Effect of cyclic loading and retightening on reverse torque value in external and internal implants

The Journal of Advanced Prosthodontics
Woong-Rae ChoLee-Ra Cho

Abstract

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. 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. 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. 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.

References

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Citations

Jan 6, 2017·Journal of the Korean Association of Oral and Maxillofacial Surgeons·Antonio Gabriel Lanata-FloresJosé Ricardo de Albergaria-Barbosa
Apr 25, 2017·The Journal of Advanced Prosthodontics·Mahnaz ArshadMohammadreza Rahimi Yeganeh
Dec 7, 2018·International Journal of Implant Dentistry·Mai Ahmed Yousry El-SheikhMohamed Maamoun El-Sheikh
Jan 15, 2019·International Journal of Implant Dentistry·Kanyarin BenjaboonyazitPathawee Khongkhunthian
Feb 4, 2021·Journal of Family Medicine and Primary Care·Ebrahim F Alsubaiy

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