Effects of Magnesium Oxide(MgO) particles on the hardness, roughness, and SEM investigation of maxillofacial silicone elastomers: An in vitro study

Abstract

Purpose: This research aimed to evaluate how different concentrations of MgO filler particles influence on the hardness, surface roughness and SEM investigation of VerSiltal 50 silicone elastomeric materials that vulcanize at room temperature.

Material and methods Using different weight percentages of MgO powder, 60 samples were created (0%, 0.5%, and 1% by wt.). The analysis made use of thirty samples from each group. Tests for surface roughness and surface hardness were performed on two experimental groups that contained 0.5% and 1% weight of MgO filler. Descriptive statistics and analysis of variance with multiple comparison tests were used to evaluate the data, and significance was indicated by a P value < 0.05. Scanning electron microscopy was used to measure the surface topography (SEM). Energy dispersive X-ray spectroscopy (EDS) can be used to determine the distribution of Magnesium Oxide within the VST-50 silicone matrix.

Result: surface roughness and hardness increased as the percentage of MgO increased from 0.5 wt. % to 1 wt. %, compared with those in the control group. The Sem test showed a good dispersion of the micro fillers and incorporation within the polymeric matrix of silicone. It showed that there was a slight little agglomeration of micro filler as filler loading increased.

Conclusion: Compared to the control group, the means for surface roughness and hardness increased significantly in the 0.5 and 1 wt.%  MgO experimental groups.