title: Application of reference point indentation for micro-mechanical surface characterization of calcium silicate based dental materials.
abstract: The objective of this study was to elucidate micromechanical properties of Biodentine and two experimental calcium silicate cements (CSCs) using Reference Point Indentation (RPI). Biomechanical characteristics of the cement type and the effects of a radiopacifier, liquid components, acid etching treatment and bioactivation in simulated body fluid (SBF) were investigated by measuring the microhardness, average unloading slope (Avg US) and indentation distance increase (IDI). Biodentine had a greater microhardness than the experimental CSCs, while the Avg US and IDI values were not significantly different among investigated materials. There was a statistically significant difference in microhardness and IDI values between pure CSCs and radiopacified cements (p < 0.05). Micromechanical properties were not affected by different liquid components used. Acid-etching treatment reduced Biodentine's microhardness while cements' immersion in SBF resulted in greater microhardness and higher IDI values compared to the control group. Clearly, the physiological environment and the cements' composition affect their surface micromechanical properties. The addition of calcium chloride and CSCs' immersion in SBF are beneficial for CSCs' micromechanical performance, while the addition of radiopacifiers and acid etching treatment weaken the CSCs' surface. Application of RPI aids with the characterization of micromechanical properties of synthetic materials' surfaces.
authors.affiliation: Laboratory of Anthropology, Institute of Anatomy, Faculty of Medicine, University of Belgrade, Dr. Subotića 4/2, 11000, Belgrade, Serbia.|Department of Osteology and Biomechanics, University Medical Center Hamburg-Eppendorf, Hamburg, Germany.
authors.forename: Djordje
authors.identifier: http://orcid.org/0000-0002-2566-4343
authors.initials: D
authors.lastname: Antonijević
authors.affiliation: Laboratory of Anthropology, Institute of Anatomy, Faculty of Medicine, University of Belgrade, Dr. Subotića 4/2, 11000, Belgrade, Serbia.
authors.forename: Petar
authors.initials: P
authors.lastname: Milovanović
authors.affiliation: Department of Osteology and Biomechanics, University Medical Center Hamburg-Eppendorf, Hamburg, Germany.
authors.forename: Christoph
authors.initials: C
authors.lastname: Riedel
authors.affiliation: Department of Osteology and Biomechanics, University Medical Center Hamburg-Eppendorf, Hamburg, Germany.
authors.forename: Michael
authors.initials: M
authors.lastname: Hahn
authors.affiliation: Department of Osteology and Biomechanics, University Medical Center Hamburg-Eppendorf, Hamburg, Germany.
authors.forename: Michael
authors.initials: M
authors.lastname: Amling
authors.affiliation: Department of Osteology and Biomechanics, University Medical Center Hamburg-Eppendorf, Hamburg, Germany.
authors.forename: Björn
authors.initials: B
authors.lastname: Busse
authors.affiliation: Laboratory of Anthropology, Institute of Anatomy, Faculty of Medicine, University of Belgrade, Dr. Subotića 4/2, 11000, Belgrade, Serbia. marijadjuric5@gmail.com.
authors.forename: Marija
authors.initials: M
authors.lastname: Djurić
mesh_terms: D017610:Calcium Compounds; D003764:Dental Materials; D008422:Materials Testing / Q000379:methods*; D055595:Mechanical Phenomena; D055616:Microtechnology / Q000379:methods*; D017640:Silicates; D013499:Surface Properties
chemical_list: D017610:Calcium Compounds; D003764:Dental Materials; D017640:Silicates; C031293:calcium silicate
keywords: Biodentine; Calcium silicate; Portland cement; Reference point indentation