Assessment of Efficacy of Implant Screwdrivers' During Multiple Tightening/ Untightening Cycles. An in vitro Study.

Autor:	Batista R; Faculdade de Medicina Dentária, Universidade do Porto - R. Dr. Manuel Pereira da Silva, 4200- 393, Porto, Portugal., Moreira A; Faculdade de Medicina Dentária, Universidade do Porto - R. Dr. Manuel Pereira da Silva, 4200- 393, Porto, Portugal.; INEGI - Campus da FEUP, R. Dr. Roberto Frias 400, 4200-465 Porto., Alves N; Instituto Politécnico de Leiria - Campus 2, Morro do Lena, Alto do Vieiro, 2411-901, Leiria, Portugal., Figueiral MH; Faculdade de Medicina Dentária, Universidade do Porto - R. Dr. Manuel Pereira da Silva, 4200- 393, Porto, Portugal.; INEGI - Campus da FEUP, R. Dr. Roberto Frias 400, 4200-465 Porto., Sampaio-Fernandes JC; Faculdade de Medicina Dentária, Universidade do Porto - R. Dr. Manuel Pereira da Silva, 4200- 393, Porto, Portugal.; INEGI - Campus da FEUP, R. Dr. Roberto Frias 400, 4200-465 Porto.
Jazyk:	angličtina
Zdroj:	The European journal of prosthodontics and restorative dentistry [Eur J Prosthodont Restor Dent] 2024 Dec 11. Date of Electronic Publication: 2024 Dec 11.
DOI:	10.1922/EJPRD_2743Batista09
Abstrakt:	Introduction: It is unclear the number of times a screwdriver may be reused without loosening its efficacy or inducing damage to implant screws while keeping appropriate torque values. Objective: Evaluate the effect of the screwdriver and internal threads on the tightening efficacy by assessing the reverse torque value (RTV). Methods: The efficacy was tested with four groups of screws: two titanium groups and two gold-platted (n=5). Each screw was tightened 10 times at 20 Ncm using the screwdriver attached to ISD900 (NSK®). In the first protocol one implant was used for the five screws. In the second protocol for each screw a new implant was used. At each untightening, the RTV was measured and recorded. Results: RTVs for Gold were statistically lower compared to the Titanium. The RTVs differed among the tested screws. In the first protocol, the first serie tightening/untightening differed statistically from the last three series. Conclusion: Titanium screws from Zimmer Biomet achieve better RTV than gold-platted. By increasing the number cycles it is expected to have a decrease in the RTV. The extensive use of screwdrivers and the internal threads of the dental implants might be factors influencing the loss of RTV. (Copyright© 2024 Dennis Barber Ltd.)
Databáze:	MEDLINE
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