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      Polymerisation Shrinkage Profiling of Dental Composites using Optical Fibre Sensing and their Correlation with Degree of Conversion and Curing Rate

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          Abstract

          Traditional polymerisation shrinkage (PS) measurement systems measure average PS of dental composites, but the true local PS varies along the length and breadth of the composite. The PS depends on the curing light intensity distribution, resultant degree of conversion (DOC) and the curing rate. In this paper, optical fibre Bragg grating (FBG) sensing based technology is used to measure the linear post-gel PS at multiple locations within dental composite specimens, and is correlated with DOC and curing rate. A commercial dental composite is used, and its post-gel PS and DOC are mapped using embedded fibre Bragg grating sensors at different curing conditions. The distance between the curing lamp and the composite specimen is varied which resulted in different intensity distribution across the specimen. The effect of curing light intensity distribution on PS, curing rate and DOC are investigated for demonstrating a relationship among them. It is demonstrated that FBG sensing method is an effective method to accurately profiling post-gel PS across the specimen.

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          In-fibre Bragg grating sensors

          Yun-Jiang Rao (1997)
          Article 0 comments Cited 184 times – based on 0 reviews     Review now
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            Factors involved in the development of polymerization shrinkage stress in resin-composites: a systematic review.

            Juarez R. Braga, Leomar Ballester, Jack Ferracane (2005)
            Polymerization shrinkage stress of resin-composite materials may have a negative impact on the clinical performance of bonded restorations. The purpose of this systematic review is to discuss the primary factors involved with polymerization shrinkage stress development. According to the current literature, polymerization stress of resin composites is determined by their volumetric shrinkage, viscoelastic behavior and by restrictions imposed to polymerization shrinkage. Therefore, the material's composition, its degree of conversion and reaction kinetics become aspects of interest, together with the confinement and compliance of the cavity preparation. Information provided in this review was based on original scientific research published in Dental, Chemistry and Biomaterials journals. Textbooks on Chemistry and Dental Materials were also referenced for basic concepts. Shrinkage stress development must be considered a multi-factorial phenomenon. Therefore, accessing the specific contribution of volumetric shrinkage, viscoelastic behavior, reaction kinetics and local conditions on stress magnitude seems impractical. Some of the restorative techniques aiming at stress reduction have limited applicability, because their efficiency varies depending upon the materials employed. Due to an intense research activity over the years, the understanding of this matter has increased remarkably, leading to the development of new restorative techniques and materials that may help minimize this problem.
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              Light curing in dentistry and clinical implications: a literature review

              Frederick Rueggeberg, Marcelo Giannini, Cesar Augusto Galvão ARRAIS … (2017)
              Abstract Contemporary dentistry literally cannot be performed without use of resin-based restorative materials. With the success of bonding resin materials to tooth structures, an even wider scope of clinical applications has arisen for these lines of products. Understanding of the basic events occurring in any dental polymerization mechanism, regardless of the mode of activating the process, will allow clinicians to both better appreciate the tremendous improvements that have been made over the years, and will also provide valuable information on differences among strategies manufacturers use to optimize product performance, as well as factors under the control of the clinician, whereby they can influence the long-term outcome of their restorative procedures.
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                Author and article information

                Contributors
                Ginu Rajan: ginu@uow.edu.au
                Journal
                Journal ID (nlm-ta): Sci Rep
                Journal ID (iso-abbrev): Sci Rep
                Title: Scientific Reports
                Publisher: Nature Publishing Group UK (London )
                ISSN (Electronic): 2045-2322
                Publication date (Electronic): 28 February 2019
                Publication date PMC-release: 28 February 2019
                Publication date Collection: 2019
                Volume: 9
                Electronic Location Identifier: 3162
                Affiliations
                [1 ]ISNI 0000 0004 0486 528X, GRID grid.1007.6, School of Electrical, Computer and Telecommunications Engineering, , University of Wollongong, ; Wollongong, Australia
                [2 ]ISNI 0000 0004 4902 0432, GRID grid.1005.4, School of Mechanical and Manufacturing Engineering, , UNSW Sydney, ; Sydney, Australia
                [3 ]SDI Ltd, Bayswater, Victoria, Australia
                Article
                Publisher ID: 40162
                DOI: 10.1038/s41598-019-40162-z
                PMC ID: 6395615
                PubMed ID: 30816275
                SO-VID: 6e392a2a-29d9-421a-84bc-ec4a70399560
                Copyright © © The Author(s) 2019
                License:

                Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

                History
                Date received : 5 June 2018
                Date accepted : 8 February 2019
                Funding
                Funded by: FundRef https://doi.org/10.13039/501100000923, Department of Education and Training | Australian Research Council (ARC);
                Award ID: LP160100260
                Award ID: LP160100260
                Award ID: LP160100260
                Award Recipient :
                Categories
                Subject: Article
                Custom metadata
                issue-copyright-statement © The Author(s) 2019

                ScienceOpen disciplines: Uncategorized
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