Effects of Reinforcing Phase Systems Modified by Binding Agents on Properties of Dental Restorative Materials

A.B.H. Yoruç, A. Aydinoğlu
Yildiz Technical University,
Turkey

Keywords: Dental Restorative Composites, Polymers, Reinforcing phase, Bonding agents, Silica

Summary:

In this current study, mechanical and physical features of resin-based dental restorative materials were examined. These dental materials contained BisGMA, HEMA, UDMA, TEGDMA mixture as an organic matrix, silica or silica/silane nanoparticles as reinforcing phase systems. In dental composites, methacryloxy propyl trimethoxysilane (MPTS) was used as a silanizing agent. To determine compressive strength and depth of cure, composite samples were prepared by using Teflon mold. Before compressive and flexural tests, samples were left in distilled water for 14 days as it is recommended in the ISO 4049 standard. As a result of tests, it was determined that silane-based binder agents and modified reinforcing phase systems improved both mechanical and physical features of composites such as curing depth. It was determined that compressive strength, flexural strength and depth of cure of composites which contain silica and silica/silane reinforcing phase systems were respectively 157.6-195.4 MPa, 72.4 and 112.0 GPa, and >2.5 and >2.6 mm. It has been indicated that silane structures, which are used for the silanization of the reinforcing phase systems, have effects on mechanical and physical features of the composite. These effects occur as a result of the organic matrix-phase interface supporting bonding formed by silane structures.