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Materials 2009, 2(1), 169-180; doi:10.3390/ma2010169

Polymerization Stress Development in Dental Composites: Effect of Cavity Design Factor

Polymers Division, National Institute of Standards and Technology, Gaithersburg, 20899, MD, USA
Paffenbarger Research Center, American Dental Association Foundation, Gaithersburg, 20899, MD, USA
Author to whom correspondence should be addressed.
Received: 3 January 2009 / Revised: 6 March 2009 / Accepted: 11 March 2009 / Published: 13 March 2009
(This article belongs to the Special Issue Biocompatibility of Materials)
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The objective of the study was to assess the effect of the cavity design factor (C-factor) on polymerization stress development (PSD) in resin composites. An experimental resin (BT resin) was prepared, which contained 2,2-bis[p-(2’-hydroxy-3’-methacryloxypropoxy)phenylene]propane (B) and triethylene glycol dimethacrylate (T) in 1:1 mass ratio, and an activator for visible light polymerization. An experimental composite with demonstrated remineralizing potential was also formulated by inclusion into the BT resin of zirconia-hybridized amorphous calcium phosphate (ACP) filler at a mass fraction of 40 % (BT/ACP composite). A commercial glass-filled composite (TPH) was used as a control. To assess the effect of the test geometry on PSD, C-factor was systematically varied between 0.8 and 6.0 by varying the height of the cylindrical composite specimens. The measured PSD values obtained by cantilever beam tensometry for specimens with variable C-factors were normalized for mass to specimens with a C-factor of 1.33 (h=2.25 mm) as controls to give calculated PSD values. Degrees of vinyl conversions (DC) attained in the TPH control and in the experimental BT/ACP composites were measured by near-infrared spectroscopy. In both the TPH and BT/ACP composite series, PSDcalc increased with the increasing C-factor, confirming the hypothesis that the C-factor value influences PSD values. The higher PSDmeas and PSDcalc values for the experimental BT/ACP composite compared to the commercial TPH composite probably reflect differences in the type and mass of the resin and filler phases in the two types of composite. These differences also account for the observed variation (21 %) in DC attained in a BT/ACP composite 2 h after cure (69.5 %) and in the DC of the TPH composite (57.5 %) having the same C-factor. The cavity design factor seems to play a key role in influencing the PSD of bonded composites, but other factors such as composite mass and composition also must be considered for their effects on PSD. View Full-Text
Keywords: Amorphous calcium phosphate; cavity design factor; composite; resin; polymerization stress; tensometry Amorphous calcium phosphate; cavity design factor; composite; resin; polymerization stress; tensometry

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Antonucci, J.M.; Giuseppetti, A.A.; O’Donnell, J.N.; Schumacher, G.E.; Skrtic, D. Polymerization Stress Development in Dental Composites: Effect of Cavity Design Factor. Materials 2009, 2, 169-180.

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