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Abstract(s)
INTRODUÇÃO: Com a evolução das técnicas e biomateriais de reabilitação oral e
com o aumento da exigência dos pacientes, o recurso ao uso de implantes dentários
para substituição de dentes perdidos tem vindo a aumentar. A osteointegração do
implante depende da superfície do próprio. Além dos aspectos biofuncionais, as
questões estéticas começaram a ganhar relevância e assim surgiram os implantes
cerâmicos (nomeadamente em zircónia) como alternativa aos implantes de titânio.
OBJECTIVOS: Caracterizar a superfície de implantes de titânio, titânio-zircónio e
zircónia, já comercializados, investigando a relação entre características como a
composição química e cristalográfica, a molhabilidade e a rugosidade nos resultados
conhecidos de osteointegração.
MATERIAL E MÉTODOS: Um implante Straumann® Standard Plus SLA® tissue
level de titânio, dois implantes Straumann® Roxolid® SLA® Loxim™ titânio e zircónio
(um bone level e um tissue level), dois implantes Straumann® Pure Ceramic ZLA™ de
zircónia. Os testes serão: difracção de raio-X; perfilometria óptica; medição do ângulo
de contacto; microscopia electrónica de varrimento com espectrometria de energia
dispersiva de raio-X e envelhecimento artificial.
RESULTADOS: Ao DRX todos os implantes confirmaram a existência dos seus
elementos base; o implante de zircónia obteve valores de rugosidade mais baixos na
zona rugosa; a fracção monoclínica do óxido de zircónio apresentou-se superior à
fracção tetragonal antes e após envelhecimento artificial; ao SEM o implante de
zircónia mostrou grãos finos e arredondados.
CONCLUSÃO: Associação entre o aspecto topográfico micrométrico como o
aspecto nanométrico; observou-se a ausência de óxido na superfície do implante de
titânio; verificou-se que a rugosidade do implante de zircónia é inferior aos implantes
de titânio e de titânio-zircónio, sendo este último o que apresentou maiores valores de
rugosidade; após envelhecimento, verificou-se que a percentagem de óxido de
zircónio na fase monoclínica aumentou e se manteve acima da percentagem de fase
tetragonal.
INTRODUCTION: With the evolution of techniques and biomaterials of oral rehabilitation and with the increasing demand from patients, the use of dental implants to replace lost teeth is increasing. The osseointegration of the implant depends upon the surface itself. In addition to the biofunctional aspects, aesthetic considerations began to gain relevance, and thus came the ceramic implants (eg zirconia) as an alternative to titanium implants. PURPOSE: To characterize the surface of titanium implants, titanium-zirconium and zirconia, already commercialized, investigating the relationship between characteristics such as chemical composition and crystallographic, wettability and roughness in the known results of osseointegration. MATERIALS AND METHODS: A Straumann Standard Plus SLA® implant tissue level of titanium, two implants Straumann SLA® Roxolid® Loxim™ titanium and zirconium (a level bone and tissue level), two Straumann zirconia implants Pure Ceramic ZLA™. The tests are: X-ray diffraction; optical profilometry; measurement of contact angle; scanning electron microscopy with energy dispersive X-ray spectrometry and artificial aging. RESULTS: In the X-ray diffraction analysis all implants have confirmed the existence of the base elements; the zirconia implant obtained lower roughness values on the rough area; the monoclinic fraction of zirconium oxide was superior to the tetragonal fraction before and after artificial aging; the zirconia implant on scanning electron microscopy showed fine and rounded grains. CONCLUSION: Association between the topographical micrometer aspect with the nanometer one; we observed the absence of oxide on the surface of titanium implant; it was found that the roughness of the zirconia implant is lower than the titanium and the titanium-zirconium implants, the last one have larger surface roughness values; after aging, it was found that the proportion of zirconium oxide in the monoclinic phase increased and remained above the proportion of tetragonal phase
INTRODUCTION: With the evolution of techniques and biomaterials of oral rehabilitation and with the increasing demand from patients, the use of dental implants to replace lost teeth is increasing. The osseointegration of the implant depends upon the surface itself. In addition to the biofunctional aspects, aesthetic considerations began to gain relevance, and thus came the ceramic implants (eg zirconia) as an alternative to titanium implants. PURPOSE: To characterize the surface of titanium implants, titanium-zirconium and zirconia, already commercialized, investigating the relationship between characteristics such as chemical composition and crystallographic, wettability and roughness in the known results of osseointegration. MATERIALS AND METHODS: A Straumann Standard Plus SLA® implant tissue level of titanium, two implants Straumann SLA® Roxolid® Loxim™ titanium and zirconium (a level bone and tissue level), two Straumann zirconia implants Pure Ceramic ZLA™. The tests are: X-ray diffraction; optical profilometry; measurement of contact angle; scanning electron microscopy with energy dispersive X-ray spectrometry and artificial aging. RESULTS: In the X-ray diffraction analysis all implants have confirmed the existence of the base elements; the zirconia implant obtained lower roughness values on the rough area; the monoclinic fraction of zirconium oxide was superior to the tetragonal fraction before and after artificial aging; the zirconia implant on scanning electron microscopy showed fine and rounded grains. CONCLUSION: Association between the topographical micrometer aspect with the nanometer one; we observed the absence of oxide on the surface of titanium implant; it was found that the roughness of the zirconia implant is lower than the titanium and the titanium-zirconium implants, the last one have larger surface roughness values; after aging, it was found that the proportion of zirconium oxide in the monoclinic phase increased and remained above the proportion of tetragonal phase
Description
Keywords
Cerâmica Implante dentário Zircónia Titânio Caracterização de superfície Ceramic Dental implant Zirconia Titanium Surface characterization