title: [A dynamic functional comparative analysis of screw retained vs cement retained crowns under cyclic fatigue testing].
abstract: OBJECTIVE
  To investigate the stability and mechanical characteristics of screw-retained and cement-retained crowns under dynamic cyclic fatigue testing.
  
  
  METHODS
  Screw-retained and cement-retained crown samples were fixed on a 227 kg pressure transducer, through computer control cyclic fatigue testing was performed under a load of 15 kg on the sample during testing. Crown mobility was assessed in PTV value and the failure pattern of crowns were recorded.
  
  
  RESULTS
  The initial PTV of cement-retained and screw-retained samples were not significant difference. The stability of the two group samples was no significant difference after testing. However the pattern of failure in two group samples was different.
  
  
  CONCLUSIONS
  Both screw-retained and cement-retained methods may provide sufficient retentive force to keep stability of the crown in masticatory function.
authors.affiliation: Department of Prosthodontics, College of Stomatology, Wuhan University, Wuhan 430079, China.
authors.forename: B
authors.initials: B
authors.lastname: Shi
authors.forename: Z
authors.initials: Z
authors.lastname: Wu
authors.forename: Y
authors.initials: Y
authors.lastname: Wang
mesh_terms: D001696:Biomechanical Phenomena; D001863:Bone Screws; D003738:Dental Cements; D015921:Dental Implants; D006801:Humans; D019228:Tooth Crown / Q000502:physiology*
chemical_list: D003738:Dental Cements; D015921:Dental Implants