Effect of Air-polishing on Surface Wear Resistance of Different Dental Tissues and Dental Filling Materials
Objective To investigate the surface wear resistance of dental tissues and dental filling materials under different air-polishing conditions.Methods Eight air-polishing groups were set according to different working distances and sandblasting powders,which were 3 mm sodium bicarbonate,3 mm glycine,3 mm erythrolitol,3 mm alumina,5 mm sodium bicarbonate,5 mm glycine,5 mm erythrolitol and 5 mm alumina,respectively.Samples of glass ionomer,flowable resin,hybrid composite resin,nano-filler composite resin,bulk-fill flowable composite,bulk-fill composite resin,dentin and enamel were processed.The thick-ness of the samples was measured by micrometer before and after processing,and the surface loss was statistically analyzed.At the same time,scanning electron microscopy(SEM)was used to analyse the changes of surface morphology.Results In the alu-mina treatment group,a large number of samples were broken down regardless of whether the working distance was 3 mm or 5 mm.In the other treatment groups,the maximum losses of enamel,dentin,glass ionomer,flowable resin,hybrid composite resin,nano-filler composite resin,bulk-fill flowable composite and bulk-fill composite were 13 μm,99 μm,222 μm,196 μm,228 μm,93μm,324 μm and 126 μm,respectively.The surface wear resistance of the nano-filler composite resin was similar to that of tooth enamel under all air-polishing conditions except in the 5 mm sodium bicarbonate group,and there was no significant difference in surface loss(P＞0.05).Conclusion Air-polishing can damage the tooth tissue and the surface of dental filling materi-als.Different dental filling materials show different surface wear resistance under air-polishing.
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