title: A study on optimal bonding angles of bi-material interfaces in dental crowns with porcelain fused to metal.
abstract: Interfaces between two different materials exist in the dental crowns used in dental restoration work. A common failure mode observed in dental crowns is debonding/fracture that is initiated at the corners of the interface between two materials, where a stress concentration or a stress singularity can be created. In this paper, finite element modelling and analytical methods are used to analyse the stress singularity at the free edge corners at the interfaces between porcelain and metal and also metal and cement in porcelain-fused-to-metal (PFM) crowns. Optimal ranges of bonding angles at the corners of the interface, that result in the elimination of the stress singularity, are obtained for PFM crowns made from a precious-metal-based or non-precious-metal-based alloy, respectively. The findings presented in this paper can serve as guidelines for the design and manufacture of PFM dental crowns.
authors.affiliation: Department of Mechanical Engineering, University of Alberta, Edmonton, Alberta, Canada.
authors.forename: M A K
authors.initials: MA
authors.lastname: Chowdhuri
authors.forename: Z
authors.initials: Z
authors.lastname: Xia
authors.forename: D
authors.initials: D
authors.lastname: Yu
mesh_terms: D001698:Biomedical Engineering; D003442:Crowns; D001840:Dental Bonding; D003776:Dental Porcelain; D019232:Dental Restoration Failure; D003799:Dental Stress Analysis; D020342:Finite Element Analysis; D006801:Humans; D008422:Materials Testing; D016876:Metal Ceramic Alloys; D003765:Models, Dental
chemical_list: D016876:Metal Ceramic Alloys; D003776:Dental Porcelain