Comparative study on surface roughness of polishing cercon zirconia with four polishing tools

Objective To evaluate the polishing finish of four different polishing tools. Methods Fifty specimens were selected from suitable zirconia and randomly divided into 5 groups with 10 specimens in each group. Group A was the negative control group; Group B was the EVE group; Group C was the SHOFU group; Group D was the Toboom group, and Group E was the NAIS group. All specimens were subjected to surface roughness measurements after each level of treatment. One specimen in each group was randomly selected after each level of treatment and put into the vacuum coater for surface gold spraying, and then put into the scanning electron microscope for surface morphology observation after vacuuming. Results Final Ra value: The negative group ((1.677±0.066)μm)>SHOFU group ((0.357±0.037)μm)>EVE group ((0.248±0.051)μm)>Toboom group ((0.115±0.039)μm) and NAIS group ((0.123±0.029)μm). Scanning electron microscope observation showed that the deepest and longest scratches were left on the surface of the specimen with the diamond needle, and the surface of the specimen was gradually smoothed by using the polishing kit to treat the surfacein turn. The surface of the specimens polished by NAIS group and Toboom group had the least and shallow scratches under the mirror. Conclusion Toboom and NAIS zirconia polishing tools provide the best polishing results.