Antimicrobial activity of a tissue conditioner combined with a biocide polymer.

BACKGROUND: The characteristics of tissue conditioners support microorganism development that can threaten the health of the dentures user. PURPOSE: The object of this study was to evaluate the effect on antimicrobial activity, roughness and wettability surface of a tissue conditioners material combined with the antimicrobial polymer poly (2-tert-butilaminoethyl) methacrylate (PTBAEMA). MATERIALS AND METHODS: Specimens of tissue conditioner (Coe Soft(®)) were divided into three groups, according to the concentration of PTBAEMA incorporated (0, 10 and 25%). Antimicrobial activity was assessed by adherence assay of one of the microorganisms, Staphylococcus aureus, Streptococcus mutans and Candida albicans. Roughness measurements were made using a Mitutoyo SJ-400, and the mean arithmetic roughness values (Ra) obtained were used for the comparisons. The wettability properties were determined by contact angle measurements. RESULTS: The group containing 25% of PTBAEMA inhibited totally the S. aureus and S. mutans biofilm formation. A significant reduc tion in the S. aureus (Kruskal-Wallis, p = 0,001) and S. mutans (Kruscal-Wallis, p = 0,001) count for 10% PTBAEMA group compared with respective control group. No significant difference was found for C. albicans among PTBAEMA groups and control group (ANOVA, p > 0,05). Incorporating 10 and 25% PTBAEMA increased surface roughness and decreased contact angles (ANOVA and Tukey's post hoc tests, α = 5%). CONCLUSION: Incorporating 10% PTBAEMA into tissue conditioner increases wettability and roughness of tissue conditioner surface; and decreases the adhesion of S. mutans and S. aureus on material surface, but did not exhibit antimicrobial effect against C. albicans. SIGNIFICANCE: The PTBAEMA incorporated into tissue conditioner could prevent biofilm formation on elderly patient.

Effect of a Copaiba Oil-Based Dental Biomodifier on the Inhibition of Metalloproteinase in Adhesive Restoration.

AIM: This study sets out to evaluate the antiproteolytic activity of copaiba oil-based emulsion at the resin/dentin adhesive interface union formed with conventional and self-etching adhesives systems. METHODS: At in situ zymography, 30 teeth were sectioned 2 mm below the enamel-dentin junction; a smear layer was standardized and subdivided into four groups. Gelatin conjugated with fluorescein was used and taken to the fluorescence microscope for evaluation. In cytotoxicity, the Trypan Blue method was used at four different time points. The tested groups were (G1) control with distilled water; (G2) 2% chlorhexidine (CLX); (G3) emulsion based on copaiba oil (EC) 10% + X; (G4) 10% EC + Y; and (G5) EC 10% alkaline. The zymographic assay used the same groups described, but in 30 seconds and 10 and 20 minutes. HT1080 cells were incubated and submitted to electrophoresis. The gel was analyzed using ImageJ software. Mann-Whitney and Kruskal-Wallis tests were used in the statistical analysis (p < 0.05). RESULTS: ECs showed higher cell viability in the cytotoxicity test and showed a significant difference in 10 and 20 minutes. In the zymographic assay, alkaline EC reduced 67% of MMP-2 activity and 44% of MMP-9 compared to 2% chlorhexidine. At in situ zymography in qualitative evaluation, all groups tested showed inhibition of activity in metalloproteinases. CONCLUSION: EC showed activity in the inhibition of metalloproteinases in vitro and in situ, especially the alkaline one. The survey shows the possibility of using ECs, a product from Amazonian biodiversity, as a biomodifier in dentistry.

Adhesive resistance of a copaiba oil-based dentin biomodifier.

This study analyzed the effect of prior application of copaiba oil (CO) emulsions as a dentin cleaning substance on microleakage and microtensile adhesive strength. Twenty-five premolars and sixty-four molars were used for microleakage and microtensile assays. For the microleakage assays, specimens with standard class V cavities were divided (n = 5), according to the tested CO emulsions: CO10%X, CO10%Y, and CO10%Z, as well as chlorhexidine 2% (CHX) and distilled water (DW), as positive and negative controls, respectively. Restorations were performed using the Adper Single Bond® and/or Clearfil SE Bond® systems. Cervical, occlusal, distal and mesial sections were assessed for tracer penetration degree at the composite/tooth interface. For the microtensile assay, healthy molars were divided into sixteen groups, in which artificial caries were induced in half of the groups. Dentin surfaces were treated with CO10%X and CO10%Y, CHX and DW. Microtensile bond strength was measured by fixing each sample to the plate of a universal testing machine operated at a speed of 0.5 mm/minute until failure. Dentin treated with CO10%X showed a lower infiltration rate than dentin treated with the other CO emulsions, CHX2% and DW. According to the microtensile assay, both healthy and affected dentin treated with CO10%X and Adper Single Bond® adhesive system presented higher adhesive strength. CO emulsion, used as a dentin biomodifier, interfered positively in microleakage and improved adhesive strength after acid etching in the Adper Single Bond® adhesive system, or before applying the Clearfil SE Bond® self-etching system.

Dentin Cleaning Ability of an Amazon Bioactive: Evaluation by Scanning Electron Microscopy.

UNLABELLED: The role of dentin cleaning is to remove debris that may impair adaptation and marginal sealing, quantitatively reducing microorganisms. The aim of this study was to investigate through scanning electron microscopy (SEM) the morphology of the dentin surface, cut and treated with copaiba oil emulsions (CO) and suspension of ethanol extract of propolis (EP). Twenty four upper pre-molars teeth, divided into eight groups (n=3), were used: G1: no cleaning, G2: air/water spray, G3: 10% CO, G4: 10% CO + A, G5: 30% CO, G6: 30% CO + A, G7: 1% EP, G8: 2% Chlorhexidine. The specimens were dentin discs (1 mm Ø). The SEM photomicrographs were classified and the results were: G1 - Debris dentin on the entire image / countless microorganisms, G2 and G7 - 50-100 debris / countless microorganisms and G3, G4, G5, G6 and G8 - 0-50 debris / countable microorganisms (50-100 colonies). CONCLUSION: The present results suggest that copaiba oil emulsions (CO) and suspension of ethanol extract of propolis (EP) have feasibility to be used as bioactive dental cleaning agents.

Adhesive resistance of a copaiba oil-based dentin biomodifier

Abstract This study analyzed the effect of prior application of copaiba oil (CO) emulsions as a dentin cleaning substance on microleakage and microtensile adhesive strength. Twenty-five premolars and sixty-four molars were used for microleakage and microtensile assays. For the microleakage assays, specimens with standard class V cavities were divided (n = 5), according to the tested CO emulsions: CO10%X, CO10%Y, and CO10%Z, as well as chlorhexidine 2% (CHX) and distilled water (DW), as positive and negative controls, respectively. Restorations were performed using the Adper Single Bond® and/or Clearfil SE Bond® systems. Cervical, occlusal, distal and mesial sections were assessed for tracer penetration degree at the composite/tooth interface. For the microtensile assay, healthy molars were divided into sixteen groups, in which artificial caries were induced in half of the groups. Dentin surfaces were treated with CO10%X and CO10%Y, CHX and DW. Microtensile bond strength was measured by fixing each sample to the plate of a universal testing machine operated at a speed of 0.5 mm/minute until failure. Dentin treated with CO10%X showed a lower infiltration rate than dentin treated with the other CO emulsions, CHX2% and DW. According to the microtensile assay, both healthy and affected dentin treated with CO10%X and Adper Single Bond® adhesive system presented higher adhesive strength. CO emulsion, used as a dentin biomodifier, interfered positively in microleakage and improved adhesive strength after acid etching in the Adper Single Bond® adhesive system, or before applying the Clearfil SE Bond® self-etching system.

Adhesive resistance of a copaiba oil-based dentin biomodifier

Abstract This study analyzed the effect of prior application of copaiba oil (CO) emulsions as a dentin cleaning substance on microleakage and microtensile adhesive strength. Twenty-five premolars and sixty-four molars were used for microleakage and microtensile assays. For the microleakage assays, specimens with standard class V cavities were divided (n = 5), according to the tested CO emulsions: CO10%X, CO10%Y, and CO10%Z, as well as chlorhexidine 2% (CHX) and distilled water (DW), as positive and negative controls, respectively. Restorations were performed using the Adper Single Bond® and/or Clearfil SE Bond® systems. Cervical, occlusal, distal and mesial sections were assessed for tracer penetration degree at the composite/tooth interface. For the microtensile assay, healthy molars were divided into sixteen groups, in which artificial caries were induced in half of the groups. Dentin surfaces were treated with CO10%X and CO10%Y, CHX and DW. Microtensile bond strength was measured by fixing each sample to the plate of a universal testing machine operated at a speed of 0.5 mm/minute until failure. Dentin treated with CO10%X showed a lower infiltration rate than dentin treated with the other CO emulsions, CHX2% and DW. According to the microtensile assay, both healthy and affected dentin treated with CO10%X and Adper Single Bond® adhesive system presented higher adhesive strength. CO emulsion, used as a dentin biomodifier, interfered positively in microleakage and improved adhesive strength after acid etching in the Adper Single Bond® adhesive system, or before applying the Clearfil SE Bond® self-etching system.

Aesthetic and functional rehabilitation with Alumina: a case report / Reabilitação estética e funcional com Alumina: Relato de caso

A restauração totalmente cerâmica de dentes anteriores é um desafio na atual situação clínica onde há uma variedade de sistemas cerâmicos disponíveis. O objetivo deste estudo é apresentar um relato de caso com a confecção de duas próteses fixas unitárias metal-free em dentes anteriores. Paciente, 30 anos de idade, gênero masculino, estudante, apresentou-se à Faculdade de Odontologia da Universidade Federal do Amazonas, preocupado com a aparência dos dentes. O retratamento endodôntico dos elementos 11 e 12 foi realizado e, em seguida, foram colocados pinos de fibra de vidro. Os preparos dentários foram feitos usando a técnica da silhueta. As coroas foram cimentadas com cimento resinoso. O paciente ficou muito satisfeito com o seu novo sorriso, já que o tratamento proporcionou a reabilitação estética dos dentes anteriores

All-ceramic restoration of anterior teeth is a challenging clinical situation for which a variety of all-ceramic systems are available. The aim of this study is to present a case report of the construction of two single-unit metal-free fixed prostheses in anterior teeth. A 30-year-old male patient came to the Faculty of Dentistry, Federal University of Amazonas, concerned about his teeth. Elements 11 and 12 were endodontically retreated and fiberglass intracanal retainer posts were inserted. Dental crowns were prepared using the silhouette technique. The crowns were cemented with resin cement. The patient was very satisfied with his new smile and the aesthetic rehabilitation of the anterior teeth provided by the treatment

Amazon emulsions as cavity cleansers: antibacterial activity, cytotoxicity and changes in human tooth color

ABSTRACT The copaiba oleoresin, Copaifera multijuga Hayne, Fabaceae, is a phytotherapeutic agent with antimicrobial activity. This study evaluated the antibacterial activity and cytotoxicity of, and tooth color changes caused by four copaiba oil emulsions (Emulsion 1, 10% CM; Emulsion 2, 10% C. multijuga + 1% biotech product; Emulsion 3, 30% C. multijuga; and Emulsion 4, 30% C. multijuga + 1% biotech product). The antibacterial activities against microorganisms causing dental caries (Streptococcus mutans ATCC25175, S. oralis ATCC10557, S. salivarius ATCC7073, and Lactobacillus casei ATCC7469) were tested using three parameters: minimum inhibitory concentration, minimum bactericidal concentration, and cell viability by fluorescence microscopy. The emulsions were assessed for cytotoxicity by means of the hemolytic assay and cell culture (murine fibroblast cells NHI3T3) using Alamar BlueTM. The dentin color change caused by the emulsions was examined at 10 s, 30 s, and 10 min. The emulsions showed antibacterial activity against the microorganisms tested with an MIC of 125 µl/ml. The minimum bactericidal concentration was higher than minimum inhibitory concentration for the tested microorganism and the fluorescence confirmed that the cells were viable at minimum inhibitory concentration values. The emulsions had a hemolytic activity of 71.16% (Emulsion 3) and 44.67% (Emulsion 4) at a concentration of 30 µl/ml. In cell culture assay, NHI-3T3 cells treated with the emulsions showed 6–16% viability. Emulsion 1 caused clinically imperceptible color change in dentin at 10 s (ΔE = 3.21), Emulsion 2 at 30 s (ΔE = 2.70) and 10 min (ΔE = 3.08), and Emulsion 4 at 10 min (ΔE = 3.03). Emulsion 3 caused color change at all times tested. This research documented positive data regarding antibacterial activity, cytotoxicity, and tooth color changes when using copaiba oleoresin emulsions, showing its potential for use in dentistry.

Avaliação da atividade antimicrobiana de um reembasador resiliente combinado a um polímero antimicrobiano sobre a formação de biofilme / Evaluation of antimicrobial activity of the resilient soft liner combined with antimicrobial polymer on biofilm formation

Este estudo avaliou a atividade antimicrobiana de um reembasador resiliente Coe Soft® (RRCS) combinado ao polímero antimicrobiano poli (2 tert-butilaminoetil) metacrilato (PTBAEMA) sobre formação de biofilme de Staphyloccocus aureus, Streptococcus mutans e Candida albicans. Espécimes circulares (15mm x 3mm) do RRCS foram confeccionados (n=27), esterilizados, divididos em três grupos de acordo com as concentrações de PTBAEMA a 0% (controle), 10% e 25% e individualmente inoculados em tubos de falcon contendo 5mL de caldo RPMI para os fungos, TSB para S. aureus e BHI para S. mutans e mantidos em overnight a 37ºC em incubadora com agitação orbital a 75rpm, sendo o S. mutans em microaerofilia. Após a inoculação dos espécimes seguiu-se a formação e maturação do biofilme a 37ºC sob agitação orbital a 75rpm. Em seguida cada espécime foi transferido para tubos contendo PBS e diluições seriadas foram realizadas. Alíquotas dessas diluições foram semeadas em placas de Petri e incubadas a 37ºC por 48h. Os dados obtidos foram transformados em log (UFC+1)/mL, considerando-se α=0,05. Os resultados demonstraram que o grupo contendo 25% de PTBAEMA inibiu completamente a formação de biofilme de S. aureus e S. mutans. Uma redução significativa na contagem de S. aureus e S. mutans (Kruskal- Wallis e Dunn; p=0,001) para o grupo contendo 10% de PTBAEMA foi observada quando comparada aos valores encontrados nos respectivos grupos controle. Para C. albicans não foi encontrada diferença significante entre grupos contendo PTBAEMA e o grupo controle (ANOVA; p>0,05). Conclui-se que os RRCS contendo 10% e 25% de PTBAEMA inibiram a formação de biofilme de S. aureus e S. mutans. Entretanto não teve efeito significante na formação de biofilme de C. albicans

This study evaluated the antimicrobial activity of the resilient reliner Coe Soft ® (RRCS) combined with antimicrobial polymer poly (2-tert butylaminoethyl) methacrylate (PTBAEMA) on Staphylococcus aureus, Streptococcus mutans and Candida albicans biofilm formation. RRCS circular specimens were prepared (n=27), sterilized, divided into three groups according to PTBAEMA concentrations of 0% (control), 10% and 25% and inoculated into individual falcon tubes containing 5 mL of RPMI broth for fungi, TSB for S. aureus and BHI for S. mutans and kept overnight at 37°C with orbital shaking incubator at 75rpm, and S. mutans in microaerophilic. The specimens' inoculations were followed by biofilm formation and its maturation at 37°C under orbital shaking at 75rpm. After that, each sample was transferred to tubes containing PBS and serial dilutions were performed. Aliquots of these dilutions were plated in Petri dishes and incubated at 37°C for 48h. The data were transformed into log (CFU +1)/mL, considering α = 0.05. The results showed that the group containing 25% of PTBAEMA inhibited completely biofilm formation of S. aureus and S. mutans. A significant reduction in counts of S. aureus and S. mutans (Kruskal- Wallis and Dunn; p = 0.001) were found in group containing 10% of PTBAEMA when compared to the values in the corresponding control groups. C. albicans had no significant differences between groups containing PTBAEMA and the control group (ANOVA; p> 0.05). It is concluded that the RRCS containing 10% and 25% PTBAEMA inhibited the biofilm formation of S. aureus and S. mutans. However, no significant effect was found on C. albicans biofilm formation