Chemical Structure and Physical Properties of Heat-cured Poly(methyl methacrylate) Resin Processed with Cycloaliphatic Comonomer: An In Vitro Study

JOURNAL TITLE: The Journal of Contemporary Dental Practice

Author
1. Ramajayam Sasikala
2. Veerakumar Vignesh
3. Sekaran Sajidabegum
4. Dharanividhya Bhuvaneshkumar
5. Ranganthan Ajay
6. Karthigeyan Suma
ISSN
DOI
10.5005/jp-journals-10024-2769
Volume
21
Issue
3
Publishing Year
2020
Pages
5
Author Affiliations
1. com.mps.common.model.Contributor@6ce80bf4 ,
2. com.mps.common.model.Contributor@5fef57eb ,
3. com.mps.common.model.Contributor@7a57933b ,
4. com.mps.common.model.Contributor@351dca55 ,
5. com.mps.common.model.Contributor@1906c0a9 ,
6. com.mps.common.model.Contributor@3cf39c6d
Article keywords
Comonomer, Copolymer, Degree of conversion, Glass transition temperature, Tricyclodecane dimethanol diacrylate

Abstract

Aim: The purpose of this in vitro research is to chemically characterize polymethyl methacrylate (PMMA) processed with 10% and 20% (v/v) tricyclodecane dimethanol diacrylate (TCDDMDA) comonomer. It also aimed to assess the degree of conversion (DC) and glass transition temperature (Tg) of the formed copolymers. Materials and methods: The experimental groups were processed with the TCDDMDA comonomer (10% and 20% v/v), whereas the control group was processed only with the methyl methacrylate monomer. The copolymerization was studied by nuclear magnetic resonance (NMR) spectroscopy. The surface characteristics and composition (wt%) were studied by field-emission scanning electron microscopy (FESEM) and energy dispersive X-ray (EDX) spectroscopy (cuboidal specimen; 5 mm × 5 mm × 3 mm), respectively. The DC and Tg of the formed copolymers powdered form) were analyzed by Fourier transform infrared spectroscopy and differential scanning calorimetry, respectively. One-way analysis of variance with post hoc Bonferroni test was used to compare the mean values of DC% and Tg among the groups. Results: The newly formed copolymer [P(MMA-co-TCDDMDA)] was chemically characterized by NMR and FESEM-EDX. The DC and Tg of the experimental groups were higher than the control. Tricyclodecane dimethanol diacrylate at 20% (v/v) concentration showed the highest DC and Tg. Conclusion: The addition of TCDDMDA comonomer improved the DC and Tg of the formed copolymer. Clinical significance: The P(MMA-co-TCDDMDA) copolymer is expected to improve the mechanical properties and biocompatibility of the denture base acrylic resin. This would result in improved denture quality and durability, thereby, imparting a better quality of life to the geriatric population.

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