title: Fracture strength of all-ceramic lithium disilicate and porcelain-fused-to-metal bridges for molar replacement after dynamic loading.
abstract: The replacement of missing posterior teeth using all-ceramic bridges remains a challenge. This study compares the fracture resistance of all-ceramic 3-unit bridges for the replacement of first molars to conventional porcelain-fused-to-metal bridges. Human premolars and molars were used to create two test groups and one control group of 16 specimens each. To simulate clinical parameters, the specimens were exposed to cyclic fatigue loading in an artificial mouth with simultaneous thermocycling. All samples were thereafter exposed to fracture strength testing. Porcelain-fused-to-metal bridges showed significantly higher fracture strengths than all-ceramic bridges. However, the fracture strength of the all-ceramic bridges was higher than peak physiological chewing forces.
authors.affiliation: University of Michigan-School of Dentistry, 1011 N. University Ave., Ann Arbor, MI 48109-1078, USA.
authors.forename: Somsak
authors.initials: S
authors.lastname: Chitmongkolsuk
authors.forename: Guido
authors.initials: G
authors.lastname: Heydecke
authors.forename: Christian
authors.initials: C
authors.lastname: Stappert
authors.forename: Joerg R
authors.initials: JR
authors.lastname: Strub
mesh_terms: D000538:Aluminum Silicates / Q000737:chemistry; D001641:Bicuspid; D001732:Bite Force; D002484:Cementation; D002516:Ceramics / Q000737:chemistry*; D000044:Dental Abutments; D003776:Dental Porcelain / Q000737:chemistry*; D003799:Dental Stress Analysis / Q000295:instrumentation; D003779:Denture Design; D003830:Denture, Partial, Fixed; D006047:Gold Alloys / Q000737:chemistry; D006801:Humans; D018020:Lithium Compounds / Q000737:chemistry*; D016555:Matched-Pair Analysis; D016876:Metal Ceramic Alloys / Q000737:chemistry*; D008963:Molar; D019279:Resin Cements / Q000737:chemistry; D017640:Silicates / Q000737:chemistry*; D018709:Statistics, Nonparametric; D013314:Stress, Mechanical; D013499:Surface Properties; D013816:Thermodynamics; D016474:Weight-Bearing
chemical_list: D000538:Aluminum Silicates; D006047:Gold Alloys; C075815:IPS-Empress ceramic; D018020:Lithium Compounds; D016876:Metal Ceramic Alloys; D019279:Resin Cements; D017640:Silicates; C110711:vita omega; D003776:Dental Porcelain; C103502:Variolink