Utilize este identificador para referenciar este registo: http://hdl.handle.net/10284/3359
Título: Detorque Evaluation of Dental Abutment Screws after Immersion in a Fluoridated Artificial Saliva Solution
Autor: Duarte, Antônio
Silva Neto, João
Souza, Júlio
Bonachela, Wellington
Palavras-chave: Dental abutments
dental implants
torque
corrosion
Data: Out-2012
Editora: Wiley
Citação: Journal of Prosthodontics. ISSN 1532-849X. (2012)
Relatório da Série N.º: Journal of Prosthodontics;
Resumo: Purpose: Implant-abutment connections still present failures in the oral cavity due to the loosening of mechanical integrity by detorque and corrosion of the abutment screws. The objective of this study was to evaluate the detorque of dental abutment screws before and after immersion in fluoridated solutions. Materials and Methods: Five commercial implant-abutment assemblies were assessed in this investigation: (C) Conex˜aoR , (E) EmfilsR , (I) INPR , (S) SINR , and (T) Titanium FixR . The implants were embedded in an acrylic resin and then placed in a holding device. The abutments were first connected to the implants and torqued to 20Ncm using a handheld torque meter. The detorque values of the abutments were evaluated after 10 minutes. After applying a second torque of 20 Ncm, implant-abutment assemblies were withdrawn every 3 hours for 12 hours in a fluoridated solution over a period of 90 days. After that period, detorque of the abutments was examined. Scanning electronicmicroscopy (SEM) associated to energy dispersive spectroscopy (EDS)was applied to inspect the surfaces of abutments. Results: Detorque values of systems C, E, and I immersed in the fluoridated solution were significantly higher than those of the initial detorque. ANOVA demonstrated no significant differences in detorque values between designs S and T. Signs of localized corrosion could not be detected by SEM although chemical analysis by EDS showed the presence of elements involved in corrosive processes. Conclusion: An increase of detorque values recorded on abutments after immersion in fluoridated artificial saliva solutions was noticed in this study. Regarding chemical analysis, such an increase of detorque can result from a corrosion layer formed between metallic surfaces at static contact in the implant-abutment joint during immersion in the fluoridated solutions.
Peer review: yes
URI: http://hdl.handle.net/10284/3359
ISSN: 1532-849X
Versão do Editor: http://onlinelibrary.wiley.com/doi/10.1111/j.1532-849X.2012.00941.x/full
Aparece nas colecções:FCS (DCM)- Artigos em Revistas Científicas Internacionais com Arbitragem Científica

Ficheiros deste registo:
Ficheiro Descrição TamanhoFormato 
DUARTE_SOUZA_Detorque evaluation of dental abutments.pdf2,95 MBAdobe PDFVer/Abrir    Acesso Restrito. Solicitar cópia ao autor!


FacebookTwitterDeliciousLinkedInDiggGoogle BookmarksMySpace
Formato BibTex MendeleyEndnote Degois 

Todos os registos no repositório estão protegidos por leis de copyright, com todos os direitos reservados.