Novel Nano-ceramic Coating On Polymethyl Methacrylate Denture Base Material
Session Number
B09
Advisor(s)
Su Huang, University of Illinois at Chicago Christos Takoudis, University of Illinois at Chicago
Location
A-119
Start Date
28-4-2016 10:40 AM
End Date
28-4-2016 11:05 AM
Abstract
Many dental appliances are made from the polymer polymethyl methacrylate (PMMA); however, PMMA has a relatively soft surface that is susceptible to scratches. Bacteria enter the grooves and cultivate, increasing the risk of infection for the user. To prevent this, the PMMA is strengthened by the application of TiO2, which is deposited by Atomic Layer Deposition (ALD). Before deposition, we wish to increase the wettability of PMMA so that there is a stronger bond between the PMMA and TiO2. In this investigation we tested the use of oxygen plasma treatment as a precursor to ALD. Various durations of plasma treatment and thickness of PMMA samples were tested in search of the best variables to increase wettability. To measure wettability, the water contact angle (WCA) of the samples was found before and after treatment. Results show that 45 seconds of oxygen plasma treatment resulted in a 74̊ to 39̊ decrease in WCA. Surface thickness had no effect on the water contact angle because the PMMA sample was at a millimeter level instead of a nanometer level. We did notice some fluctuation in the percent decrease in WCA. In the future we wish to further investigate surface roughness of the PMMA as it is known to have an effect on wettability.
Novel Nano-ceramic Coating On Polymethyl Methacrylate Denture Base Material
A-119
Many dental appliances are made from the polymer polymethyl methacrylate (PMMA); however, PMMA has a relatively soft surface that is susceptible to scratches. Bacteria enter the grooves and cultivate, increasing the risk of infection for the user. To prevent this, the PMMA is strengthened by the application of TiO2, which is deposited by Atomic Layer Deposition (ALD). Before deposition, we wish to increase the wettability of PMMA so that there is a stronger bond between the PMMA and TiO2. In this investigation we tested the use of oxygen plasma treatment as a precursor to ALD. Various durations of plasma treatment and thickness of PMMA samples were tested in search of the best variables to increase wettability. To measure wettability, the water contact angle (WCA) of the samples was found before and after treatment. Results show that 45 seconds of oxygen plasma treatment resulted in a 74̊ to 39̊ decrease in WCA. Surface thickness had no effect on the water contact angle because the PMMA sample was at a millimeter level instead of a nanometer level. We did notice some fluctuation in the percent decrease in WCA. In the future we wish to further investigate surface roughness of the PMMA as it is known to have an effect on wettability.