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Effect of oxygen inhibition on 3D printed dental resins: A systematic review
Victor de Melo-Soares1, Andréa Cândido Dos Reis2, Mariana Lima da Costa Valente2
1Master's student, Department of Dental Materials and Prosthodontics, Ribeirão Preto Dental School, University of São Paulo (USP), Ribeirão Preto, Brazil.
Statement Of Problem:
Polymerization under oxygen inhibition increases polymerization crosslinking by inhibiting the formation of peroxy radicals. A systematic review to understand the effects of this polymerization strategy on the properties of polymethyl methacrylate (PMMA) -based resins for additive manufacturing is lacking.
Purpose:
The purpose of this systematic review was to determine whether oxygen inhibition during the postpolymerization process influences the physical-mechanical properties of PMMA-based resins for 3D printing.
Material And Methods:
The systematic review was prepared in accordance with the Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) 2020 guidelines and was registered with the Open Science Framework (osf.io/y3u7g). The population, intervention, comparison, outcome, and study design (PICOS) were PMMA-based resins for additive manufacturing, oxygen inhibition polymerization, oxygen atmosphere polymerization, physical-mechanical properties, and in vitro studies. Two reviewers independently assessed the articles in 2 phases based on the eligibility criteria.
Results:
Initially, 1221 articles were found, of which 319 were excluded because of duplication. After reading the titles and abstracts based on the application of the eligibility criteria, 15 articles were selected for reading in full, and 11 were included in the systematic review. Most of the articles reported a significant improvement in the degree of conversion and in the physical and mechanical properties of PMMA-based resins for additive manufacturing.
Conclusions:
Oxygen inhibition favors postpolymerization by increasing the availability of free radicals for polymer conversion, which may be a suitable polymerization strategy in clinical practice. The higher degree of conversion achieved by polymerization under oxygen inhibition improves physical-mechanical properties and surface characteristics.
