161 research outputs found
Análise comparativa do desgaste das interfaces titânio/titânio e titânio/zircónia dos conjuntos pilar/implante após envelhecimento
Objectives: Due to its hardness, zirconia abutments may damage the titanium of the implant's connection during its clinical use. This study aimed to assess the wear of the seating platforms of externally hexed titanium implants when connected to zirconia abutments comparing to titanium abutments, after thermocycling and mechanical loading (TCML).Methods: Six BNT (R) S4 external connection implants (Phibo (R) Dental Solutions, Barcelona, Spain) were selected and divided into two groups (n=3): TiCE, screwed to titanium abutments and ZrCE, screwed to zirconia abutments. The samples underwent thermocycling (5000 cycles; 5-55 degrees C) and mechanical loading (1.2 x 106 cycles; 88.8 N; 4 Hz). Before and after TCML, the seating platforms of the implants were analyzed by 3D profilometry in two areas to measure their topography based on the superficial analysis parameters (Sa and Sz) parameters, and were studied by scanning electron microscopy (SEM). Data were statistically analyzed by Mann-Whitney test (p 0.05 and p = 0.059). The abutment's material (titanium/zirconia) did not statistically significantly influence the Sa and Sz values after TCML (p = 0.886> 0.05 and p = 0.200, respectively). However, the SEM analysis reveals a mild wear in some vertices of the hex when connected to zirconia abutments.Conclusions: After simulating five years of clinical use, the externally hexed implants, analyzed by 3D profilometry, showed similar wear patterns in the corresponding seating platforms when connected to zirconia or titanium abutments. The SEM images showed zirconia particles being transferred to the implant, which requires further study. (C) 2016 Sociedade Portuguesa de Estomatologia e Medicina Dentaria.Objetivos
Devido á sua dureza, os pilares de zircĂłnia podem provocar danos sobre o titânio da conexĂŁo do implante durante a utilização clĂnica. O presente trabalho pretendeu avaliar o desgaste das plataformas protĂ©ticas de implantes de titânio com conexĂŁo hexágono externo quando conectados com pilares de zircĂłnia em comparação com pilares de titânio, apĂłs carga cĂclica e termociclagem (TCML).
MĂ©todos
Foram selecionados 6 implantes de conexĂŁo externa BNT® S4 Phibo® Dental Solutions (Barcelona, Espanha), que foram divididos em 2 grupos (n = 3): TiCe aparafusados a pilares de titânio e ZrCe aparafusados a pilares de zircĂłnio. As amostras foram submetidas a TCML (5.000 ciclos; 5–55 °C) e carga cĂclica (1,2 Ă— 106 ciclos; 88,8 N; 4 Hz). Antes e apĂłs TCML, as plataformas de assentamento de conexĂŁo dos implantes foram sujeitas a análise por perfilometria 3 D em 2 localizações para a medição da sua topografia com utilização dos parâmetros de análise superficial (Sa e Sz) e examinadas por microscopia eletrĂłnica de varrimento(MEV). Análise estatĂstica: Mann-Whitney test (p < 0,05).
Resultados
Não se observaram diferenças estatisticamente significativas nos valores de Sa e de Sz entre os implantes no estado inicial e após TCML (p = 0,573 > 0,05 e p = 0,059). O material do pilar (titânio/zircónia) não exerceu influência estatisticamente significativa nos valores de Sa e Sz após TCML (teste U p = 0,886 > 0,05 e p = 0,200, respetivamente). No entanto, a análise por MEV revelou ligeiro desgaste em alguns vértices do hexágono quando conectados com pilares de zircónia.
Conclusões
ApĂłs uma simulação de 5 anos de utilização clĂnica, os implantes com hexágono externo, analisados por perfilometria 3 D, apresentaram padrões de desgaste das plataformas de assentamento equivalentes quando conectados a pilares de zircĂłnia ou de titânio. As imagens de MEV mostram a passagem de partĂculas de zircĂłnia para o implante, aspeto que merece investigação suplementar.Authors gratefully acknowledge the funding of Project NORTE-01-0145-FEDER-000022 - SciTech - Science and Technology for Competitive and Sustainable Industries, cofinanced by Programa Operacional Regional do Norte (NORTE2020), through Fundo Europeu de Desenvolvimento Regional (FEDER)
Microstructured zirconia surfaces modulate osteogenic marker genes in human primary osteoblasts
Evidence-Based Criteria for Differential Treatment Planning of Implant Restorations for the Maxillary Edentulous Patient
Since the introduction of the endosseous concept to North America in 1982, there have been new permutations of the original ad modum Branemark design to meet the unique demands of treating the edentulous maxilla with an implant restoration. While there is a growing body of clinical evidence to assist the student, faculty, and private practitioner in the algorithms for design selection, confusion persists because of difficulty in assessing the external and internal validity of the relevant studies. The purpose of this article is to review clinician- and patient-mediated factors for implant restoration of the edentulous maxilla in light of the hierarchical level of available evidence, with the aim of elucidating the benefit/risk calculus of various treatment modalities
A Comparison of Biomechanical Properties of Implant-Retained Overdenture Based on Precision Attachment Type
Effectiveness of Ball Attachment Systems in Implant Retained- and Supported-Overdentures: A Three- to Five-Year Retrospective Examination
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