Influence of inorganic composition and filler particle morphology on the mechanical properties of self-adhesive resin cements
Santi Marina Rodrigues, Lins Rodrigo Barros Esteves, Sahadi Beatriz Ometto, Denucci Giovanna Correa, Soffner Gabriela, Martins Luis Roberto Marcondes,
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( Santi Marina Rodrigues ) - State University of Campinas Piracicaba Dental School Department of Restorative Dentistry
( Lins Rodrigo Barros Esteves ) - State University of Campinas Piracicaba Dental School Department of Restorative Dentistry
( Sahadi Beatriz Ometto ) - State University of Campinas Piracicaba Dental School Department of Restorative Dentistry
( Denucci Giovanna Correa ) - Indiana University School of Dentistry Department of Cariology, Operative Dentistry and Dental Public Health
( Soffner Gabriela ) - State University of Campinas Piracicaba Dental School Department of Restorative Dentistry
( Martins Luis Roberto Marcondes ) - State University of Campinas Piracicaba Dental School Department of Restorative Dentistry
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.
키워드
Inorganic fillers; Mechanical properties; Morphology; Resin cements
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