Chemical characterization of additively manufactured methacrylates for dental devices
File version
Accepted Manuscript (AM)
Author(s)
Alifui-Segbaya, Frank
Bowman, Jasper
White, Alan R
George, Roy
Fidan, Ismail
Love, Robert M
Year published
2020
Metadata
Show full item recordAbstract
Despite the potential benefits of photopolymerization-based additive manufacturing, photochemical reactions in free-radical polymerization rarely proceed to completion, leading to the accumulation of residual monomer in polymer networks. In this novel study, we examined an array of methacrylate polymers for denture bases (>60 % Bis-EMA and 15–25 % proprietary methacrylic oligomer), orthodontic appliances (>70 % proprietary methacrylic oligomer, <20 % glycol methacrylate and <5 % pentamethyl-piperidyl sebucate) and implant surgical guides (≥75 % Bis-EMA and 30–50 % diurethane dimethacrylate, mixture of isomers) using headspace ...
View more >Despite the potential benefits of photopolymerization-based additive manufacturing, photochemical reactions in free-radical polymerization rarely proceed to completion, leading to the accumulation of residual monomer in polymer networks. In this novel study, we examined an array of methacrylate polymers for denture bases (>60 % Bis-EMA and 15–25 % proprietary methacrylic oligomer), orthodontic appliances (>70 % proprietary methacrylic oligomer, <20 % glycol methacrylate and <5 % pentamethyl-piperidyl sebucate) and implant surgical guides (≥75 % Bis-EMA and 30–50 % diurethane dimethacrylate, mixture of isomers) using headspace gas chromatography-mass spectrometry. Experimental data reported herein show that a substantial proportion of chemical compounds observed in the methacrylates decreased with post-illumination and the applied ethanol treatment. In the absence of residual methyl methacrylate, other potentially toxic acrylic esters were observed thus emphasizing the need to thoroughly scrutinize additively manufactured dental devices prior to their use. In the long term, standards for medical devices in dentistry could be revised to reflect the current trends in biomaterials and precursors they are generated from.
View less >
View more >Despite the potential benefits of photopolymerization-based additive manufacturing, photochemical reactions in free-radical polymerization rarely proceed to completion, leading to the accumulation of residual monomer in polymer networks. In this novel study, we examined an array of methacrylate polymers for denture bases (>60 % Bis-EMA and 15–25 % proprietary methacrylic oligomer), orthodontic appliances (>70 % proprietary methacrylic oligomer, <20 % glycol methacrylate and <5 % pentamethyl-piperidyl sebucate) and implant surgical guides (≥75 % Bis-EMA and 30–50 % diurethane dimethacrylate, mixture of isomers) using headspace gas chromatography-mass spectrometry. Experimental data reported herein show that a substantial proportion of chemical compounds observed in the methacrylates decreased with post-illumination and the applied ethanol treatment. In the absence of residual methyl methacrylate, other potentially toxic acrylic esters were observed thus emphasizing the need to thoroughly scrutinize additively manufactured dental devices prior to their use. In the long term, standards for medical devices in dentistry could be revised to reflect the current trends in biomaterials and precursors they are generated from.
View less >
Journal Title
Additive Manufacturing
Copyright Statement
© 2019 Elsevier. Licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International Licence (http://creativecommons.org/licenses/by-nc-nd/4.0/) which permits unrestricted, non-commercial use, distribution and reproduction in any medium, providing that the work is properly cited.
Subject
Analytical chemistry
Dentistry
Materials engineering
Manufacturing engineering