By a News Reporter-Staff News Editor at Health & Medicine Week -- Investigators discuss new findings in Dentistry. According to news reporting originating from Oporto, Portugal, by NewsRx correspondents, research stated, "In dental restoration postoperative marginal leakage is commonly associated to polymerization shrinkage effects. In consequence the longevity and quality of restorative treatment depends on the shrinkage mechanisms of the composite filling during the polymerization."
Our news editors obtained a quote from the research from the University of Porto, "In this work the development of new techniques for evaluation of those effects under light-induced polymerization of dental nano composite fillings is reported. The composite resins activated by visible light, initiate the polymerization process by absorbing light in wavelengths at about 470 nm. The techniques employed in the contraction assessment were digital holography (DH) and Electronic Speckle Pattern Interferometry (ESPI) based on laser interferometry. A satisfactory resolution was achieved in the non-contact displacement field measurements on small objects concerning the experimental dental samples. According to a specific clinical protocol, natural teeth were used (human mandibular premolars). A class I cavity was drilled and restored with nano composite material, according to Black principles. The polymerization was monitored by DH and ESPI in real time during the cure reaction of the restoration. The total displacement reported for the material in relation of the tooth wall was 3.7 mu m (natural tooth)."
According to the news editors, the research concluded: "The technique showed the entire tooth surface (wall) deforming during polymerization shrinkage."
For more information on this research see: DH and ESPI laser interferometry applied to the restoration shrinkage assessment. Radiation Physics and Chemistry, 2014;94():190-193. Radiation Physics and Chemistry can be contacted at: Pergamon-Elsevier Science Ltd, The Boulevard, Langford Lane, Kidlington, Oxford OX5 1GB, England. (Elsevier - www.elsevier.com; Radiation Physics and Chemistry - www.elsevier.com/wps/product/cws_home/331)
The news editors report that additional information may be obtained by contacting L.M.P. Campos, University of Porto, Fac Engn, P-4200465 Oporto, Portugal. Additional authors for this research include D.F. Parra, M.R. Vasconcelos, M. Vaz and J. Monteiro (see also Dentistry).
Keywords for this news article include: Oporto, Europe, Portugal, Dentistry
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