A Comparative Study Of Three Crown Materials And Enamel The Wearing Ability In Vitro

Objective: By comparing with the friction and wear properties of three crown materials and tooth enamel in vitro experiment,to provide a certain experiment basis for choosing the repair materials with the wear resistance close to nature tooth in clinical.Methods: Choosing the veneering porcelain with highly polishing,aierchuang zirconia and machinable compound resin material Lava Ultimate as the experiment group,the tooth enamel as the control group.Taking the steatite ceramics as resist ware material,simulating the oral environment to do the friction and wear experiment on the CFT-I type material surface properties general-purpose tester.By testing the inspection of surface roughness Ra,surface hardness,abrasion loss and rubbed surface to study the friction and wear properties between abrasion loss and different materials.The statistical analysis was conducted by the method of one-way analysis of variance.Results: Compared with the enamel group,the self-abrasion loss of the three materials and abrasion loss of the resist ware material have statistic difference(P<0.05),Compared with veneering porcelain,the zirconia had a better abrasive resistance and lower abrasion of resist ware material;compared with tooth enamel,the Lava Ultimate had a better abrasive resistance and lower abrasion of resist ware material;compared with the veneering porcelain and zirconia,Lava Ultimate closed to the tooth enamel more on the aspects of wear-resisting property and abrasion of resist wear material.Conclusions: In conclusion,zirconia is more suitable for bruxism and molar restorations with limited occlusal space.From the perspective of wear resistance,Lava Ultimate is more similar to natural tooth enamel and has advantages for posterior tooth restoration compared with surface porcelain and zirconia.Due to the limited conditions of in vitro studies,which cannot fully reflect the real oral environment and the wear and tear under the physiological state of chewing,whether Lava Ultimate can meet the clinical needs still requires a large number of studies and long-term clinical observation.This study only a comparative analysis from the perspective of abrasion resistance,about veneer porcelain,zirconium oxide and Lava Ultimate these three crown restoration materials of other mechanical properties and biological performance remains to be further discussed.