Polymerization shrinkage of composite resins: Comparison with tooth deformation

Polymerization profile analysis of resin composite dental restorative materials in real time

“…5,6 Composite polymerization shrinkage potentially leads to cuspal strain and enamel micro crack propagation when resin contraction does not sever the resin-tooth adhesion generated through bonding procedures. [7][8][9] Should the accumulated polymerization contraction stress result in toothcomposite adhesive failure, bacterial aggregation at the disrupted tooth-restoration margin can occur, 10,11 resulting in leakage and later recurrent caries. [10][11][12] Defective proximal contacts occurring as a result of composite polymerization shrinkage may also contribute to recurrent caries occurrence; defective contacts facilitating bacterial and food accumulation at proximal margins.…”

The Restorative Use of Fibre-Reinforced Materials in the Posterior Region

“…The latter observation is in accordance with studies showing that the magnitude of the cuspal deflection was not significantly different when different layering techniques were used [45,46]. In spite of the fact that many studies recommend oblique layering in order to avoid or delay the bonding together of opposing cusps, thereby reducing the stress levels within the restoration and at the toothcomposite interface [47,48], it is still not yet clear which of the incremental techniques is the most appropriate.…”

Comparison of two video-imaging instruments for measuring volumetric shrinkage of dental resin composites

“…It is important, therefore, that straightforward and simple methods be found to accurately measure resin composite polymerization shrinkage. Several methods have been used, such as: mercury dilatometry; 13-15 water dilatometry; [16][17][18][19] strain gauge, 20 linear contraction, 21,22 and density measurements; 7,23 and video imaging. 3,24 A simple and easy method has recently been developed to measure volumetric shrinkage of resins using video imaging (AcuVol, Bisco, Schaumburg, IL, USA).…”