Effects of finishing/polishing time on surface characteristics of tooth-coloured restoratives.
This study compared the effects of immediate and delayed finishing/polishing procedures on the surface characteristics (surface roughness and hardness) of tooth-coloured restoratives including a microfilled, a heavily filled and a polyacid-modified composite resin and a resin-modified glass-ionomer cement. Eighty-four specimen discs were made for each material; the first 12 were used as controls and the remaining 72 specimens were randomly divided into two equal groups. The first group was finished/polished immediately after light polymerization and stored for 1 week in distilled water at 37 degrees C while the second group was finished/polished after 1 week storage in distilled water at 37 degrees C. Finishing and polishing was carried out using the following systems: Enhance system, white stones with Vaseline and Super-snap disks system. The finished/polished surfaces were subjected to profilometric evaluation and microhardness testing. The effects of delayed finishing/polishing procedures on surface roughness and hardness appear to be both material and technique dependent. Delayed finishing/polishing of polyacid-modified composite resins and resin-modified glass-ionomer cements generally resulted in a smoother surface. The surface roughness of composite resins after finishing/polishing procedures were generally not influenced by the finishing/polishing time. For all materials, delayed finishing/polishing with the various techniques generally resulted in a surface of similar hardness to or harder than that obtained with immediate finishing/polishing and the control group.
Department of Restorative Dentistry, Faculty of Dentistry and Centre for Biomedical Materials Applications & Technology, National University of Singapore, Singapore.
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Yap
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Sau
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Lye
D017438:Bisphenol A-Glycidyl Methacrylate; D020770:Compomers; D003188:Composite Resins / Q000737:chemistry*; D003775:Dental Polishing / Q000379:methods*; D003793:Dental Restoration, Permanent / Q000379:methods*; D005899:Glass Ionomer Cements / Q000737:chemistry*; D006244:Hardness; D008689:Methacrylates; D010316:Particle Size; D012117:Resins, Synthetic; D017640:Silicates; D012822:Silicon Dioxide; D013499:Surface Properties; D013997:Time Factors; D015040:Zirconium
D020770:Compomers; D003188:Composite Resins; C088486:Dyract; D005899:Glass Ionomer Cements; D008689:Methacrylates; C081144:Photac-Fil; D012117:Resins, Synthetic; D017640:Silicates; C083568:Z100 composite resin; D017438:Bisphenol A-Glycidyl Methacrylate; D012822:Silicon Dioxide; D015040:Zirconium