Influence of Liquid Lubrication on the Screw-Joint Stability of Y-TZP Implant Abutment Systems
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Data
2017-12-01
Autores
Basílio, Mariana de Almeida [UNESP]
Abi-Rached, Filipe de Oliveira [UNESP]
Butignon, Luis Eduardo
Arioli Filho, João Neudenir [UNESP]
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Resumo
Purpose: To evaluate the effectiveness of abutment screws coated with liquid Vaseline on the screw-joint stability of yttria-stabilized tetragonal zirconia (Y-TZP) abutment systems. Materials and Methods: Forty Y-TZP prefabricated abutments, 20 Neodent and 20 Bionnovation, were tightened to 20 Ncm on their respective external hexagon implants, and divided into four groups (n = 10) according to the screws: coated with Vaseline or uncoated. The removal torque (RT) value of the abutment screw was measured before and after loading. A cyclic loading (0.5 × 106 cycles; 15 Hz) between 11 and 211 N was applied. Means were compared using a repeated-measures ANOVA (α = 0.05). Results: There was no significant difference between coated and uncoated screws (p = 0.822). Significant differences were found between the abutment systems (p < 0.001). There was a significant effect of cyclic loading (p < 0.001). Conclusions: Coated and uncoated screws presented similar effectiveness in maintaining preload. Clinical Relevance: The liquid lubricant used in this study does not influence the stability of Y-TZP single-implant restorations.
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cyclic loading, dental abutments, Dental implants, screw preload, single-tooth, zirconium
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Journal of Prosthodontics, v. 26, n. 8, p. 656-658, 2017.