Atividade antimicrobiana do PMCC, por contato direto e vapor, frente ao Enterococcus faecalis e ao Staphylococcus aureus / PMCC antimicrobial activity, by direct contact and vapor, against Enterococcus faecalis and Staphylococcus aureus

O objetivo deste trabalho foi avaliar a atividade antimicrobiana do paramonoclorofenol canforado (PMCC), por contato direto e vapor contra o Enterococcus faecalis e Staphylococcus aureus. O método empregado foi o de difusão em ágar. Utilizaram-se dez dentes humanos extraidos (caninos superiores e inferiores, pré-molares superiores e inferiores), que foram transfixados a placas de Petry com resina acrílica auto-polimerizável, de forma que as coroas dentais ficassem acima da tampa destas placas. Ao redor dos ápices radiculares foi colado um cilindro de vidro de, aproximadamente, 5mm de diâmetro e 1,5 cm de altura. O teste por contato direto foi realizado com discos de papel filtro embebidos em 3µL de PMCC colocados diretamente sobre o meio de cultura inoculado com os microrganismos. Para o teste por vapor, o PMCC foi levado ao interior do canal com um cone de papel absorvente #40, onde permaneceu por 24 horas. Os resultados revelaram que o medicamento apresentou efeito antimicrobiano após contato direto com as culturas, formando halos de inibição bacteriana. Em relação aos vapores liberados pelo produto, pôde-se constatar que não houve nenhuma ação por vapor quando o fármaco esteve no canal radicular, pois houve crescimento bacteriano próximo a região do ápice radicular.

The aim of this study was to evaluate antibacterial activity of the canphorated paramonochorophenol (PMCC) by direct contact and vapor against Enterococcus faecalis and Staphylococcus aureus. The test of agar difusion was the method used. It were used human extracted teeth (maxillary and mandibulary canines and maxillary and mandibulary pre-molars) that were fixed on Petri slabs by acrylic resin in order to keep the tooth crown above of the slab cover. A glass cylinder (5 mm of diameter and 1,5 cm of height) was fixed around the root apex was fixed. The direct contact test was realized by papers disks were soaked with PMCC (3 µL) that put directly in contact with the agar. For the steam test, we put a paper point into canal root soaked with PMCC (3µL) that remained per 24 hours. The results showed that the PMCC was effective against micoorganisms when in direct contact with them, with zones of bacterial inhibition. Regarding the release of vapor by PMCC into de canal root, there was no any reaction, because there was bacterial growth.

Histopathological evaluation of root canal filling materials for primary teeth

This study aimed to assess the response of apical and periapical tissues of dogs' teeth after root canal filling with different materials. Forty roots from dogs' premolars were prepared biomechanically and assigned to 4 groups filled with: Group I: commercial calcium hydroxide and polyethylene glycol-based paste (Calen®) thickened with zinc oxide; Group II: paste composed of iodoform, Rifocort® and camphorated paramonochlorophenol; Group III: zinc oxide-eugenol cement; Group IV: sterile saline. After 30 days, the samples were subjected to histological processing. The histopathological findings revealed that in Groups I and IV the apical and periapical regions exhibited normal appearance, with large number of fibers and cells and no resorption of mineralized tissues. In Group II, mild inflammatory infiltrate and mild edema were observed, with discrete fibrogenesis and bone resorption. Group III showed altered periapical region and thickened periodontal ligament with presence of inflammatory cells and edema. It may be concluded that the Calen paste thickened with zinc oxide yielded the best tissue response, being the most indicated material for root canal filling of primary teeth with pulp vitality.

O objetivo deste estudo foi avaliar a resposta dos tecidos apicais e periapicais de dentes de cães, após obturação dos canais radiculares com diferentes materiais indicados para dentes decíduos. Foram utilizados pré-molares de cães, totalizando 40 raízes que, após pulpectomia e preparo biomecânico, foram divididas em 4 grupos, nos quais os canais radiculares foram obturados com os seguintes materiais: Grupo I - pasta comercial composta de hidróxido de cálcio e polietileno glicol 400 (Calen®) espessada com óxido de zinco; Grupo II - pasta composta de iodofórmio, Rifocort® e paramonoclorofenol canforado; Grupo III - cimento de óxido de zinco e eugenol; e Grupo IV - solução salina. Decorridos 30 dias, as peças foram submetidas ao processamento histológico. De acordo com os resultados da análise histopatológica observou-se que nos Grupos I e IV as regiões apical e periapical apresentaram aspecto de normalidade, com grande número de fibras e células e ausência de reabsorção dos tecidos mineralizados. No Grupo II observou-se infiltrado inflamatório e edema leves, com discreta fibrogênese e reabsorção óssea. O Grupo III apresentou alteração na região periapical e ligamento periodontal ampliado, com presença de células inflamatórias e edema. Os resultados obtidos permitiram concluir que a pasta Calen espessada com óxido de zinco apresentou a melhor resposta tecidual, sendo a mais indicada para a obturação de canais radiculares de dentes decíduos com vitalidade pulpar.

Coronal leakage of four intracanal medications after exposure to human saliva in the presence of a temporary filling material.

Aim: To determine the time required for the recontamination of root canals medicated with four different materials. Materials and Methods: A total of 60 intact, caries-free, human single-rooted teeth with straight roots were selected for this study. After chemo-mechanical preparation they must be changed in the specimens into seven groups: 10 teeth medicated with calcium hydroxide (Ca(OH) 2) + Camphorated paramonochlorophanol (CPMC) (G.1); 10 medicated with 2.5% Sodium hypochlorite (NaOCL) (G.2); 10 medicated with 2% Chlorhexidine gluconate (CHX) in gel (G.3); 10 medicated with 2% CHX in gel + Ca(OH) 2 (G.4); 10 without intracanal medicament and sealed with a coronal temporary filling (G.5). Five teeth were without intracanal medicament and coronally unsealed, used as the positive control group (PC) (G.6) and 5 teeth with intact crowns used as the negative control group (NC) (G.7). Glass vials with rubber stoppers were adjusted for use. The medicaments were prepared and injected into the root canals using sterile plastic syringes. An apparatus was used to evaluate for 30 days leakage. The chamber was filled with 3 ml of human saliva and Brain Heart Infusion (BHI) broth, incubated at 37°C and checked daily for the appearance of turbidity in the BHI broth. Results: Recontamination was detected after an average time of 2.6 days in group 2, 15.9 days in group 3, 30 days in group 1, 27.6 days in group 4, 2.9 days in group 5, 1 day in the positive control, and there was no contamination in the negative control group. Conclusion : The NaOCl group showed the highest worst average of recontamination; on the other hand, high averages were also shown by Ca(OH) 2 + CPMC and Ca(OH) 2 + 2% CHX in gel.

O advento do tratamento psiquiátrico moderno: a terapia convulsiva de László Meduna / Lessons from an early account of convulsive therapy

A terapia convulsiva (TC) constitui uma das principais contribuições européias ao tratamento psiquiátrico moderno e à psiquiatria biológica. A TC foi introduzida na psiquiatria em 1934 por László Meduna, neuropsiquiatra húngaro. As publicações subseqüentes sobre o primeiro paciente tratado com TC, Zoltán L (ZL), baseiam-se nos artigos e na autobiografia de Meduna. De acordo com essas referências, após quatro anos de estupor catatônico, ZL recebeu TC induzida por cânfora que resultou em plena remissão dos sintomas esquizofrênicos, culminando com alta da instituição. Este artigo reconstrói a história do caso de ZL a partir da recente recuperação de anotações - algumas escritas pelo próprio Meduna - dos Arquivos do Instituto Nacional de Psiquiatria e Neurologia (Hungria). Essas anotações mostram que ZL recebeu repetidas sessões de TC entre 1934 e 1937, primeiramente induzidas por cânfora e depois por cardiazol. A primeira série de TC resultou na suspensão do estupor catatônico e na remissão parcial da psicose. Entretanto, a remissão foi breve e, a despeito de repetidas sessões de TC, ZL nunca esteve inteiramente livre de sintomas, nunca teve alta hospitalar e veio a falecer no Instituto em 1945. Na discussão do caso de ZL, tentamos explicar as possíveis razões das discrepâncias entre o relato de Meduna e as notas originais do prontuário médico.

Convulsive therapy (COT) is a major European contribution to the psychiatric armamentarium and biological psychiatry. COT was introduced in psychiatry by László Meduna, a Hungarian neuropsychiatrist. All subsequent publications about the first patient treated with COT, Zoltán L (ZL), were based on Meduna's papers and autobiography. After 4 years of catatonic stupor, ZL received camphor-induced COT which resulted in full remission and discharge from the institution. The aim of this paper is to reconstruct ZL's case history from the original case notes-partly written by Meduna himself-which were recovered from the archives of the National Institute of Psychiatry and Neurology. The case notes show that ZL repeatedly received COT between 1934 and 1937, first with camphor and then with cardiazol induction. After the first course of COT the catatonic stupor was resolved and the psychotic symptoms subsided. However, the remission lasted for only a few months and was followed by a relapse. Despite repeated courses of COT, ZL never became symptom free again, was never discharged and died in the Institute in 1945. This historical case is discussed from both the diagnostic and therapeutic points of view, and an attempt is made to explain the possible reasons for the discrepancies found between Meduna's account and ZL's case notes.

Periradicular repair after two-visit endodontic treatment using two different intracanal medications compared to single-visit endodontic treatment

The number of appointments necessary to treat infected root canals is one of the most controversial issues in endodontics. This study evaluated, in dogs, the response of the periradicular tissues to the endodontic treatment of infected root canals performed in a single visit or in two visits, using different interappointment dressings. Periradicular lesions were induced by inoculating Enterococcus faecalis in the root canals. After confirming that a periradicular lesion developed, the root canals were treated within one or two visits, using either ozonized oil or calcium hydroxide in camphorated paramonochlorophenol (CMCP) as an intracanal medication. After 6 months, the animals were sacrificed and the specimens were processed for histological and histobacteriological analysis. The root canals treated in a single visit showed a success rate of 46 percent. When a calcium hydroxide/CMCP-based interappointment intracanal medication was used, 74 percent of the cases were categorized as success. In cases where ozonized oil was used as the intracanal medication, a success rate of 77 percent was observed. These results of the present study demonstrated that the two-visit treatment offered a higher success rate compared to one-visit therapy. In addition, ozonized oil may potentially be used as an intracanal medication.

O número de sessões necessárias para tratar um canal radicular infectado é um dos assuntos mais controversos da endodontia. O objetivo deste estudo foi analisar, em cães, a resposta dos tecidos perirradiculares ao tratamento endodôntico de canais infectados em uma ou duas consultas, usando diferentes medicamentos entre as sessões. Lesões perirradiculares foram induzidas pela inoculação de Enterococcus faecalis nos canais. Após a confirmação do desenvolvimento de uma lesão perirradicular, os canais foram tratados em uma ou duas sessões, usando óleo ozonizado ou hidróxido de cálcio associado ao paramonoclorofenol canforado (PMCC) como medicação intracanal. Após 6 meses, os animais foram sacrificados e os espécimes processados para análise histológica e histobacteriológica. Os canais tratados em sessão única apresentaram uma taxa de sucesso de 46 por cento dos casos. Quando a medicação usada entre as sessões foi o hidróxido de cálcio associado com o PMCC, 74 por cento dos casos resultaram em sucesso. Nos casos em que o óleo ozonizado foi usado, uma taxa de sucesso de 77 por cento foi observada. Esses achados demonstraram que o tratamento em duas sessões oferece uma taxa de sucesso mais alta quando comparado à terapia em uma sessão. Além disso, o óleo ozonizado mostrou potencial para ser usado como medicação intracanal.

Clinical and radiological evaluation of zinc oxide-eugenol and Maisto's paste as obturating materials in infected primary teeth--nine months study.

The present study, performed in-vivo, included 30 infected primary teeth in 26 children in the age group of 3-8 years. The purpose of this study was to compare the efficacy of two obturating materials, zinc oxide-eugenol and Maisto's paste, in infected primary teeth. 30 teeth were divided into two groups of 15 teeth. Teeth in Group I were obturated using zinc oxide-eugenol and those in Group II were obturated using Maisto's paste. On clinical evaluation, teeth obturated with Maisto's paste showed 100% success. Five teeth that were overfilled with Maisto's paste showed complete resorption of excess material within 3 months while the two teeth overfilled with zinc oxide-eugenol showed incomplete resorption of the excess material even after 9 months. Zinc oxide-eugenol treated cases showed only 26.7% bone regeneration while in case of Maisto's paste, it was 93%. Complete healing of the inter-radicular pathology was seen with Maisto's paste. However, the pathology was present in 40% of the zinc oxide-eugenol treated teeth even after 9 months. Maisto's paste was thus seen to be superior to zinc oxide-eugenol both in clinical as well as radiological evaluation, done over a period of 9 months in relation to bone regeneration, healing of inter-radicular pathology and resorption of excess material.