EVALUATION OF THE MECHANICAL BEHAVIOR OF G-AENIAL RESTORATIVE COMPOSITES USING MULTI-CYCLING INDENTATION

Adriana-Madalina TURCANU (CONSTANTINESCU), Felicia STAN, Catalin FETECAU

Abstract


During the mastication process, the restorative materials are exposed to dynamic loading as tooth cusps and hard foods cyclically indent these materials. In this work, the indentation technique is used to investigate the mechanical behavior of G-ænial under various multi-cycling nanoindentation conditions and to study the mechanical properties, such as elastic modulus and hardness. First, static indentation tests were performed to assess the effect of the holding time on the mechanical behavior of G-ænial. Then, a series of dynamic indentation tests were conducted in which the number of indentation cycles varied from 6 to 30. The experimental results indicated that both the static indentation hardness and elastic modulus decrease with increasing holding time from 0 s to 30 s. Moreover, the elastic modulus and indentation hardness of the G-ænial composite decreased with the increasing number of cycle loadings, indicating that the restorative composite becomes more susceptible to fatigue damage.

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