Amorphous Macromers as Potential Organic Matrix in Dental Composites

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Published Aug 31, 2023
DOI: https://doi.org/10.18103/mra.v11i8.4254

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Main Article Content

Anand V. Susila
Senior Research Fellow, RBG Lab, ED, IITM, Chennai, India, 600036.; Present Address: Professor and Head, Conservative Dentistry & Endodontics, Madha Dental College (Affiliated to The Tamilnadu Dr. M.G.R Medical University), Chennai, India, 600069. Amorphous macromers as potential organic matrix in dental composites
Venkatesh Balasubramanian
Professor, ED, IITM, Chennai, India, 600036.

Abstract

Objectives: Assess the thermal and hydrolytic stability of patented macromer- based dental polymer matrices and composites


Methods: Polymer matrices and composites based on a patented material (IP:343192) containing hybrid amorphous macromers co-polymerized with one of the 4 different dimethacrylates was prepared and the thermal and photo-thermal behavior were assessed. Diffusivity resistance and cross-link density of polymers were assessed. Sorption (𝑆(𝑡), 𝑀𝑔%(𝑡) 𝖠 𝑆%(𝑡)and solubility (𝑆𝐿(𝑡) 𝖠 𝑆𝐿%(𝑡) of composites in chloroform (CHCl3), tetrahydrofuran (THF), carbon tetrachloride (CCL) and acetone (Ace) for varying durations (1h, 24h 1mo), and deionized water for 120h were determined.


Results: Dual Tg were noticed for both the matrices and composites; matrices containing BisGMA (G) and UDMA (U) as the dimethacrylate co-polymer showed significantly lower𝑆𝐿(𝑡). Matrix containing TEGDMA (T) as the dimethacrylate co-polymer showed the least 𝑆(𝑡). Matrix containing BisEMA (E) had the highest cross-link density. photo-DSC of composites showed a Degree of Conversion of 97% at lower enthalpies (15-28J/g). None of the composites showed water solubility. All materials showed solubility in acetone with U being the least. Sorption and solubility in other organic solvents was lower and occurred only at longer immersion time.


Conclusions: Amorphous hybrid macromer-based polymer matrices and composites show promising thermal and hydrolytic behavior.

Keywords: dental composite, macromer, thermal stability, glass transition, hydrolytic stability, cross-link density

Article Details

How to Cite
SUSILA, Anand V.; BALASUBRAMANIAN, Venkatesh. Amorphous Macromers as Potential Organic Matrix in Dental Composites. Medical Research Archives, [S.l.], v. 11, n. 8, aug. 2023. ISSN 2375-1924. Available at: <https://esmed.org/MRA/mra/article/view/4254>. Date accessed: 13 may 2024. doi: https://doi.org/10.18103/mra.v11i8.4254.
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Issue
Vol 11 No 8 (2023): August Issue, Vol.11, Issue 8
Section
Research Articles

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