Stength Analysis On Porcelain Laminate Veneers Of Different Designs

ObjectiveTo study the destructive process of porcelain laminate veneers of differentdesigns by using two—dimensional finite element software (RFPA) andsupercomputer "Deep-comp6800",and to compare the strenghth of differentdesigns with RGT-5.And to seek the methods to improve the strength ofveneer-abutment complex.MethodsTo generate RFPA maxillary cut teeth sagittal anatomical shape byApplication of software modeling tools. The destructive processes of twelveporcelain veneer models with four different designs under edge to edge loadwere analyzed by using RFPA.Then comparing the broken position and load ofdifferent kinds when the damage just appeared. Collection of25upper centralincisors from clinical were randomly devided into five groups,to make fourkinds of porcelain laminate veneers for20teeth(I type, L type, U type andveneer crown,by comparison with natural teeth.Embedding with epoxy resinafter Conwentional cementation. To test the compressive strength ofveneer-tooth complex and natural tooth with RGT-5. Compareing the locationand damaged load of different veneer-tooth complex.ResultsThe damage location of veneer-tooth complex modle made by RFPA andvitro veneer-tooth complex were all appeared in Adhesive layer under bladeloading condition. The breakage location of I type and L type design showedat the incisal edge between the veneer and the abutment,While breakage location of U type and veneer crown type design appeared at the lingualedge between the veneer and the abutment. The maximum load they canbear are obvious different. Model of L type design supported lower load thanthe others,and the load supported by the three others is not obvious.Conclusion1. The direct method of improving the strength of veneer-tooth complex isChoosing high strength cement.2. Model of L type design supported lowest load under blading load.3. Model of veneer crown type design supported highest load under bladingload.