Souza, José Everaldo de Aquinoda Silva, Nelson Renato França AlvesCoelho, Paulo GuilhermeZavanelli, Adriana Cristina [UNESP]Ferracioli, Renata Cristina Silveira RodriguesZavanelli, Ricardo Alexandre2014-05-272014-05-272011-05-01Journal of Contemporary Dental Practice, v. 12, n. 3, p. 179-186, 2011.1526-3711http://hdl.handle.net/11449/72414Aim: There is little information considering the framework association between cast clasps and attachments. The aim of this study was to evaluate the retention strength of frameworks match circumferential clasps and extra resilient attachment cast in three different alloys (cobalt-chromium, nickel-chromium titanium and commercially pure titanium), using two undercut (0.25 and 0.75 mm) and considering different period of time (0, 1/2, 1, 2, 3, 4 and 5 years). Methods: Using two metallic matrices, representing a partially edentulous mandibular right hemiarch with the first molar crown, canine root and without premolars, 60 frameworks were fabricated. Three groups (n = 20) of each metal were cast and each group was divided into two subgroups (n = 10), corresponding the molar undercut of 0.25 mm and 0.75 mm. The nylon male was positioned at the matrix and attached to the acrylic resin of the prosthetic base. The samples were subjected to an insertion and removal test under artificial saliva environment. Results: The data were analyzed and compared with ANOVAs and Tukey's test at 95% of probability. The groups cast in cobaltchromium and nickel-chromium-titanium had the highest mean retention strength (5.58 N and 6.36 N respectively) without significant difference between them, but statistically different from the group cast in commercially pure titanium, which had the lowest mean retention strength in all the periods (3.46 N). The association frameworks using nickel-chromium-titanium and cobalt-chromium could be used with 0.25 mm and 0.75 mm of undercut, but the titanium samples seems to decrease the retention strength, mainly in the 0.75 mm undercut. The circumferential clasps cast in commercially pure titanium used in 0.75 mm undercuts have a potential risk of fractures, especially after the 2nd year of use. Conclusion: This in vitro study showed that the framework association between cast clasp and an extra resilient attachment are suitable to the three metals evaluated, but strongly suggest extra care with commercially pure titanium in undercut of 0.75 mm. Clinical significance: Frameworks fabricated in Cp Ti tend to decrease in retentive strength over time and have a potential risk of fracture in less than 0.75 mm of undercut.179-186engDental claspsDenture precision attachmentRemovable partial denturechromium derivativecobaltdental alloytitaniumanalysis of variancecomparative studydental proceduredental surgerydentureinstrumentationmaterials testingnonparametric testYoung modulusAnalysis of VarianceChromium AlloysCobaltDental AlloysDental Casting TechniqueDental ClaspsDental Stress AnalysisDenture DesignDenture Precision AttachmentDenture RetentionDenture, OverlayDenture, Partial, RemovableElastic ModulusMaterials TestingStatistics, NonparametricTitaniumTooth Preparation, ProsthodonticArtigo10.5005/jp-journals-10024-1031Acesso aberto2-s2.0-848561477542-s2.0-84856147754.pdf89428048190763928942804819076392