title: Influence of torsional strength on different types of dental implant platforms.
abstract: OBJECTIVE
  The study assessed deformation of implant components submitted to torsion tests of 80 and 120 N · cm using an optical stereomicroscope.
  
  
  METHODS
  The following 3 types of Titaniumfix conical implant connections (n = 5) measuring Ø 4.0 × 11.5 mm were used: external, internal hexagon and Morse taper connections. The diagonal and lateral measurements of the hexagon implant platform were measured before and after the torsion test.
  
  
  RESULTS
  The torsion test using torque of 80 and 120 N · cm altered the implant dental platforms. All groups presented deformation of implant component after torque of 80 N · cm with no statistical difference among them. During torque of 120 N · cm, a difference in the Morse taper connection in relation to the internal and external hexagon connection was observed. The Morse taper connection implant, followed by the internal hex implant, underwent less deformation. Greater deformation occurred in the external hex implants.
  
  
  CONCLUSIONS
  For all the implants, high insertion torques deformed the implant platform preventing long-term maintenance and stability of implants.
authors.affiliation: *Postgraduate Student, Department of Dental Materials and Prosthodontics, Dental School of Ribeirão Preto, University of São Paulo, Ribeirão Preto, São Paulo, Brazil. †Associate Professor, Department of Biomechanics, Medicine and Rehabilitation of the Locomotor System, Medicine School of Ribeirão Preto, University of São Paulo, Ribeirão Preto, São Paulo, Brazil. ‡Research Laboratory Specialist, Department of Dental Materials and Prosthodontics, Dental School of Ribeirão Preto, University of São Paulo, Ribeirão Preto, São Paulo, Brazil. §Postgraduate Student, Department of Dental Materials and Prosthodontics, Dental School of Ribeirão Preto, University of São Paulo, Ribeirão Preto, São Paulo, Brazil. ‖Titular Professor, Department of Dental Materials and Prosthodontics, Dental School of Ribeirão Preto, University of São Paulo, Ribeirão Preto, São Paulo, Brazil.
authors.forename: Ana Beatriz V
authors.initials: AB
authors.lastname: Teixeira
authors.forename: Antônio Carlos
authors.initials: AC
authors.lastname: Shimano
authors.forename: Ana Paula
authors.initials: AP
authors.lastname: Macedo
authors.forename: Mariana L C
authors.initials: ML
authors.lastname: Valente
authors.forename: Andréa C
authors.initials: AC
authors.lastname: dos Reis
mesh_terms: D000044:Dental Abutments; D059605:Dental Implant-Abutment Design; D015921:Dental Implants; D017268:Dental Prosthesis Retention; D019232:Dental Restoration Failure; D003799:Dental Stress Analysis; D006801:Humans; D008853:Microscopy; D019415:Torque; D054159:Torsion, Mechanical
chemical_list: D015921:Dental Implants