The Mechanical Properties of a Poly(methyl methacrylate) Denture Base Material Modified with Dimethyl Itaconate and Di-n-butyl Itaconate

Pavle Spasojevic,Sava Velickovic,Vesna Panic,Dragoslav Stamenkovic,Milorad Zrilic,Sanja Seslija

doi:10.1155/2015/561012

Pavle Spasojevic, Sava Velickovic + Show 4 more

Open Access

https://doi.org/10.1155/2015/561012

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Abstract

This study investigates a wide range of clinically relevant mechanical properties of poly(methyl methacrylate) (PMMA) denture base materials modified with di-methyl itaconate (DMI) and di-n-butyl itaconate (DBI) in order to compare them to a commercial PMMA denture base material. The commercial denture base formulation was modified with DMI and DBI by replacing up to 10 wt% of methyl methacrylate (MMA) monomer. The specimens were prepared by standard bath curing process. The influence of the itaconate content on hardness, impact strength, tensile, and thermal and dynamic mechanical properties was investigated. It is found that the addition of di-n-alkyl itaconates gives homogenous blends that show decreased glass transition temperature, as well as decrease in storage modulus, ultimate tensile strength, and impact fracture resistance with increase in the itaconate content. The mean values of surface hardness show no significant change with the addition of itaconates. The magnitude of the measured values indicates that the poly(methyl methacrylate) (PMMA) denture base material modified with itaconates could be developed into a less toxic, more environmentally and patient friendly product than commercial pure PMMA denture base material.

Highlights

One of the most important unmodified acrylic materials for dental applications is poly(methyl methacrylate) (PMMA)
Taken that it is the lesser toxicity and the “greener” properties of the material that are important for the enhanced qualities of denture base, in this paper we investigated the mechanical properties of commercial denture base material modified with dimethyl itaconate (DMI) and di-n-butyl itaconate (DBI)
The synthesized samples of PMMA denture base materials modified with di-methyl itaconate (DMI) and DBI, as well as the homopolymers of PMMA, poly(dimethyl itaconate) (PDMI), and poly(di-n-butyl itaconate) (PDBI), were characterized by Fourier Transform Infrared Spectroscopy (FTIR) analysis

Summary

Introduction

One of the most important unmodified acrylic materials for dental applications is poly(methyl methacrylate) (PMMA). PMMA denture base materials have a lot of qualities, they are often subject to intense criticism because of their inherent drawbacks such as residual monomer toxicity and its effect on the oral tissues (Figure 1) [11,12,13,14,15], mechanical properties that are not always perfect [16], and susceptibility to distortion. In order to overcome the drawbacks of pure PMMA denture base material we have investigated the possibility of modifying the commercial formulations with the derivatives of itaconic acid. In our previous study we have investigated water sorption and residual monomer content in the PMMA denture base materials modified with DMI and DBI [40]. As residual MMA has been recognized as the main cause of allergic sensitization, contact dermatitis, and tissue inflammation, its reduction significantly improved the applicative properties and biocompatibility of the PMMA denture base material. Taken that it is the lesser toxicity and the “greener” properties of the material that are important for the enhanced qualities of denture base, in this paper we investigated the mechanical properties of commercial denture base material modified with dimethyl itaconate (DMI) and di-n-butyl itaconate (DBI)

Experimental

Results and Discussion

DBI 10 DBI

Conclusions