Objective To study the destructive process of porcelain laminate veneers of different designs by using real fracture process analysis（RFPA） software. Methods The labial-lingual sections of upper central incisor were modeled by using RFPA. The destructive processes of twelve porcelain veneer models with four different designs: I type, L type, U type and veneer crown type, were analyzed by RFPA. Results Breakage of cement layer appeared in the first instance under edge to edge load. I type and L type design showed breakage location was at the incisal edge between the veneer and the abutment. U type and veneer crown type design showed breakage location was at the lingual edge between the veneer and the abutment or shoulder edge. Model of L type design supported lower load than the others. Conclusion Choosing high strength cement would raise the strength of veneer-tooth complex. Model of L type design supported lower load than the others at edge to edge conclusion.
