Preload Evaluation of Different Screws in External Hexagon Joint
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Data
2012-02-01
Autores
Assunção, Wirley Goncalves [UNESP]
Delben, Juliana Aparecida [UNESP]
Tabata, Lucas Fernando
Barao, Valentim Adelino Ricardo [UNESP]
Gomes, Erica Alves
Garcia, Idelmo Rangel [UNESP]
Título da Revista
ISSN da Revista
Título de Volume
Editor
Lippincott Williams & Wilkins
Resumo
Purpose: This study compared the maintenance of tightening torque in different retention screw types of implant-supported crowns.Materials and Methods: Twelve metallic crowns in UCLA abutments cast with cobalt-chromium alloy were attached to external hexagon osseointegrated implants with different retention screws: group A: titanium alloy retention screw; group B: gold alloy retention screw with gold coating; group C: titanium alloy retention screw with diamond-like carbon film coating; and group D: titanium alloy retention screw with aluminum titanium nitride coating. Three detorque measurements were obtained after torque insertion in each replica. Data were evaluated by analysis of variance (ANOVA), Tukey's test (P < 0.05), and t test (P < 0.05).Results: Detorque value reduced in all groups (P < 0.05). Group A retained the highest percentage of torque in comparison with the other groups (P < 0.05). Groups B and D retained the lowest percentage of torque without statistically significant difference between them (P < 0.05).Conclusions: All screw types exhibited reduction in the detorque value. The titanium screw maintained the highest percentage of torque whereas the gold-coated screw and the titanium screw with aluminum titanium nitride coating retained the lowest percentage. (Implant Dent 2012;21:46-50)
Descrição
Palavras-chave
dental implants, implant-supported dental prosthesis, prosthesis failure, torque
Como citar
Implant Dentistry. Philadelphia: Lippincott Williams & Wilkins, v. 21, n. 1, p. 46-50, 2012.