Effect of the photoinitiator system on the properties of a dental material based on a hybrid polymer

Authors

  • Sandro Aurélio de Souza Venter Chemistry Department - UTFPR - Universidade Tecnológica Federal do Paraná, Apucarana - PR, Brasil.
  • Gedalias Custódio Martim Chemistry Department - UEM - Universidade Estadual de Maringá, Maringá - PR, Brasil.
  • Andressa dos Santos Chemistry Department - UEM - Universidade Estadual de Maringá, Maringá - PR, Brasil.
  • Tiago Roerto Detomini Chemistry Department - UEM - Universidade Estadual de Maringá, Maringá - PR, Brasil.
  • Eduardo Radovanovic Chemistry Department - UEM - Universidade Estadual de Maringá, Maringá - PR, Brasil.
  • Emerson Marcelo Girotto Chemistry Department - UEM - Universidade Estadual de Maringá, Maringá - PR, Brasil.

DOI:

https://doi.org/10.14295/bds.2016.v19i1.1233

Abstract

Objective: In this study, the effects of two different cure protocols upon the properties of composites using a hybrid-polymer as dental resin were evaluated. Material and Methods: Two distinct dental composites were prepared, one containing a mixture of TEGDMA/bis-GMA (50:50) and, another containing a mixture of TEGDMA/p-MEMO (50:50), [p-MEMO: oligomeric inorganic precursor]. Both composites were polymerized with lucirin and canphorquinone as photoinitiators. The composites were made with a 70 % wt of inorganic filler. Flexural strength was evaluated with a universal test machine and the degree of conversion was measured by infrared spectroscopy. A helium pycnometer was used to obtain polymer shrinkage data. Sorption tests were performed and SEM microscopy was used to show deleterious effects upon the resins’ surfaces. Results: The sample base on TEGDMA/p-MEMO polymerized with lucirin (L-T/p) showed the best values of the monitored properties. Conclusion: Lucirin is the most suitable photoinitiator for dental composites containing hybrid polymers.

Keywords

Dental resins; Flexural strength; Hybrid polymer; Photoinitiator system; Polymerization shrinkage.

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Published

2016-03-14

Issue

Section

Clinical or Laboratorial Research