The Effect Of Different Polishing Systems On The Surface Roughness Of The Tooth Coloured Restorative Materials
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Date
2010-12
Authors
Mohammed Ali Nema, Zaid Hameed
Journal Title
Journal ISSN
Volume Title
Publisher
Universiti Sains Malaysia
Abstract
The aim of this study was to evaluate the surface roughness of nanofilled glass-ionomer compared to microfilled glass-ionomer and nanofilled composite using three different types of polishing techniques. This study also evaluated the biofilm thickness of the test materials after 14 and 30 days growth Streptococcus mutans (S.mutans) and the effect of surface roughness after 30 days biofilm formation. An acrylic mold was used to prepare 5 mm x 2 mm disk specimens. The test material was packed into the mold forming 21 similar disks (Set A), seven of each test material; nanofilled glass-ionomer, microfilled glass-ionomer and nanofilled composite respectively. Then the disks were covered with a Mylar strip and photo-polymerized using a conventional light-curing unit, according to manufacturer’s instruction. The disks were then examined in contact mode under Atomic Force Microscopy to evaluate the surface roughness of those three dental materials. After that a 10 μml drop of bacterial suspension (S. mutans) was placed on each sample. The samples were then placed in a container with 50 ml of brain heart infusion (BHI) broth supplemented with 0.2 units/ml of bacitracin and sucrose present in an amount of about 20 percent by weight then incubated at 37˚C to allow the formation of a 30 day-old biofilm. After 30 days, all disks were reexamined in contact mode under Atomic Force Microscopy to evaluate their surface roughness. Set B consisted of 84 disks of the test materials with similar dimension to Set A; with 28 disks for each test material. Each test material were divided into three treatment groups and one control group; each group consisting of seven samples (n=7).
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Keywords
Polishing Systems On The Surface Roughness , Tooth Coloured Restorative