The Journal of Advanced Prosthodontics

  • 제7권5호
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  • Pages.375-379
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  • 2015
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  • 2005-7806(pISSN)
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  • 2005-7814(eISSN)
대한치과보철학회 (The Korean Academy of Prosthodonitics)
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Loosening torque of Universal Abutment screws after cyclic loading: influence of tightening technique and screw coating

  • Bacchi, Atais (Meridional Faculty - IMED, School of Dentistry, Prosthodontics and Dental Materials) ;
  • Regalin, Alexandre (Meridional Faculty - IMED, School of Dentistry, Prosthodontics and Dental Materials) ;
  • Bhering, Claudia Lopes Brilhante (Piracicaba Dental School, Campinas State University, Prosthodontics and Periodontics) ;
  • Alessandretti, Rodrigo (University of Passo Fundo, Post-graduate Program in Dentistry, Dental School) ;
  • Spazzin, Aloisio Oro (Meridional Faculty - IMED, School of Dentistry, Prosthodontics and Dental Materials)
  • 투고 : 2015.05.12
  • 심사 : 2015.09.23
  • 발행 : 2015.10.30
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초록

PURPOSE. The purpose of this study was to evaluate the influence of tightening technique and the screw coating on the loosening torque of screws used for Universal Abutment fixation after cyclic loading. MATERIALS AND METHODS. Forty implants (Titamax Ti Cortical, HE, Neodent) (n=10) were submerged in acrylic resin and four tightening techniques for Universal Abutment fixation were evaluated: A - torque with 32 Ncm (control); B - torque with 32 Ncm holding the torque meter for 20 seconds; C - torque with 32 Ncm and retorque after 10 minutes; D - torque (32 Ncm) holding the torque meter for 20 seconds and retorque after 10 minutes as initially. Samples were divided into subgroups according to the screw used: conventional titanium screw or diamond like carbon-coated (DLC) screw. Metallic crowns were fabricated for each abutment. Samples were submitted to cyclic loading at $10^6$ cycles and 130 N of force. Data were analyzed by two-way ANOVA and Tukey's test (5%). RESULTS. The tightening technique did not show significant influence on the loosening torque of screws (P=.509). Conventional titanium screws showed significant higher loosening torque values than DLC (P=.000). CONCLUSION. The use of conventional titanium screw is more important than the tightening techniques employed in this study to provide long-term stability to Universal Abutment screws.

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참고문헌

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