Tratamento biomimético de discos e implantes de titânio com alendronato. Caracterização topográfica, estudo histométrico e imunoistoquímico em coelhos
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Data
2018-03-02
Autores
Figueira Júnior, Heldo Cesar [UNESP]
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Editor
Universidade Estadual Paulista (Unesp)
Resumo
Tratamentos de superfície de materiais implantáveis no corpo humano são analisados incansavelmente dentro das áreas da saúde. É comum ser observado em artigos científicos o emprego de um recente e desconhecido biomaterial sendo analisado para este fim. O objetivo deste estudo foi avaliar o emprego do alendronato sobre a caracterização topográfica de implantes e discos de titânio in vitro, e sobre a superfície de implantes de titânio inseridos em coelhos após levantamento de seio maxilar, correlacionando as respostas biológicas e físicas do tratamento comparadas a protocolos bem estabelecidos da implantodontia. Utilizou-se seis discos e vinte e seis implantes dentários ambos de titânio comercialmente puro. Para as análises topográficas, discos e implantes se dividiram em 2 grupos de 3 amostras: Grupo CTL, submetidos a subtração ácida e grupo ALD, submetidos a tratamento biomimético com alendronato. Para os testes em animais, 5 implantes foram distribuídos por grupo, CTL e ALD, com intervalos de eutanásia de 7 e 40 dias. Após microscopia eletrônica de varredura, análise de espectroscopia por energia dispersiva, análise do ângulo de contato com a água, de energia livre de superfície e da presença de sítios doares de elétrons (base de Lewis), os grupos ALD apresentaram resposta satisfatória frente aos processos aceitos em saúde, sendo superiores em todas as análises. A resposta histométrica também foi mensurada resultando em maior tecido ósseo nas análises ELCOI e AON nos grupos ALD 40 dias. A discreta presença do TRAP aos 40 dias se refere a baixa reabsorção óssea no momento testado, fator relacionado ao uso de um bisfosfonato à nível local. A osteocalcina em 7 dias sugere uma atividade celular propícia à neoformação. Os tratamentos de biomiméticos são válidos uma vez que, frente aos testes realizados, melhoram a interação dos implantes a nível celular. O alendronato pode ser empregado para os fins propostos resultando em melhora do processo de reparo ósseo.
Surface treatments of implantable materials in the human body are analyzed tirelessly within the health areas. It is common to observe in scientific articles the use of a recent and unknown biomaterial being analyzed for this purpose. The objective of this study was to evaluate the use of alendronate on the t opographic c haracterization of implants and titanium discs in vitro , and over the surface of titanium implants inserted into rabbits after maxillary sinus lift, correlating the biological and physical responses of the treatment compared to well established implantology protocols. It was used six disks and twenty - six commercially pure titanium dental implants. For the topographic analyzes, disks and implants were divided into 2 groups of 3 samples: CTL group, submitted to acid subtraction and ALD group, submi tted to biomimetic treatment with alendronate. For the animal tests, 5 implants were distributed per group, CTL and ALD, with euthanasia intervals of 7 and 40 days. After scanning electron microscopy, analysis of energy dispersive spectroscopy, analysis of the water contact angle, free surface energy and the presence of electron ́s donor sites (Lewis base), the ALD groups showed a satisfactory response to the accepted processes in health, being superior in all the analyzes. The histometric response was also measured resulting in increased bone tissue in the ELCOI and AON analyzes in the ALD 40 days’ group. The discrete presence of TRAP at 40 days refers to low bone resorption at the time tested, a factor related to the use o f a bisphosphonate . Osteocalcin in 7 days suggests a cellular activity conducive to neoformation. Biomimetic treatments are valid since, given the tests performed, they improve the interaction at the cellular level. Alendronate can be used for the proposed applications resulting in a better bone repair process.
Surface treatments of implantable materials in the human body are analyzed tirelessly within the health areas. It is common to observe in scientific articles the use of a recent and unknown biomaterial being analyzed for this purpose. The objective of this study was to evaluate the use of alendronate on the t opographic c haracterization of implants and titanium discs in vitro , and over the surface of titanium implants inserted into rabbits after maxillary sinus lift, correlating the biological and physical responses of the treatment compared to well established implantology protocols. It was used six disks and twenty - six commercially pure titanium dental implants. For the topographic analyzes, disks and implants were divided into 2 groups of 3 samples: CTL group, submitted to acid subtraction and ALD group, submi tted to biomimetic treatment with alendronate. For the animal tests, 5 implants were distributed per group, CTL and ALD, with euthanasia intervals of 7 and 40 days. After scanning electron microscopy, analysis of energy dispersive spectroscopy, analysis of the water contact angle, free surface energy and the presence of electron ́s donor sites (Lewis base), the ALD groups showed a satisfactory response to the accepted processes in health, being superior in all the analyzes. The histometric response was also measured resulting in increased bone tissue in the ELCOI and AON analyzes in the ALD 40 days’ group. The discrete presence of TRAP at 40 days refers to low bone resorption at the time tested, a factor related to the use o f a bisphosphonate . Osteocalcin in 7 days suggests a cellular activity conducive to neoformation. Biomimetic treatments are valid since, given the tests performed, they improve the interaction at the cellular level. Alendronate can be used for the proposed applications resulting in a better bone repair process.
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Palavras-chave
Substitutos ósseos, Biomateriais, Implantes dentários, Alendronato, Bone substitutes