A Empirical Study On Friction And Wear Behavior For Human Enamel And Three Kinds Of Composite Resins

Objective: To study human enamel and three kinds of composite resin materials in vitro fiction and wear test for the wear extent and coefficient of fiction by compareing the wear resistance of three kinds of resin and observe wear mechanism with scanning electron microscope. Methods: To select the exelcymosis of maxillary central incisor due to periordontal disease(control group) and complete removal of the mandibular third molars (experimental group). There is no need to have special handing of control group of facies labialis. In the experimental group at the occlusal surface to do a classⅠcavity, requesting all the lateral walls 8mm×8mm and depth of hole is 3mm-5mm and non-perforating medullary cavity. Then it canbe divided into three groups and composite resin filling: group A with 3M Filteka? Z350; group B with DENTSPLY TPH? Spectrum?; group C with CLEARFIL AP-X?. Composite resin formed and polished surface placed in distilled water at room temperature, after the water bath in two weeks with the UMT-2-type wear test, test specimen before and after the recording of wear extent, the computer will record coefficient of friction and calculate the average coefficient of friction., and use scanning electron microscope observation. Results: The less wear of Control group is less than experimental group (P<0.05) and the less wear of group A was less than group B and C(P<0.05). Friction coefficient of contral group is greater than group A but less than group B and C (P<0.05) and friction coefficient of Group A is greater than group B and C(P<0.05). So the differences has statistical significant. The coefficient of friction of group B and C has no statistical significant (P>0.05). The results of scanning of electron microscope show that there are damaged areas of enamel in group A; The wear characteristics of group A are different from group B and C. Conclusion: The nano-filler in the wear performance is better than composite filler composite resin dental filling, and it shows the future development directions of .