Cuspal Displacement Induced by Bulk Fill Resin Composite Polymerization: Biomechanical Evaluation Using Fiber Bragg Grating SensorsReportar como inadecuado




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International Journal of Biomaterials - Volume 2016 2016, Article ID 7134283, 9 pages -

Research Article

Faculty of Medicine, University of Coimbra, Avenida Bissaya Barreto, Blocos de Celas, 3000-075 Coimbra, Portugal

Instituto de Telecomunicações IT, Campus Universitário de Santiago, 3810-193 Aveiro, Portugal

Received 26 November 2015; Revised 18 March 2016; Accepted 21 March 2016

Academic Editor: Feng-Huei Lin

Copyright © 2016 Alexandra Vinagre et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Polymerization shrinkage is a major concern to the clinical success of direct composite resin restorations. The aim of this study was to compare the effect of polymerization shrinkage strain of two resin composites on cuspal movement based on the use of fiber Bragg grating FBG sensors. Twenty standardized Class II cavities prepared in upper third molars were allocated into two groups . Restorations involved the bulk fill placement of conventional microhybrid resin composite Esthet•X® HD, Dentsply DeTrey Group 1 or flowable -low-shrinkage- resin composite SDR™, Dentsply DeTrey Group 2. Two FBG sensors were used per restoration for real-time measurement of cuspal linear deformation and temperature variation. Group comparisons were determined using ANCOVA considering temperature as the covariate. A statistically significant correlation between cuspal deflection, time, and material was observed . Cuspal deflection reached 8.8 μm 0.23 and 7.8 μm 0.20 in Groups 1 and 2, respectively. When used with bulk fill technique, flowable resin composite SDR™ induced significantly less cuspal deflection than the conventional resin composite Esthet•X® HD and presented a smoother curve slope during the polymerization. FBG sensors appear to be a valid tool for accurate real-time monitoring of cuspal deformation.





Autor: Alexandra Vinagre, João Ramos, Sofia Alves, Ana Messias, Nélia Alberto, and Rogério Nogueira

Fuente: https://www.hindawi.com/



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