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VOLUME 22 , ISSUE 6 ( June, 2021 ) > List of Articles

ORIGINAL RESEARCH

Chemical Characterization and Physical Properties of Dental Restorative Composite Resin with a Novel Multifunctional Cross-linking Comonomer

Jambai Sampathkumar Sivakumar, Venkatesan Sudhakar, Chandramohan Ravivarman, Sundaravadivel Vignesh, Shafie Ahamed

Keywords : Copolymer, Cross-linker, Degree of conversion, Dipentaerythritol penta-/hexaacrylate, Glass transition temperature

Citation Information : Sivakumar JS, Sudhakar V, Ravivarman C, Vignesh S, Ahamed S. Chemical Characterization and Physical Properties of Dental Restorative Composite Resin with a Novel Multifunctional Cross-linking Comonomer. J Contemp Dent Pract 2021; 22 (6):630-636.

DOI: 10.5005/jp-journals-10024-3090

License: CC BY-NC 4.0

Published Online: 09-08-2021

Copyright Statement:  Copyright © 2021; The Author(s).


Abstract

Aim and objective: To chemically characterize restorative composite resin polymerized with 20 wt.% and 40 wt.% dipentaerythritol penta-/hexaacrylate (DPEPHA) comonomer. Furthermore, this study aimed to evaluate the conversion degree (DC) and glass transition temperature (Tg) of the newly formed copolymer. Materials and methods: The trial groups were photo-polymerized with DPEPHA comonomer, whereas the control group was photo-polymerized only with the propriety resin monomers. Infrared (FTIR) and nuclear magnetic resonance (NMR) spectroscopies were used for establishing copolymerization. The characteristics and composition (mass %) of the surface were explained by field-emission scanning electron microscopy (FESEM) and energy-dispersive X-ray (EDX) spectroscopy, respectively. The DC and Tg of the resultant copolymers were evaluated through FTIR and differential scanning calorimetry, respectively. Appropriate statistical tests with corresponding post hoc tests were employed to compare the medians and means of DC and Tg, respectively. Results: The formation of a new copolymer P(GEU-Co-DPEPHA) was evident. The DC and Tg of the P(GEU-Co-DPEPHA) copolymer were greater than the control. DPEPHA in the copolymer at 40 wt.% concentration showed the highest DC and Tg. Conclusion: DPEPHA comonomer addition leads to the formation of a new P(GEU-Co-DPEPHA) copolymer with improved DC and Tg. Clinical significance: The novel P(GEU-Co-DPEPHA) copolymer may improve the physico-mechanical and biological properties of the restorative composite resin. This would improve the quality of restoration and its in vivo serviceability, thereby imparting a good living quality to the entailed population.


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