Effect of casting procedures on screw loosening in UCLA-type abutments

Journal of Prosthodontics : Official Journal of the American College of Prosthodontists
Stefania C KanoDonald A Curtis

Abstract

Screw loosening of implant restorations continues to be a complication in implant prosthodontics. Screw joints are subjected to a loss of initially applied torque because of friction and component misfit. It has been suggested that the loss of applied torque is less in machined metal abutments than in cast plastic abutments. This study compared the loss of applied torque (detorque) values in machined titanium and in cast UCLA-type abutments for external hex abutment/implant interface. Four groups of 12 samples each were evaluated: (1) machined titanium abutments, (2) premachined palladium abutments cast with palladium, (3) plastic abutments cast with nickel-chromium, and (4) plastic abutments cast with cobalt-chromium. Each abutment was torqued to 30 Ncm according to the manufacturer's instructions and detorqued three times. The mean loss of applied torque (detorque) was recorded as a percentage of the torque applied. Group means were calculated and compared using ANOVA and Tukey's LSD test. Mean detorque values were (1) 92.3 +/- 2.9%, (2) 81.6 +/- 5.0%, (3) 86.4 +/- 4.6%, and (4) 84.0 +/- 7.0%. Machined abutments demonstrated significantly greater detorque values compared with all cast groups (p < 0.05). No significant differe...Continue Reading

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Citations

Jan 10, 2012·Implant Dentistry·Wirley Gonçalves AssunçãoIdelmo Rangel Garcia
Nov 4, 2011·The Journal of Oral Implantology·Mansoor RismanchianHossein Goroohi
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Oct 16, 2015·Journal of Prosthodontics : Official Journal of the American College of Prosthodontists·Cláudia Lopes Brilhante BheringMarcelo Ferraz Mesquita
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