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Characterization of the Physical–Mechanical Properties of Dental Resin Composites Reinforced With Novel Micro-Nano Hybrid Silica Particles: An Optimization Study Publisher



Najafi H1 ; Akbari B1 ; Najafi F2 ; Shahabi S3 ; Abrishamkar A4 ; Moztarzadeh F5 ; Yazdanpanah A5
Authors
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Authors Affiliations
  1. 1. Division of Biomedical Engineering, Department of Life Science Engineering, Faculty of New Sciences and Technologies, University of Tehran, Tehran, Iran
  2. 2. Department of Resin and Additives, Institute for Color Science and Technology, Tehran, Iran
  3. 3. Laser Research Center of Dentistry, Tehran University of Medical Science, Tehran, Iran
  4. 4. Mechanical Engineering Department, Coventry University, Coventry, United Kingdom
  5. 5. Biomaterials Group, Faculty of Biomedical Engineering (Center of Excellence), Amirkabir University of Technology, Tehran, Iran

Source: Journal of Macromolecular Science# Part A: Pure and Applied Chemistry Published:2018


Abstract

In the study, dental composites of color A2 using Bis-GMA/UDMA/TEGDMA resins (ratios 70/10/20), and silica filler (70%wt, 75%wt, and 80%wt) which is a hybrid of two silica types in nano and micro dimensions were made using two different photoinitiators namely BAPO and camphorquinone. The optimum photoinitiator was selected based on the mechanical tests results after which the composites were subjected to the following tests: FTIR to evaluate polymerization degree, microhardness test, UTM, and SEM micrographs were taken to analyze the surface fracture of samples. The results of photoinitiator selection (flexural strength test) is 36.54 MPa, 37.62 MPa, and 75.08 MPa for BAPO + camphorquinone, camphorquinone, and BAPO respectively. The results show that the BAPO photoinitiator exhibits better results over camphorquinone and also BAPO/camphorquinone initiator systems. Then after choosing the photoinitiator system composites with different filler contents show higher mechanical strength than existing dental composites. The results of the mechanical tests for the composites with different filler contents synthesized after initiator system selection were significantly higher than the values specified in ISO 4049:2009 (102 MPa over 80 MPa). FTIR results indicate that the degree of conversion in these composite is 25.41%, 37.68, and 40.94% for composites with different filler amounts. © 2019, © 2019 Taylor & Francis Group, LLC.
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