A suitable base material for composite resin restorations: Zinc oxide eugenol

作者：He Li Hong^*; Purton David G; Swain Michael V

来源：Journal of Dentistry, 2010, 38(4): 290-295.

DOI：10.1016/j.jdent.2009.11.009

• Zinc oxide eugenol
• Composite resin
• Dental base
• Nanoindentation

Objective: This in vitro study evaluated the effects of a zinc oxide eugenol (ZOE) base on the mechanical properties of a composite resin restoration.
Methods: Class I cavities were prepared on plastic teeth and filled with ZOE plus composite resin, following standard clinical procedures. The samples were sectioned sagittally and the ZOE-resin interface was exposed. After polishing, nanoindentation was performed on the region near the interface, and elastic modulus and hardness were plotted in the form of a color contour map. SEM was employed to observe the interface between composite resin and ZOE base.
Results: In the region close to the ZOE base, the elastic modulus and hardness of composite resin reduced to the values of 9.71 +/- 0.54 and 0.51 +/- 0.05 GPa, respectively. Eugenol from ZOE had detrimental effects on the composite resin only to a distance of less than 100 mu m from the ZOE base.
Conclusion: Although eugenol suppresses polymerization slightly, by considering the biological advantages of ZOE, together with the results of the current investigation, ZOE may still be considered a suitable base material for composite resin. Bonding is essential for composite resin restorations over ZOE bases to avoid shrinkage detachment.

• 出版日期2010-4