Restor Dent Endod.  2022 Aug;47(3):e32. 10.5395/rde.2022.47.e32.

Influence of inorganic composition and filler particle morphology on the mechanical properties of selfadhesive resin cements

• Santi MR
• Lins RBE
• Sahadi BO
• Denucci GC
• Soffner G
• Martins LRM

• KMID: 2548136
• DOI: http://doi.org/10.5395/rde.2022.47.e32

Abstract

Objectives
This study aimed to evaluate the influence of inorganic composition and filler particle morphology on the mechanical properties of different self-adhesive resin cements (SARCs).
Materials and Methods
Three SARCs including RelyX Unicem-2 (RUN), Maxcem Elite (MAX), and Calibra Universal (CAL) were tested. Rectangular bar-shaped specimens were prepared for flexural strength (FS) and flexural modulus (FM) and determined by a 3-point bending test. The Knoop microhardness (KHN) and top/bottom microhardness ratio (%KHN) were conducted on the top and bottom faces of disc-shaped samples. Sorption (Wsp) and solubility (Wsl) were evaluated after 24 hours of water immersion. Filler morphology was analyzed by scanning electron microscopy and X-ray energy dispersive spectroscopy (EDS). FS, FM, %KHN, Wsp, Wsl, and EDS results were submitted to 1-way analysis of variance and Tukey’s post-hoc test, and KHN also to paired t-test (α = 0.05).
Results
SARC-CAL presented the highest FS value, and SARC-RUN presented the highest FM. SARC-MAX and RUN showed the lowest Wsp and Wsl values. KHN values decreased from top to bottom and the SARCs did not differ statistically. Also, all resin cements presented carbon, aluminum, and silica in their composition. SARC-MAX and RUN showed irregular and splintered particles while CAL presented small and regular size particles.
Conclusions
A higher mechanical strength can be achieved by a reduced spread in grit size and the filler morphology can influence the KHN, as well as photoinitiators in the composition. Wsp and Wsl can be correlated with ions diffusion of inorganic particles.

Keyword

Inorganic fillers; Mechanical properties; Morphology; Resin cements

Figure

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  Figure 1 Schematic representation of microhardness indentations.

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  Figure 2 (A) Knoop Microhardness of the evaluated SARCs; (B) Knoop microhardness top/bottom ratio.Mean values and standard deviation represented with different letters are significantly different at 5%, according to paired t-test. Lowercase letters compare top and bottom for each resin cement.

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  Figure 3 Mean values and standard deviation of sorption (A) and solubility (B) characteristics after 24 hours immersion in distilled water. Lowercase letters compare the resin cements.

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  Figure 4 Energy dispersive X-ray analysis charts showing the elemental composition of filler particles (A), and scanning electron micrographs of filler particles at ×1,200 (B) and ×3,000 (C) magnifications.C, Carbon; Zn, Zinc; La, Lanthanum; Al, Aluminum; Ba, Barium; O, Oxygen; Na, Sodium; Si, Silica.

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