A new approach to influence contact angle and surface free energy of resin-based dental restorative materials
✍ Scribed by Stefan Rüttermann; Taina Trellenkamp; Nora Bergmann; Wolfgang H.-M. Raab; Helmut Ritter; Ralf Janda
- Publisher
- Elsevier Science
- Year
- 2011
- Tongue
- English
- Weight
- 254 KB
- Volume
- 7
- Category
- Article
- ISSN
- 1742-7061
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✦ Synopsis
The purpose of the present study was to identify novel delivery systems and active agents which increase the water contact angle and reduce the surface free energy when added to resin-based dental restorative materials. Two delivery systems based on zeolite or novel polymeric hollow beads (Poly-Pore), loaded with two low surface tension active agents (hydroxy functional polydimethylsiloxane and polydimethylsiloxane) or a polymerizable active agent (silicone polyether acrylate) were used to modify commonly formulated experimental dental resin composites. The non-modified resin was used as a standard (ST). Flexural strength, flexural modulus, water sorption, solubility, polymerization shrinkage, surface roughness R a , contact angle h, total surface free energy c S , and the apolar c S LW , polar c S AB , Lewis acid c S + and base c S -components, and the active agents surface tensions c L were determined (P < 0.05). The active agents did not differ in c L . The modified materials had significantly higher h but significantly lower c S , c S AB and c S -than the ST. A Poly-Pore/polydimethyl siloxane delivery system yielded the highest h (110.9 ± 3.5°) acceptable physical properties and the lowest values for c S LW and c S -. Among the modified materials the polymerizable materials containing active agents had the lowest c AB and the highest c S + and c S -. Although not significant, both of the zeolite delivery systems yielded higher c S LW , c S + and c S -but lower c S AB than the Poly-Pore delivery systems. Poly-Pore based delivery systems highly loaded with low surface tension active agents were found not to influence the physical properties but to significantly increase the water contact angle and thus reduce surface free energy of dental resin composites.