The Preliminary Observation Of The Friction And Wear Behaviors Of Dental Composite Resins With Fluorphlogopite-fluorapatite Fillers

Objectives:To investigate the friction and wear behaviors of the fluorphlogopite-fluorapatite composite resin preliminary, a comparative wear experiment was performed which could provide some references for further study.Methods:The wear test was performed by UMT-3wear testing machine using the liner reciprocating ball-flat geometry under a dry sliding environment. A chrome steel ball was used as the counter part. The friction factor-timing curve graph and the friction coefficient could be recorded by the computer. The depth and width of wear scar as well as appearance were measured by stereomicroscope.The tribology behavior was investigated and comgpared by friction coefficient curve and the depth and width of wear scar individually after statistics. The effect of the filler on the tribology behavior of composite resins was discussed.Results:1. Surface film formed among wear scar of the porous and dense fluorphlogopite-fluorapatite composite resins. The amount of debris, cracking and cave on the dense sample was much more than that of the porous sample. The appearance of patching and cracking was more obvious with the increasing of the filler fraction.2. The different resins showed the similar friction behavior. The friction coefficient curve of porous filler composite resins showed smoother in every period and the average friction coefficient decreased with the increasing of filler fraction. The running-in period of friction coefficient of dense composite resins was longer than that of the porous sample and the curve was rougher and appeared fluctuation after the peak.3. The wear scar of P60group was shallow, its width was bigger than70Wt%porous fillers group, but smaller than65Wt%and60Wt%. Among the porous groups, the width and depth of70Wt%were smaller than65Wt%and60Wt%, which suggested those composite resins filled with more fillers perform better wear resistance. The depth and width of wear scar of65Wt%were all relatively smaller than65Wt%porous samples.Conclusion:1. All the composite resins show similar friction behavior, which an increasing running-in period at first and then a steady period of the friction coefficient.2. The wear scar surface of the fluorphlogopite-fluorapatite composite resins shows cracking, patching and cave. The dense resin performs more obvious, which may have something to do with the size and pitting of the filler.3.Compared with the P60resin, the wear resistance of fluorphlogopite-fluorapatite composite resins should be further optimized.