title: Influence of superstructure materials on strain around an implant under 2 loading conditions: a technical investigation.
abstract: OBJECTIVE
  This investigation was concerned with the effect of 3 superstructure materials on the strain around an implant under static and nonimpact dynamic loading.
  
  
  METHODS
  Five highly filled composite resin-veneered crown analogs, 5 autopolymerized acrylic resin-veneered crown analogs, and 5 gold-alloy full cast crown analogs were prepared. The resin veneers were applied to gold-alloy frameworks. These crown analogs were prepared to fit an ITI implant-abutment assembly, which was screwed into a block of acrylic resin to simulate implantation in bone. The crown analogs were successively placed on the abutment, and a lateral load of 100 N was applied to the superstructure by a lever-type testing machine. Strains were recorded under static and dynamic loading by a 2mm-long strain gauge bonded to the surface of the bone simulant tangential to the implant. The dynamic load simulated masticatory cycles (75 strokes/min).
  
  
  RESULTS
  Although the strain values differed significantly between the static and dynamic loading (P < .05), there was no significant difference among the superstructure materials under either loading condition (P > .05).
  
  
  CONCLUSIONS
  These findings are in agreement with in vivo measurements, thus suggesting that cyclic rather than impact loading should be used in the investigation of occlusal material behavior under functional loading.
  
  
  CONCLUSIONS
  Under static and nonimpact dynamic loading, the 3 superstructure materials tested (highly filled composite resin, acrylic resin, and gold alloy) had the same influence on the strain transmitted to a bone simulant that surrounded a single implant.
authors.affiliation: Division of Oral Health in Aging and Fixed Prosthodontics, Department of Oral Health Science, Niigata University Graduate School of Medical and Dental Sciences, Niigata, Japan. roxana@dent.niigata-u.ac.jp
authors.forename: Roxana
authors.initials: R
authors.lastname: Stegaroiu
authors.forename: Ameen
authors.initials: A
authors.lastname: Khraisat
authors.forename: Shuichi
authors.initials: S
authors.lastname: Nomura
authors.forename: Osamu
authors.initials: O
authors.lastname: Miyakawa
mesh_terms: D000180:Acrylic Resins / Q000737:chemistry; D020906:Air Abrasion, Dental; D001732:Bite Force; D003188:Composite Resins / Q000737:chemistry; D003442:Crowns; D000044:Dental Abutments; D015921:Dental Implants; D003764:Dental Materials / Q000737:chemistry*; D019094:Dental Prosthesis, Implant-Supported; D003799:Dental Stress Analysis / Q000295:instrumentation; D003801:Dental Veneers; D004548:Elasticity; D006047:Gold Alloys / Q000737:chemistry; D006801:Humans; D008409:Mastication / Q000502:physiology; D008422:Materials Testing; D013314:Stress, Mechanical; D013499:Surface Properties; D014159:Transducers
chemical_list: D000180:Acrylic Resins; D003188:Composite Resins; D015921:Dental Implants; D003764:Dental Materials; D006047:Gold Alloys