The Journal of Advanced Prosthodontics

  • 제7권4호
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  • Pages.288-293
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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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Effect of cyclic loading and retightening on reverse torque value in external and internal implants

  • Cho, Woong-Rae (Department of Prosthodontics and Research Institute of Oral Science, College of Dentistry, Gangneung-Wonju National University) ;
  • Huh, Yoon-Hyuk (Department of Prosthodontics and Research Institute of Oral Science, College of Dentistry, Gangneung-Wonju National University) ;
  • Park, Chan-Jin (Department of Prosthodontics and Research Institute of Oral Science, College of Dentistry, Gangneung-Wonju National University) ;
  • Cho, Lee-Ra (Department of Prosthodontics and Research Institute of Oral Science, College of Dentistry, Gangneung-Wonju National University)
  • 투고 : 2014.12.15
  • 심사 : 2015.06.04
  • 발행 : 2015.08.31
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초록

PURPOSE. The aim of this study was to evaluate the effect of cyclic loading and screw retightening on reverse torque value (RTV) in external and internal type implants. MATERIALS AND METHODS. Cement-retained abutments were connected with 30 Ncm torque to external and internal type implants. Experimental groups were classified according to implant connection type and retightening/loading protocol. In groups with no retightening, RTV was evaluated after cyclic loading for 100,000 cycles. In groups with retightening, RTV was measured after 3, 10, 100 cycles as well as every 20,000 cycles until 100,000 cycles of loading. RESULTS. Every group showed decreased RTV after cyclic loading. Before and after cyclic loading, external type implants had significantly higher RTVs than internal type implants. In external type implants, retightening did not affect the decrease in RTV. In contrast, retightening 5 times and retightening after 10 cycles of dynamic loading was effective for maintaining RTV in internal type implants. CONCLUSION. Retightening of screws is more effective in internal type implants than external type implants. Retightening of screws is recommended in the early stage of functional loading.

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참고문헌

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  10. Comparison of the Effect of Four Different Abutment Screw Torques on Screw Loosening in Single Implant-Supported Prosthesis after the Application of Mechanical Loading vol.2021, pp.None, 2015, https://doi.org/10.1155/2021/3595064