The Experimental Study of Effect of Different Polishing Methods on Surface Roughness of Flexible Denture Base Material
|School||Dalian Medical University|
|Keywords||flexible denture base polishing surface roughness|
Objectives: To evaluate effects of different polishing methods on flexible denture base. some evidence can be provided to choose the fitting polishing method for clinic work .Methods: 90 specimens were randomly divided into 3 groups. Polishing casts are finished with silicon gel wheel ,silicon trimming stone and sand paper roll and polished by cloth wheel with water, polishing wax or polishing brei respectively Surface roughness (Ravalue) of each casting was measured with a profilometre, and observation was made through scanning electron microscope .Data were statistically analyzed .Results: Though three ways of coarse grinding and smooth grinding , there was statistical significant difference (P<0.05) in the surface roughness of group silicon gel wheel, silicon trimming stone and sand paper roll.Observation by scanning electron microscope: Surface roughness of specimens finished through silicon gel wheel ,silicon trimming stone or paper roll were different . there were more cratch on the surface of specimens finished by silicon trimming stone, and the cratch were deeper in group of silicon gel wheel, there were less cratch which were more thinner. the most smoothest surface was obtained in group of sand paper roll polished by cloth wheel with polishing wax and polishing brei .Conclusions: The roughness of flexible denture base was influenced by statistical and mathematical technicians Coarse grinding with sand paper roll ,smooth grinding with polishing wax and polishing brei achieve the smoothest surface which can be available in clinic.