Role of Candida species from HIV infected children in enamel caries lesions: an in vitro study

Objectives This study analyzed the capacity of Candida spp. from dental biofilm of HIV infected (HIV+) children to demineralize primary molar enamel in vitro by Transversal Microhardness (TMH), Polarized Light Microscopy (PLM) and the quantity of calcium ions (Ca2+) released from the enamel. Material and Methods Candida spp. samples were isolated from the supragingival biofilm of HIV+ children. A hundred and forty (140) enamel blocks were randomly assigned to six groups: biofilm formed by C. albicans (Group 1); mixed biofilm formed by C. albicans and C. tropicalis (Group 2); mixed biofilm formed by C. albicans and C. parapsilosis (Group 3); mixed biofilm formed by C. albicans, C. parapsilosis and C. glabrata (Group 4); biofilm formed by C. albicans ATCC (Group 5) and medium without Candida (Group 6). Enamel blocks from each group were removed on days 3, 5, 8 and 15 after biofilm formation to evaluate the TMH and images of enamel were analyzed by PLM. The quantity of Ca2+ released, from Groups 1 and 6, was determined using an Atomic Absorption Spectrophotometer. The SPSS program was used for statistical analysis and the significance level was 5%. Results TMH showed a gradual reduction in enamel hardness (

Relação entre biofilme, atividade de cárie e gengivite em crianças HIV+

The utilization of medicines to treat HIV-infected children has been promoting a decrease in the prevalence of soft-tissue oral lesions, as years pass by. In contrast, it has been observed that the experience of caries and gingivitis is constant in this population, mostly because of the chronic influence of some factors involved in the HIV-infection process, such as the chronic utilization of sweetened liquid medicines and carbohydrate-enriched diet, as well as frequent episodes of hospitalization. So, the purpose of this study was to evaluate if the quality and quantity of biofilm are important factors in the activity of dental caries and gingivitis, also in this special group. After examination of the biofilm (biofilm index - Ribeiro23, 2000), the activity of caries and gingivitis was assessed in 56 children, aging from 0 to 14 years, who were patients with definitive diagnosis of HIV infection. It was observed that only 7 subjects (12.5%) did not present with clinically visible biofilm, and 33 (58.9%) presented with gingivitis, with the average of 4.44 bleeding sites. As to dental caries, 73.2% of the patients presented with active carious lesions. A strong correlation was verified between Biofilm Index, gingival status and active carious lesions (Spearmans correlation test, r s = +0.57 and r s = +0.49, respectively). It was concluded that, also in HIV-infected children, the quality and quantity of biofilm over the dental surfaces are important etiologic factors related to the activity of caries and gingivitis. Biofilm should, thus, be controlled in order to reestablish the oral health of HIV-infected children.A utilização de terapia medicamentosa em crianças infectadas pelo HIV (HIV+) vem promovendo a diminuição na prevalência de manifestações bucais em tecidos moles ao longo dos anos. Entretanto, observa-se uma constância na experiência de cárie e gengivite desta população, sobretudo devido à influência crônica de alguns fatores envolvidos no processo da infecção pelo HIV, como uso prolongado de medicamentos líquidos açucarados, dieta rica em carboidratos e repetidos episódios de internação. Assim, o objetivo do presente estudo foi avaliar se a qualidade e quantidade de biofilme representam um fator importante na atividade da doença cárie e gengivite neste grupo em especial. Após exame do biofilme (índice de biofilme; Ribeiro23, 2000), da atividade de cárie e gengivite de 56 crianças, de 0 a 14 anos, pacientes com diagnóstico definitivo de infecção pelo HIV, observou-se que somente 7 (12,5%) não apresentavam biofilme visível clinicamente e 33 (58,9%) apresentavam gengivite, com, em média, 4,44 superfícies com sangramento. Quanto à doença cárie, 73,2% das crianças apresentavam lesões cariosas ativas. Verificou-se ainda a correlação entre o índice de biofilme, o estado gengival e a atividade das lesões cariosas (teste de correlação de Spearman, r s = +0,57 e r s = +0,49, respectivamente). Conclui-se, que nas crianças HIV+ avaliadas, a qualidade e quantidade de biofilme sobre a superfície dental representam um importante fator na etiologia da atividade das doenças cárie e gengivite, podendo e devendo este ser trabalhado para que seja possível restabelecer a saúde bucal destas crianças

Model resin composites incorporating ZnO-NP: activity against S. mutans and physicochemical properties characterization

Although resin composites are widely used in the clinical practice, the development of recurrent caries at composite-tooth interface still remains as one of the principal shortcomings to be overcome in this field. Objectives: To evaluate the activity against S. mutans biofilm of model resin composites incorporating different concentrations of ZnO-nanoparticles (ZnO-NP) and characterize their physicochemical properties. Materials and Methods: Different concentrations of ZnO-NP (wt.%): E1=0, E2=0.5, E3=1, E4=2, E5=5 and E6=10 were incorporated into a model resin composite consisting of Bis-GMA-TEGDMA and barium borosilicate particles. The activity against S. mutans biofilm was evaluated by metabolic activity and lactic acid production. The following physicochemical properties were characterized: degree of conversion (DC%), flexural strength (FS), elastic modulus (EM), hardness (KHN), water sorption (Wsp), water solubility (Wsl) and translucency (TP). Results: E3, E4, E5 and E6 decreased the biofilm metabolic activity and E5 and E6 decreased the lactic acid production (p<0.05). E6 presented the lowest DC% (p<0.05). No significant difference in FS and EM was found for all resin composites (p>0.05). E5 and E6 presented the lowest values of KHN (p<0.05). E6 presented a higher Wsp than E1 (p<0.05) and the highest Wsl (p<0.05). The translucency significantly decreased as the ZnO- NP concentration increased (p<0.05). Conclusions: The incorporation of 2 – 5 wt.% of ZnO-NP could endow antibacterial activity to resin composites, without jeopardizing their physicochemical properties

Construção do acolhimento com classificação de risco em uma Unidade Básica de Saúde

O estudo tem como objetivo descrever a experiência de acadêmicos de enfermagem no desenvolvimento do Acolhimento com Classificação de Risco para profissionais e usuários de uma Unidade Básica de Saúde. Trata-se de um relato de experiência que traz a ação desenvolvida por acadêmicos do 8º semestre do Módulo de Internato 1 do Curso de Graduação em Enfermagem da Universidade Estadual Vale do Acaraú na implantação do Acolhimento com Classificação de Risco em uma Unidade Básica de Saúde da região noroeste do estado do Ceará. As ações foram estruturadas em 6 encontros onde 2 envolveram os profissionais da equipe de enfermagem, 1 englobou todos os trabalhadores da unidade básica e 3 abordaram os usuários do serviço onde a partir de temáticas e materiais estudados anteriormente possibilitaram a construção de dispositivos facilitadores do aprendizado dos participantes. Os resultados desse estudo são apresentados e discutidos em dois tópicos essenciais para a elaboração das metodologias: organização do trabalho e transformação das práticas profissionais; e potencialização no atendimento da/para população. As estratégias de educação permanente com os profissionais da unidade e educação em saúde com os usuários adotadas na experiência constituíram-se como potencializadoras na transformação das práticas do trabalho

Editorial: Omics Research for Pediatric Dentistry in Health and Disease

Multi-omics research holds great promise to fill our understanding of pediatric oral health and disease in a concerted manner, ranging from the provision of diagnosis, monitoring, and personalized medicine to the identification of prognostic biomarkers and novel therapeutic targets. This Research Topic aimed to employ multi-omics research to highlight the current understanding of the relationship between the oral microbiome composition, activity and interactions, and children’s oral and systemic health. This knowledge, combining human genome analysis, oral microbiota omics investigation and conditions in health and disease, will provide valuable information on the functional and metabolic changes in diverse pathological states, as well as the identification of molecular signatures, which could lead to precise therapies considering person-centered care in dentistry and medicine. The articles included in this collection show evidence of the potential predictive relationship between the oralmicrobiota, biofilmand childhood diseases, suggesting that the oralmicrobiome can be used as a target for disease diagnosis and novel approaches to maintain children’s health

Physicochemical properties and biological effects of quaternary ammonium methacrylates in an experimental adhesive resin for bonding orthodontic brackets

Fixed orthodontic appliances may lead to biofilm accumulation around them that may increase caries risk. This study aimed to evaluate the influence of quaternary ammonium methacrylates (QAMs) on the physicochemical properties, cytotoxicity, and antibacterial activity of adhesive resins for orthodontic purposes. Methodology: A base resin was prepared with a comonomer blend and photoinitiator/co-initiator system. Two different QAMs were added to the base adhesive: dimethylaminododecyl methacrylate at 5 wt.% (DMADDM) or dimethylaminohexadecyl methacrylate (DMAHDM) at 10 wt.%. The base adhesive, without QAMs, (GC) and the commercial Transbond™ XT Primer 3M (GT) were used as control. The resins were tested immediately and after six months of aging in the water regarding the antibacterial activity and shear bond strength (SBS). The antibacterial activity was tested against Streptococcus mutans via metabolic activity assay (MTT test). The groups were also tested for the degree of conversion (DC) and cytotoxicity against keratinocytes. Results:The resins containing QAM showed antibacterial activity compared to the commercial material by immediately reducing the metabolic activity by about 60%. However, the antibacterial activity decreased after aging (p<0.05). None of the groups presented any differences for SBS (p>0.05) and DC (p>0.05). The incorporation of DMADDM and DMAHDM significantly reduced the keratinocyte viability compared to the GT and GC groups (p<0.05). Conclusion: Both adhesives with QAMs showed a significant reduction in bacterial metabolic activity, but this effect decreased after water aging. Lower cell viability was observed for the group with the longer alkyl chain-QAM, without significant differences for the bonding ability and degree of conversion. The addition of QAMs in adhesives may affect the keratinocytes viability, and the aging effects maybe decrease the bacterial activity of QAM-doped materials

Prevalence of caries and its correlation with clinical and immunological classification in HIV-infected children

Este estudo tem como objetivo determinar a experiência de cárie em crianças infectadas pelo HIV, correlacionada com a classificação clínica e imunológica (CDC³, 1994). Participaram da pesquisa 92 crianças (50 meninas e 42 meninos), com média de idade de 5,77 ± 3,31 anos (6 meses a 13 anos), com diagnóstico definitivo para o HIV, todos pacientes com atendimento ambulatorial. Foi realizado exame bucal para determinar os índices ceo/CPOD e os dados de história médica foram coletados dos prontuários médicos. Na dentição decídua de crianças mais jovens (até 5 anos), apesar de a prevalência de cárie ter apresentado valores maiores naquelas mais comprometidas clínica e imunologicamente, não houve diferença estatisticamente significante entre as diversas categorias de classificação. Nas crianças de maior idade, isto também foi observado, apesar de terem sido encontrados valores de CPOD maiores nas crianças mais doentes.This research aims to determine the relationship between the prevalence of caries and clinical and immunological classification in HIV-infected children. Ninety-two outpatients (42 male and 50 female subjects) with definitive diagnosis of HIV infection took part in this research. The patients were examined in order to determine the prevalence of caries (dmf and DMFT indexes), and medical data were collected from their medical records. The mean age of the subjects was 5.77 years. Although no statistical differences were found, young patients (up to 5 years old) had more caries when they were more clinically and immunologically compromised. The same fact was observed regarding older children