Synthetic Resins
Answer:
a) The addition of inorganic filler particles to the organic matrix of monomers enhances important mechanical properties of the composites making them stronger, stiffer and tougher.
Positive aspects of filler particles are:
• They impart strength and aid good mechanical bonding of composite (Söderholm, M. 1999), thereby increasing abrasion resistance and fracture toughness, making the material easy to cut and polish and aesthetically pleasing.
• They help reduce the amount of matrix material, reinforcing it to produce increased compressive strength, tensile strength and modulus of elasticity (stiffness) and decreased wear.
• They reduce the polymerization shrinkage of the material and improve its workability
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Karabela, M., Sideridou, I.(2011) Synthesis and study of properties of dental resin composites with different nanosilica particles size. Dental Materials, 27 (8 / August), pp. 825–835.
5. Karl-Johan M. Söderholm (1999). Chemistry of synthetic resins. [online] (30/04/2000) Available from: http://nersp.nerdc.ufl.edu/~soderho/E03.htm accessed 15/04/2015].
6. Klapdohr, S. , Moszner, N. (2005). New inorganic components for dental filling composites Monatsh Chemistry, 136 pp. 21–45.
7. Lee, I.B., et al (2003) Rheologic properties of flowable, conventional hybrid, and condensable composite resins. Dental materials, 19 (4/June), pp. 298–307.
8. Seyed Mostafa Mousavinasab (2011). Effects of Filler Content on Mechanical and Optical Properties of Dental Composite Resin, Metal, Ceramic and Polymeric Composites for Various Uses. [online] Available from: http://www.intechopen.com/books/metal-ceramic-and-polymeric-composites-for-various-uses/effects-of-filler-content-on-mechanical-and-optical-properties-of-dental-composite-resin [Accessed 17/04/2015].
9. Watts, D. (2015).The Structures of Materials used in Dentistry Part 1 from Unit 1, Module 5 Foundations of Material Science. University of Manchester, webinar. Available at: https://msc-raad.healthcare-learning.com/mod/scorm/view.php?id=1930 [Accessed
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