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. 2016:2016:7134283.
doi: 10.1155/2016/7134283. Epub 2016 Apr 12.

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

Alexandra Vinagre  1 , João Ramos  1 , Sofia Alves  1 , Ana Messias  1 , Nélia Alberto  2 , Rogério Nogueira  2
Affiliations

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

Alexandra Vinagre et al. Int J Biomater. 2016.

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 (n = 10). 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 (α = 0.05) considering temperature as the covariate. A statistically significant correlation between cuspal deflection, time, and material was observed (p < 0.01). 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 (p = 0.015) 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.

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Figures

Figure 1
Figure 1
Schematic illustration of the shape and dimensions of the cavity (adapted from Palin et al. 2005 [5]).
Figure 2
Figure 2
Schematic overview of the experimental setup used to measure the setting cuspal deformation and the temperature variation.
Figure 3
Figure 3
Temperature variation induced by the LED light-curing unit.
Figure 4
Figure 4
Average temperature variation obtained during the light curing of the restorations with the SDR™ and Esthet•X® HD resins.
Figure 5
Figure 5
Average cuspal deformation induced by SDR™ and Esthet•X® HD resins during the 10 minutes of real-time monitoring.
See this image and copyright information in PMC

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