Young’s modulus and Poisson ratio of composite materials: Influence of wet and dry storage

Abstract

In the oral environment dental materials are subject to a wet condition what might in time change their elastic properties. In this article, we evaluated the influence of the storage condition (dry versus wet) on the Young's modulus and the Poisson ratio in compression of three composite materials. The data of the Young's modulus and Poisson ratio published of dental composite materials are not always comparable, due to different test methods and sample dimensions influencing the results. Therefore, we established the degree of exactness of the results out of the test setup used. Since the present study depicted differences of the properties after dry and wet storage, the elastic properties should be measured after wet storage. The bonding between the matrix and the filler particles showed to have an influence on the elastic properties and on the influence of a wet environment.

Highly Reinforced Acrylic Resins for Hard Tissue Engineering and Their Suitability to Be Additively Manufactured through Nozzle-Based Photo-Printing

“…Stress vs. strain curves can be found in the Supplementary Files . The use of inorganic nanoparticles for increasing mechanical properties of restorative resins has gained great attention in the last decade, and compressive properties are of paramount importance because highly mineralized tissues in the oral cavity (i.e., dentin and bone) mainly undergo a compressive state of stress during mastication; crack initiation at restorative sites causes secondary caries [ 26 , 39 , 40 , 41 ].…”

“…A large inconsistency of Young’s modulus measured in compression for highly filled dental composites is reported in the literature [ 39 , 40 , 51 , 52 ]. Young’s modulus is defined as the ratio between the stress and strain in the initial linear static region, and the modality by which the strain is measured largely affects the estimation of Young’s modulus.…”

“…Young’s modulus is defined as the ratio between the stress and strain in the initial linear static region, and the modality by which the strain is measured largely affects the estimation of Young’s modulus. In fact, if the compressive strain is evaluated through the cross-head displacement of the dynamometer [ 39 , 40 ], significantly lower Young’s modulus values are assessed. Instead, if the strain is measured through local deformation sensors [ 41 ], then higher Young’s modulus values are estimated [ 42 , 51 ].…”

Experimental Investigations of the Dental Filling Materials: Establishing Elastic Moduli and Poisson’s Ratios

“…The authors of the reference [40,41] performed accurate experimental investigations on three types of nano-composites, widely used as DFMs, in order to verify the effects of the polymerization conditions on the Young's modulus' and the conversion degree's magnitudes.…”