| 0952 Enamel Abrasion of Five Composite Polishing Systems | ||
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J.F. OYARZO, G. MONCADA, F. SEREY, and A. OYARZUN, University of Chile, Santiago, Chile Objective: The purpose of this in vitro study was to determine the effect on the enamel borders surrounding Class V restorations, with five different composite shaping and finishing procedures. Methods: 60 human teeth extracted for orthodontics indications were randomly separated in six groups 10 teeth each. For each teeth two cavities were made in free surfaces. 100 standardized Class V restorations were made using 835 Komet diamond burs, tap water irrigation in a highspeed handpiece (PanaAir NSK) by a single operator. All cavities were surrounded completely by enamel. They were polished with five different systems. Group 1: Aluminum Oxide Disks (AO)SofLex 3M; Group 2: Arkansas Stone burs (AS)Dedeco; Group 3: Diamond Burs (DB)Diatech (30-15 and 8 um); Group 4: Enhance Points (EP)Dentsply; Group 5: Tungsten-carbide finishing Burs (TB)Komet. Group 6 without enamel treatment as Control Group (CG). After the finishing procedures, morphological measurements of enamel surface characteristics were made using a Profilometer (Surtronic). Additionally, the samples were analyzed and photography by SEM, (TEAC Siemens), and optical microscope (CarlZeiss), the images were compared with control group. The results were subjected to a 2-way analysis of variance for sound enamel and finishing technique (P< 0.05). Results: The profilometer observations showed significant differences in surface roughness using DB (12.23 um p=0,0195). No significant difference were observed comparing CG (6,53 um) with AO (6.05 um p=0,497), AS (7.805 um p=0,4235), EP (6.255 um p=0,7615) and TB (7.415 um p=0,564). The comparison of the microphotographs shows loss of surrounding enamel borders in every analyzed image. The microphotography of group 3 (DB) showed the most severe enamel loss. Conclusion: The five polishing systems, resulted in surface abrasion of the enamel surrounding the composite restorations. Of all systems, AO removed less enamel and provided the smoothest surface. The finishing diamond burs showed the most severe enamel abrasion. | ||
| Seq #106 - Color and Surface Roughness of Restorative Materials 3:45 PM-5:00 PM, Thursday, 26 June 2003 Svenska Massan Exhibition Hall B | ||
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