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Jordi Cano-Batalla,Jordi Caballé-Serrano,Josep Cabratosa-TermeOscar Figueras-Álvarez,Herminio García-Roncero 대한치과보철학회 2015 The Journal of Advanced Prosthodontics Vol.7 No.2
PURPOSE In this study, a temporal abutment fixation screw, designed to fracture in a controlled way upon application of an occlusal force sufficient to produce critical micromotion was developed. The purpose of the screw was to protect the osseointegration of immediate loaded single implants. MATERIALS AND METHODS Seven different screw prototypes were examined by fixing titanium abutments to 112 Mozo-Grau external hexagon implants (MG Osseous®; Mozo-Grau, S.A., Valladolid, Spain). Fracture strength was tested at 30° in two subgroups per screw: one under dynamic loading and the other without prior dynamic loading. Dynamic loading was performed in a single-axis chewing simulator using 150,000 load cycles at 50 N. After normal distribution of obtained data was verified by Kolmogorov-Smirnov test, fracture resistance between samples submitted and not submitted to dynamic loading was compared by the use of Student's t-test. Comparison of fracture resistance among different screw designs was performed by the use of one-way analysis of variance. Confidence interval was set at 95%. RESULTS Fractures occurred in all screws, allowing easy retrieval. Screw Prototypes 2, 5 and 6 failed during dynamic loading and exhibited statistically significant differences from the other prototypes. CONCLUSION Prototypes 2, 5 and 6 may offer a useful protective mechanism during occlusal overload in immediate loaded implants.
M. I. Barrena,J. M. Gómez de Salazar,J. M. Vázquez,García-Cano,J. M. Guilemany 대한금속·재료학회 2014 METALS AND MATERIALS International Vol.20 No.4
Protective surface coatings on an AZ91D magnesium alloy were formed in an atmosphere mixture ofnitrogen and 1,1,1,2-tetrafluoroethane (HFC-134a). The surface composition and microstructure were characterizedusing X-ray diffraction analysis and scanning electron microscopy, respectively. The cross-sectionmorphologies of the coatings show that an increase in conversion time results in an increase in thecontinuity and compactness of the coating generated on the surface of the AZ91D alloy. The corrosionresistance tests performed by immersion into 3.5% NaCl solutions were investigated by electrochemicalmeasurements. The results showed that the coated samples had higher corrosion resistance than the uncoatedalloy. On the other hand, the corrosion density of the coated samples decreased by increasing theconversion time by about two orders of magnitude, compared with the un-coated samples. This behaviouris attributed to the formation of a protective surface film constituted mainly for MgF2, together with otherphases. The nature of these phases depends on the process conditions.
Fernando Gonzá,lez-Magañ,a,Hé,ctor Omar Malagó,n-Hidalgo,Eugenio Garcí,a-Cano,Roberto Vilchis-Ló,pez,Adriana Fentanes-Vera,Fernan-Alejandra Ayala-Ugalde 대한구강악안면외과학회 2018 대한구강악안면외과학회지 Vol.44 No.1
Objectives: Airway management in patients with panfacial trauma is complicated. In addition to involving facial lesions, such trauma compromises the airway, and the use of intermaxillary fixation makes it difficult to secure ventilation by usual approaches (nasotracheal or endotracheal intubation). Submental airway derivation is an alternative to tracheostomy and nasotracheal intubation, allowing a permeable airway with minimal complications in complex patients. Materials and Methods: This is a descriptive, retrospective study based on a review of medical records of all patients with facial trauma from January 2003 to May 2015. In total, 31 patients with complex factures requiring submental airway derivation were included. No complications such as bleeding, infection, vascular, glandular, or nervous lesions were presented in any of the patients. Results: The use of submental airway derivation is a simple, safe, and easy method to ensure airway management. Moreover, it allows an easier reconstruction. Conclusion: Based on these results, we concluded that, if the relevant steps are followed, the use of submental intubation in the treatment of patients with complex facial trauma is a safe and effective option.