Effect of unilateral misfit on preload of retention screws of implant-supported prostheses submitted to mechanical cycling

dc.contributorUniversidade Estadual Paulista (UNESP)
dc.creatorAssunção, Wirley Goncalves
dc.creatorBarão, Valentim Adelino Ricardo
dc.creatorDelben, Juliana Aparecida
dc.creatorGomes, Érica Alves
dc.creatorGarcia, Idelmo Rangel
dc.date2014-05-27T11:25:26Z
dc.date2016-10-25T18:33:27Z
dc.date2014-05-27T11:25:26Z
dc.date2016-10-25T18:33:27Z
dc.date2011-01-01
dc.date.accessioned2017-04-06T01:48:56Z
dc.date.available2017-04-06T01:48:56Z
dc.identifierJournal of Prosthodontic Research, v. 55, n. 1, p. 12-18, 2011.
dc.identifier1883-1958
dc.identifierhttp://hdl.handle.net/11449/72248
dc.identifierhttp://acervodigital.unesp.br/handle/11449/72248
dc.identifier10.1016/j.jpor.2010.05.002
dc.identifier2-s2.0-78649726255
dc.identifierhttp://dx.doi.org/10.1016/j.jpor.2010.05.002
dc.identifier.urihttp://repositorioslatinoamericanos.uchile.cl/handle/2250/893137
dc.descriptionPurpose: The aim of this study was to evaluate the effect of different levels of unilateral angular misfit on preload maintenance of retention screws of single implant-supported prostheses submitted to mechanical cycling. Materials and methods: Premachined UCLA abutments were cast with cobalt-chromium alloy to obtain 48 crowns divided into four groups (n=12). The crowns presented no misfit in Group A (control group) and unilateral misfits of 50μm, 100μm and 200μm in the groups B, C and D, respectively. The crowns were attached to external hexagon implants with a titanium retention screw with torque of 30N/cm. Oblique loading of 130N at 2Hz was applied on each replica, totalizing 5×104 and 1×106cycles. Detorque values were measured initially and after each cycling period. Data were evaluated by analysis of variance and Tukey's HSD test (p<0.05). Results: All groups presented reduced initial detorque values (p< 0.05) in comparison to the insertion torque (30. ± 0.5. N/cm) and Group A (25.18. N/cm) exhibited the lowest reduction. After mechanical cycling, all groups presented detorque values from 19.5. N/cm to 22.38. N/cm and the mechanical cycling did not statistically influence the detorque values regardless the misfit level of the replicas. Conclusion: The unilateral misfit influenced the preload maintenance only before mechanical cycling. The mechanical cycling did not influence the torque reduction. © 2010 Japan Prosthodontic Society.
dc.languageeng
dc.relationJournal of Prosthodontic Research
dc.rightsinfo:eu-repo/semantics/closedAccess
dc.subjectDental implant
dc.subjectImplant-supported prosthesis
dc.subjectMechanical cycling
dc.subjectMisfit
dc.subjectPreload
dc.subjectchromium derivative
dc.subjectdental alloy
dc.subjectdental care
dc.subjectdenture
dc.subjectmechanical stress
dc.subjectmethodology
dc.subjectprosthesis
dc.subjecttooth crown
dc.subjecttooth prosthesis
dc.subjecttorque
dc.subjectChromium Alloys
dc.subjectCrowns
dc.subjectDental Abutments
dc.subjectDental Alloys
dc.subjectDental Prosthesis Design
dc.subjectDental Prosthesis Retention
dc.subjectDental Prosthesis, Implant-Supported
dc.subjectDental Stress Analysis
dc.subjectProsthesis Fitting
dc.subjectStress, Mechanical
dc.subjectTorque
dc.titleEffect of unilateral misfit on preload of retention screws of implant-supported prostheses submitted to mechanical cycling
dc.typeOtro


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