A Novel Dental Polymer with a Flipped External Ester Group Design that Resists Degradation via Polymer Backbone Preservation

Dhiraj Kumar, Robert D. Bolskar, Sydney Malone, Isha Mutreja, Conrado Aparicio, Robert S. Jones

Research output: Contribution to journalArticlepeer-review

2 Scopus citations


Current dental sealants with methacrylate-based chemistry are prone to hydrolytic degradation. A conventional ethylene glycol dimethacrylate (EGDMA) was compared to a novel methacrylate monomer with a flipped external ester group (ethylene glycol ethyl methacrylate, EGEMA) that was designed to resist polymer degradation effects. Fourier transform infrared spectroscopy and water contact angle measurements confirmed a comparable degree of initial conversion and surface wettability for EGDMA and EGEMA. EGDMA disks initially performed better than EGEMA disks, as suggested by their higher surface hardness and 1.5 times higher diametral tensile strength (DTS). After 15 weeks of hydrolytic and accelerated aging, EGDMA and EGEMA DTS were reduced by 88 and 44%, respectively. This accelerated aging model resulted in 3.3 times higher water sorption for EDGMA disks than for EGEMA disks. EGDMA had an increase in grain boundary defects and visible erosion sites with accelerated aging, while for EGEMA, the changes were not significant.

Original languageEnglish (US)
Pages (from-to)5609-5619
Number of pages11
JournalACS Biomaterial Science and Engineering
Issue number10
StatePublished - Oct 12 2020

Bibliographical note

Funding Information:
Research reported in this publication was supported by the National Institute of Dental and Craniofacial Research of the National Institutes of Health (NIH) under award no. 1R44DE024013 to TDA Research. Parts of this work were carried out in the Characterization Facility, University of Minnesota, a member of the NSF - Funded Materials Research Facilities Network ( www.mrfn.org ) via the MRSEC program. The Hitachi SU8320 CryoSEM and Cryo-specimen preparation system were provided by the NSF MRI DMR-1229263 program. Authors would like to thank Young Heo and Dr. Hooi Pin Chew for allowing access and setting up the MTS system and OCT IVS 2000 system. The content is solely the responsibility of the authors and does not necessarily represent the official views of the NIH or NSF.

Publisher Copyright:
Copyright © 2020 American Chemical Society.


  • dental sealants
  • ethylene glycol dimethacrylate
  • hydrolytic degradation
  • polymer backbone preservation

PubMed: MeSH publication types

  • Journal Article
  • Research Support, U.S. Gov't, Non-P.H.S.
  • Research Support, N.I.H., Extramural


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