications

References 35 publications

Influence of the calcium orthophosphate:glass ratio and calcium orthophosphate functionalization on the degree of conversion and mechanical properties of resin‐based composites

Influence of the calcium orthophosphate:glass ratio and calcium orthophosphate functionalization on the degree of conversion and mechanical properties of resin‐based composites

Effect of Temperature and pH on Calcium Phosphate Precipitation

Functional fillers for dental resin composites

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