Effect of microthread presence and restoration design (screw versus cemented) in dental implant reliability and failure modes

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dc.contributor.authorAlmeida, Erika O. [UNESP]
dc.contributor.authorFreitas Júnior, Amilcar C.
dc.contributor.authorBonfante, Estevam A.
dc.contributor.authorRocha, Eduardo Passos [UNESP]
dc.contributor.authorSilva, Nelson R. F. A.
dc.contributor.authorCoelho, Paulo G.
dc.contributor.institutionNew York University College of Dentistry
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.contributor.institutionSchool of Dentistry - UnP
dc.contributor.institutionPostgraduate Program in Dentistry UNIGRANRIO University
dc.contributor.institutionCollege of Dentistry
dc.date.accessioned2014-05-27T11:28:20Z
dc.date.available2014-05-27T11:28:20Z
dc.date.issued2013-02-01
dc.description.abstractObjectives: This study evaluated the reliability and failure modes of implants with a microthreaded or smooth design at the crestal region, restored with screwed or cemented crowns. The postulated null hypothesis was that the presence of microthreads in the implant cervical region would not result in different reliability and strength to failure than smooth design, regardless of fixation method, when subjected to step-stress accelerated life-testing (SSALT) in water. Materials and methods: Eighty four dental implants (3.3 × 10 mm) were divided into four groups (n = 21) according to implant macrogeometric design at the crestal region and crown fixation method: Microthreads Screwed (MS); Smooth Screwed (SS); Microthreads Cemented (MC), and Smooth Cemented (SC). The abutments were torqued to the implants and standardized maxillary central incisor metallic crowns were cemented (MC, SC) or screwed (MS, SS) and subjected to SSALT in water. The probability of failure versus cycles (90% two-sided confidence intervals) was calculated and plotted using a power law relationship for damage accumulation. Reliability for a mission of 50,000 cycles at 150 N (90% 2-sided confidence intervals) was calculated. Differences between final failure loads during fatigue for each group were assessed by Kruskal-Wallis along with Benferroni's post hoc tests. Polarized-light and scanning electron microscopes were used for failure analyses. Results: The Beta (β) value (confidence interval range) derived from use level probability Weibull calculation of 1.30 (0.76-2.22), 1.17 (0.70-1.96), 1.12 (0.71-1.76), and 0.52 (0.30-0.89) for groups MC, SC, MS, and SS respectively, indicated that fatigue was an accelerating factor for all groups, except for SS. The calculated reliability was higher for SC (99%) compared to MC (87%). No difference was observed between screwed restorations (MS - 29%, SS - 43%). Failure involved abutment screw fracture for all groups. The cemented groups (MC, SC) presented more abutment and implant fractures. Significantly higher load to fracture values were observed for SC and MC relative to MS and SS (P < 0.001). Conclusion: Since reliability and strength to failure was higher for SC than for MC, our postulated null hypothesis was rejected. © 2012 John Wiley & Sons A/S.en
dc.description.affiliationDepartment of Biomaterials and Biomimetics, Director for Research Department of Periodontology and Implant Dentistry New York University College of Dentistry, New York, NY
dc.description.affiliationDepartment of Dental Material and Prosthodontics Araçatuba School of Dentistry Sao Paulo State University - UNESP, Sao Paulo
dc.description.affiliationPostgraduate Program in Dentistry Potiguar University School of Dentistry - UnP, Natal, RN
dc.description.affiliationPostgraduate Program in Dentistry UNIGRANRIO University, Duque de Caxias RJ
dc.description.affiliationDepartment of Prosthodontics New York University College of Dentistry, New York, NY
dc.description.affiliationUnespDepartment of Dental Material and Prosthodontics Araçatuba School of Dentistry Sao Paulo State University - UNESP, Sao Paulo
dc.format.extent191-196
dc.identifierhttp://dx.doi.org/10.1111/j.1600-0501.2012.02437.x
dc.identifier.citationClinical Oral Implants Research, v. 24, n. 2, p. 191-196, 2013.
dc.identifier.doi10.1111/j.1600-0501.2012.02437.x
dc.identifier.issn0905-7161
dc.identifier.issn1600-0501
dc.identifier.lattes3383392287039820
dc.identifier.scopus2-s2.0-84872667747
dc.identifier.urihttp://hdl.handle.net/11449/74507
dc.identifier.wosWOS:000313834500010
dc.language.isoeng
dc.relation.ispartofClinical Oral Implants Research
dc.relation.ispartofjcr4.305
dc.relation.ispartofsjr2,462
dc.relation.ispartofsjr2,462
dc.rights.accessRightsAcesso restrito
dc.sourceScopus
dc.subjectDental implant
dc.subjectFractography
dc.subjectReliability
dc.subjectStep-stress accelerated life-testing
dc.subjectWeibull
dc.titleEffect of microthread presence and restoration design (screw versus cemented) in dental implant reliability and failure modesen
dc.typeArtigo
dcterms.licensehttp://olabout.wiley.com/WileyCDA/Section/id-406071.html
unesp.author.lattes3383392287039820
unesp.campusUniversidade Estadual Paulista (Unesp), Faculdade de Odontologia, Araçatubapt

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