Extratos brutos de Hortia oreadica, forneceram quatro derivados do ácido diidrocinâmico, que foram isolados do extrato n-hexânico, bem como as substâncias guianina e dictamina, isoladas do extrato em diclorometano. Os extratos brutos e as substâncias isoladas foram avaliados frente a alguns patógenos bucais com o objetivo de investigar a atividade antibacteriana. Os resultados demonstraram que o extrato bruto n-hexânico e a substância dictamina foram os mais ativos frente ao conjunto de microrganismos avaliados.

Extracts from Hortia oreadica afforded four dihydrocinnamic acid derivatives, isolated from the n-hexane extract, as well as limonoid guyanin and the furoquinoline alkaloid dictamnine, both isolated from the dichloromethane extract. The extracts and the isolated compounds were tested against some oral pathogens, so as to investigate their antibacterial activity. The results showed that the n-hexane extract and the compound dictamnine are the most active against the selected microorganisms.

The international organizations CLSI and EUCAST developed reference methodologies for activity evaluation antifungal. The aim of this work was to compare the recommended methodologies by the CLSI and EUCAST in the antifungal activity evaluation of crude extracts of Azadirachta indica and green propolis. The results showed that the MIC values determined by the EUCAST methodology were smaller than that determined by the CLSI. Nevertheless, both methodologies were satisfactory to detect and evaluate antifungal activity of the crude extracts and isolated compounds. The EUCAST methodology showed advantage by making possible to obtain results in less time.

In this work, the effectiveness of four screening techniques (three techniques of the diffusion method and one microdilution broth method) were compared. Evaluated were the ethanolic and dichloromethanic extracts of Miconia rubiginosa (Melastomataceae) against six standard bacteria (ATCC). The results showed statistical disagreement among the three diffusion techniques. Among the diffusion techniques, the well technique displayed the best result. However the microdilution broth method demonstrated to be the most adequate method to evaluate the antibacterial activity of plant crude extracts and pure compounds when compared to the other methodologies.

O objetivo do presente estudo paralelo, duplo-cego foi o de avaliar os efeitos do uso do metronidazol sistêmico, associado ou não à raspagem e ao alisamento radicular, sobre a doença periodontal crônica do adulto, observados inicialmente, aos 30, 60 e 90 dias. Foram selecionados 12 pacientes, distribuídos em 3 grupos: o primeiro grupo (Grupo I - 22 sítios) foi submetido a raspagem e alisamento radicular (RAR) somente; o segundo grupo (Grupo II - 30 sítios) recebeu RAR e 250 mg de metronidazol (3 X/dia, durante 10 dias); o terceiro grupo (Grupo III - 31 sítios) foi tratado somente com metronidazol. Os parâmetros clínicos avaliados foram profundidade de sondagem (PS), nível de inserção clínica (NI), índices de placa (IPl) e gengival (IG) e sangramento à sondagem (SS). Os pacientes foram submetidos, ainda, à análise microbiológica (BANA) e enzimática ("Pocket Watch"). Os três tratamentos propostos melhoraram significativamente as condições clínicas dos pacientes no início, e nos períodos de 30, 60 e 90 dias, exceto para o nível de inserção clínica. As análises microbiológica e enzimática não apresentaram diferença estatística entre os três grupos para o período de 90 dias (r = 0,7924 e r = 0,7757, respectivamente). Já nos parâmetros clínicos, encontrou-se diferença estatística somente para o índice gengival (p = 0,0261) entre os Grupos I e II e, para a profundidade de sondagem, (p = 0,0124) entre o Grupo I e os outros grupos. Pode-se concluir que o uso do metronidazol sistêmico não produziu efeitos adicionais na microbiota desses pacientes com doença periodontal crônica.

The aim of the present parallel, double-blind investigation was to evaluate the effect of using systemic metronidazole alone or associated to scaling and root planing on adult chronic periodontal disease, monitored at baseline, 30, 60 and 90 days. Twelve subjects were divided into three groups: the first group (Group I - 22 sites) was submitted to scaling and root planing (SRP) alone; the second group (Group II - 30 sites) received SRP and 250 mg of metronidazole (3 times a day for 10 days), and the third group (Group III - 31 sites) was treated with metronidazole alone. The clinical parameters evaluated were probing depth (PD), clinical attachment level (CAL), plaque index (PlI), gingival index (GI) and bleeding upon probing (BP). Microbiological (BANA test) and enzymatic (Pocket Watch) tests were also performed. All three proposed treatments produced significant improvements in clinical conditions of subjects, from baseline, 30, 60 and 90-day period, except for clinical attachment level. The results obtained by microbiological and enzymatic tests did not show statistical differences among the groups for the 90-day period (r = 0.7924 and r = 0.7757, respectively). In relation to clinical parameters, statistical differences among groups were observed only for the gingival index (p = 0.0261) between Groups I and II, and probing depth (p = 0.0124) between Group I and the others. We conclude that the use of systemic metronidazole did not produce additional effects on the microbiological conditions of these patients with chronic periodontal disease.