Subgingival microbiota and immune response modulation of osseointegrable implants / Modulação da microbiota subgengival e resposta imune dos implantes osseointegráveis

ABSTRACT Osseointegrable dental implants are biomaterials made of titanium or other alloys mixed with titanium, which have high biocompatibility and allow osseointegration. However, this process can be modulated by changes in the complex mechanisms between microbiota, immune response and host. The present study aims to present how the immune system-microbiota-host interaction influences the osseointegration process of titanium dental implants and its alloys. A literature review was performed through electronic and manual searches in several databases, including PubMed, LILACS, Google Scholar, SciELO and Web of Science for articles published in the last 20 years in English and Portuguese. The formation of a temporary fibrin matrix on the implants surface after implantation implies the recruitment, adhesion and activity of immune cells at this site, with the release of pro-inflammatory molecules and recruitment of neutrophils. In the second moment, monocytes and macrophages (M1) are recruited, producing, in this step, reactive oxygen species. In the later stage of inflammation, macrophages (M2) help in tissue regeneration with expression of anti-inflammatory cytokines. In addition, the implants surface provides a site for microbial colonization mediated by salivary pellicle and topographical features. Thus, in symbiosis the modulation of the immune response will be favorable to osseointegration. However, the dysbiotic process exacerbates the inflammatory progression modulating the immune response influencing abnormal tissue healing or scar and fibrosis formation, compromising osseointegration. Different conditions of the subgingival microbiota will influence different immunological cascades, generating different cellular responses and positive or negative modulation of the osseointegration process.

RESUMO Os implantes dentários osseointegráveis são biomateriais constituídos de titânio ou outras ligas misturadas com titânio, as quais possuem alta biocompatibilidade e permitem a osseointegração. Esse processo pode ser modulado por alterações nos mecanismos complexos entre microbiota, resposta-imune e hospedeiro. O presente estudo busca apresentar como a interação sistema imune-microbiota-hospedeiro influenciam no processo de osseointegração proveniente de implantes dentários de titânio. Foi realizada uma revisão de literatura através de busca eletrônica e manual em diversas bases de dados, incluindo PubMed, LILACS, Google Acadêmico, SciELO e Web of Science para artigos publicados nos últimos 20 anos em inglês e português. A formação de uma matriz provisória de fibrina na superfície dos implantes após a implantação implica no recrutamento, adesão e atividade das células imunes, com a liberação de moléculas pró-inflamatórias e recrutamento de neutrófilos. No segundo momento, monócitos e macrófagos (M1) são recrutados, produzindo espécies reativas a oxigênio. Já no estágio posterior da inflamação, macrófagos (M2) ajudam na regeneração do tecido com expressão de citocinas anti-inflamatórias. Além disso, a superfície dos implantes oferece um local para colonização microbiana mediada pela película salivar e características topográficas. Assim, em simbiose a modulação da resposta imune vai ser favorável à osseointegração. Contudo, em estado de doença periodontal, o processo disbiótico exacerba a progressão inflamatória modulando a resposta imune influindo em um processo cicatricial comprometendo a osseointegração. Diferentes condições da microbiota subgengival vão influenciar em cascatas imunológicas diferentes gerando respostas celulares diferentes e modulação positiva ou negativa do processo de osseointegração.

Protein interactions with osseointegrable titanium implants

This review aims to present the mechanisms of protein interactions with titanium dental implant surfaces. Methods: the analyses were based on searches of scientific articles available in English and Portuguese in PubMed (MEDLINE), Bireme (LILACS), Scielo, Web of Science and Google Scholar. Results: titanium dental implant treatments success rates (95-98%) are mainly due to the biocompatibility of titanium oxide on the implant surface, surgical techniques adopted, good implants manufacturing processes and biomechanical knowledge of the systems. Studies in past decades has empirically developed implant surfaces with significant changes in morphologies, roughness, wettability, surface energy, chemical composition, and chemical groups density or deposited molecules. These changes promoted better protein adsorption, osteoblast adhesion, and changes in the mechanisms involved in osseointegration. Thus, the time to put the implant in function has been reduced and the success rates have increased. In the osseointegration process, at the nanoscale, there is no contact between the bone and the implant surface, but there is the formation of a protein anchorage between the periosteum and the implant with an interface formed by proteins. In all the reactions between the body and the implant surface, the activities of fibronectin and integrin are essential, since they are responsible for transmitting information to the cell for its differentiation, adhesion and mobility. Conclusion: thus, the analyses of protein-implant interactions are indispensable for a better understanding of the performance of osseointegrated dental implants

The peri-implant ligament: a scoping review

The peri-implant ligament is formed from the interface of bone tissue, through the anchoring of proteins and the surface of the dental implant. In this sense, it is relevant to understand the extent to which this ligament is structured and biomimics the periodontal ligament functions. Aim: The goal of this scoping review is to present and analyze the peri-implant ligament composition and compare the extent to which this ligament is structured and biomimics the periodontal ligament functions. Methods: This scoping review was performed according to the Joanna Briggs Institute methodology for scoping reviews and following the Preferred Reporting Items for Systematic Reviews and Meta-analyses extension for scoping review. Two independent researchers searched Pubmed, Cochrane, Embase, Virtual Health Library, Scielo, Scopus, Web of Science, Brazilian Bibliography of Dentistry, Latin American and Caribbean Literature in Health Sciences, Digital Library of Theses and Dissertations from the University of São Paulo and Portal Capes. Studies published in English, Portuguese and Spanish, over the last 21 years (2000-2021). Results: A total of 330 titles were identified and after applying inclusion and exclusion factors, 27 studies were included in this review. All proteins were identified regarding their tissue function and classified into 6 major protein groups. After that this new protein ligament was compared with the periodontal ligament regarding its function and composition. The main proteins associated with osseointegration, and thus, with the peri-implant ligament are recognized as belonging to the periodontal ligament. Conclusion: This scoping review results suggest evidence of the composition and function of the periimplant ligament. However, variations may still exist due to the existence of several modulants of the osseointegration process

The role of dentistry in the hospital environment: the oral microbiota control as secondary infections prevention

Objective: The purpose of this review is to highlight the oral health care importance on patients in the hospital Intensive Care Unit. Sources of data: The review was performed within articles published in English and Portuguese in the past 11 years, and the search was performed on the following platforms: Google Scholar, PubMed (MEDLINE), Scielo, and Bireme (LILACS). Synthesis of data: When it comes to the hospital environment, especially intensive care units, the lack of dental care could compromise the well evolution of the hospitalized patient. The gap between what would be best proposed to the patient and what, indeed, is done by the current professionals in the intensive care units, highlights the necessity to study this subject more carefully so that there is a resumption of concepts about the expected management pattern, as well as how the multiprofessionalism develops in practice. If the structure cracks in any level, it's often seen the rise of diseases commonly associated with intensive care, such as ventilator-associated pneumonia. The importance of a dentist in the intensive care units could avoid these diseases or, at least, reduce them. Conclusion: From this same perspective, the presence of a dentist working in an integrated way with physicians, nurses, and nursing technicians is valuable, especially concerning oral hygiene for patients using a dental prosthesis.

Objetivo: Esta revisão busca destacar a importância dos cuidados com a saúde bucal em pacientes internados em Unidade de Terapia Intensiva hospitalar. Fonte dos dados: A revisão foi feita com artigos em inglês e português, nos últimos 11 anos, nas plataformas: Google Scholar, Pubmed (MEDLINE), Scielo e Bireme (LILACS). Síntese dos dados: No que se refere ao ambiente hospitalar, principalmente unidades de terapia intensiva, a falta de atendimento odontológico pode comprometer a boa evolução do paciente internado. A lacuna entre o que seria melhor proposto ao paciente e o que de fato é realizado pelos atuais profissionais das unidades de terapia intensiva evidencia a necessidade de estudar criteriosamente esse assunto, a fim de que haja uma retomada dos conceitos sobre o padrão de gestão esperado, bem como a forma como o multiprofissionalismo se desenvolve na prática. Se a estrutura sofrer ruptura em qualquer nível, geralmente ocorre o aumento de doenças comumente associadas à terapia intensiva, como a pneumonia associada ao ventilador. A importância do dentista nas unidades de terapia intensiva pode evitar essas doenças ou, pelo menos, reduzi-las. Conclusão: Sob essa mesma perspectiva, a presença do cirurgião-dentista atuando de forma integrada com médicos, enfermeiros e técnicos de enfermagem é valiosa, sobretudo no tocante a higiene bucal a portadores de prótese oral.

The functional architecture of the stomatognathic system and orofacial aesthetic repositioning during the aging process

Introduction: Facial aging implies special care and personalized treatment. Thus,the new strand of Neomodern Dentistry seeks, through Orofacial Harmonization,the functional and aesthetic balance between the stomatognathic system and thefacial aspect. Objective: This article seeks to disclose, through a literature review, the aesthetical consequences of the stomatognatic system repositioning andorofacial aging. Data source: The present literature review consisted in researchesup to May 2019 using PubMed and Google Academic electronic databases. A 10-year publication limit was applied in the research. No language restriction wasapplied. Inclusion criteria were clinical investigations, books, dissertations, thesisor literature reviews that addressed the topics of interest. Data synthesis: A totalof 231 articles were retrieved from databases. After applying a 10-year publicationlimit, 111 remained and, based on the inclusion and exclusion criteria, 20 articleswere selected and included in this review. Conclusion: Considering the limitationsof the present study, it can be concluded that the aging process is natural andpredictable and can be changeable and malleable through procedures that restorethe support nutrients that were lost. The aesthetics can be achieved as a functionalconsequence of the stomatognathic system repositioning due to orofacial aging.

Introdução: O envelhecimento facial implica em cuidados especiais e um tratamento diferenciado. Desse modo, a nova vertente da Odontologia Neomoderna busca, por meio da Harmonização Orofacial, o equilíbrio funcional e estético entre o aparelho estomatognático e a face. Objetivo: Esse artigo busca compreender, por meio de uma revisão de literatura, as consequências estéticas do reposicionamento do aparelho estomatognático e envelhecimento orofacial. Fonte dos dados: A presente revisão de literatura consistiu em um viés qualitativo nas plataformas PubMed e Google Acadêmico, nos últimos 10 anos, sem restrição de idiomas. Os critérios de inclusão consistiram em estudos clínicos, livros, dissertações, teses ou revisões de literatura que abordavam os tópicos de interesse. Síntese dos dados: Foram recuperados nas bases de dados 231 artigos. Após a aplicação de um limite de publicação de 10 anos, 111 permaneceram e, com base nos critérios de inclusão e exclusão, 20 artigos foram selecionados e incluídos nesta revisão. Conclusão: Com as limitações do presente estudo, pode-se concluir que o processo de envelhecimento é natural e previsível e pode ser mutável e maleável por meio de procedimentos que restauram os nutrientes de suporte perdidos. A estética pode ser alcançada como uma consequência funcional do reposicionamento do sistema estomatognático e do envelhecimento orofacial.

Nutritional influences on oral infections: the oral microbiota modulation

Introduction: The oral microbiota has approximately 700 symbiotic microorganisms responsible for oral health homeostasis. However, changes in oral microbiota can generate dysbiotic processes that favor the worsening of infections such as caries and periodontal disease. These oral infections, in addition to systemic involvement, can compromise the teeth integrity as well as oral health. Thus, inadequate nutrition proves to be a risk factor influencing the prevention and treatment of these oral infections. Objective: This study aims to evidence the nutritional influence on the oral microbiota modulation affecting, in the longterm, the gut microbiota, highlighting the use of probiotics and prebiotics in the treatment of oral infections by a literature review. Synthesis of data : Supplements of certain nutrients and the intake of an adequate diet in macronutrients and micronutrients directly influence nutritional status and consequently in the maintenance of oral-systemic homeostasis. In addition, due to microbial multidrug resistance, therapies using probiotics and prebiotics have been adopted as aids to the treatment of oral infections. Conclusion: Personalized Dentistry must integrate multidisciplinary knowledge of attention for health care. This in addition to knowingwhen to refer and work together with a Nutritionist.

Introdução: A microbiota oral possui aproximadamente 700 microrganismos simbiontes responsáveis pela homeostase da saúde bucal. Contudo, alterações na microbiota oral podem gerar processos disbióticos que favorecem o agravamento de infecções como a cárie e a doença periodontal. Essas infecções orais, além do acometimento sistêmico, podem comprometer a integridade dos dentes e também da saúde bucal. Dessa forma, a alimentação inadequada mostra-se um fator de risco que influência na prevenção e no tratamento dessas infecções orais. Objetivo: Este estudo visa evidenciar a influência nutricional na modulação da microbiota oral afetando a longo prazo a microbiota intestinal, destacando o uso de probióticos e prebióticos no tratamento de infecções orais através de uma revisão de literatura. Síntese de dados: A suplementação de determinados nutrientes e a ingestão de uma dieta adequada em macronutrientes e micronutrientes influenciam diretamente no estado nutricional e consequentemente na manutenção da homeostase oral-sistêmica. Além disso, devido à multirresistência microbiana, terapias com probióticos e prebióticos têm sido adotadas como auxiliares no tratamento de infecções orais. Conclusão: A Odontologia Personalizada deve integrar conhecimentos multidisciplinares de atenção à saúde. Isso além de saber quando encaminhar e trabalhar junto com o Nutricionista.