Iodoform Vs Calcium Hydroxide/Zinc Oxide based pastes: 12-month findings of a Randomized Controlled Trial

Abstract This study evaluated clinical and radiographic twelve-month outcomes of root canal treatments (CT) with smear layer removal, performed in primary teeth, using two different root canal filling materials. Pulpectomy was performed on 27 primary teeth with necrosis or irreversible pulpitis, caused by dental caries or trauma, in 23 children (2-7 years old). A single trained operator performed the CT in a single visit in cases without periapical or interradicular radiolucency (PIR) or in multiple visits in cases with PIR. Participants were selected based on specific inclusion and exclusion criteria, and randomly allocated into two groups: Group 1 (G1) - iodoform paste (iodoform + camphorated parachlorophenol + ointment comprising prednisolone acetate 5.0 mg and rifamycin 1.5 mg); Group 2 (G2) - Calen®/ZO paste. Treated teeth were restored with composite resin immediately after the root canal filling. The outcomes were evaluated clinically and radiographically according to specific criteria. Two blinded and standardized evaluators assessed the radiographic outcomes. We used descriptive analyses due to the small sample size. CTs were performed due to caries lesions in 70.4% of the cases and due to trauma in 29.6%. Only one tooth of G1 was unsuccessful; hence, pulpectomy performance in both groups was not influenced by the filling material, nor by any other analyzed variable. The level of the root canal filling was better in the Calen®/ZO group. The clinical and radiographic twelve-month outcomes indicated successful treatment, independently of the root filling material used.

Efeito da pomada de óxido de zinco e da película de barreira não irritante na prevenção da dermatite associada à incontinência em idosos hospitalizados: ensaio clínico randomizado / Effect of zinc oxide ointment and non-irritant barrier film on the prevention of incontinence-associated dermatitis in hospitalized elderly: a randomized clinical trial

Observa-se na prática clínica pacientes internados com Dermatite Associada à Incontinência (DAI), uma inflamação cutânea que ocorre como consequência do contato entre a pele perineal, perigenital, perianal e áreas adjacentes com urina e fezes, além de epiderme com erosão e maceração. O cuidado com a prevenção deve ser estabelecido, mas pouco se sabe sobre esse cuidado. É necessário evitar ou minimizar a exposição a fatores causais e uma combinação de cuidados específicos da pele, como a limpeza da região, aplicação de produtos barreira. Normalmente, são utilizados sabão e água e é aplicado a pomada de óxido de zinco, um creme de barreira. No entanto, desde a década de 1990, uma película de barreira não irritante (PBNI), livre de álcool foi projetado para proteger a pele. O objetivo deste estudo foi comparar o efeito do uso de pomada de óxido de zinco e PBNI na prevenção de DAI em pacientes incontinentes internados em unidades de clínica médica. É um estudo experimental, do tipo ensaio clínico randomizado realizado em um hospital geral, de grande porte, público e de ensino. A população do estudo foi constituída por 114 pacientes idosos, que apresentavam eliminações urinárias e fecais em fralda descartável. Foram definidos três grupos de estudo, com 38 paciente em cada grupo: controle com o uso da higienização com água e sabão, intervenção I com a higienização e aplicação da pomada de óxido de zinco e intervenção II com higienização e aplicação do PBNI spray. Para a análise descritiva, foram utilizadas as distribuições de frequência simples, medidas de tendência central e medidas de variabilidade; para a avaliação do efeito das intervenções, o teste de regressão de Cox. Quanto ao efeito dos tratamentos sobre o risco de adquirir a DAI, identificou-se que os pacientes que receberam a intervenção II apresentaram menor risco (HR=0,54; p= 0,183) quando comparado ao grupo que recebeu intervenção I (HR=1,06; p=0,895) e ao grupo que recebeu somente a higienização. Contudo, não se encontrou diferença estatisticamente significativa entre os dois grupos de intervenção e o controle, não sendo possível afirmar qual a melhor intervenção. As variáveis que tiveram influência no aparecimento da DAI foram: dias de uso de tamanho adequado da fralda, número de dias de fezes pastosas, pacientes em risco nutricional e nível de saturação de oxigênio, sendo, portanto, fatores que devem ser monitorados pela enfermagem para evitar o surgimento do problema.(AU)

It is observed in clinical practice patients hospitalized with Incontinence-Associated Dermatitis (IAD), a cutaneous inflammation that occurs as a consequence of the contact between the perineal, perigenital, perianal skin and adjacent areas with urine and feces, as well as epidermis with erosion and maceration. Care with prevention should be established, but little is known about such care. It is necessary to avoid or minimize exposure to causative factors and a combination of specific skin care, such as cleaning the region, applying barrier products. Usually, soap and water are used and it is applied to zinc oxide ointment, a barrier cream. However, since the 1990s, a non-irritating barrier film (NIBF), alcohol-free was designed to protect the skin. The objective of this study was to compare the effect of the use of zinc oxide ointment and NIBF in the prevention of IAD in incontinent patients hospitalized in medical clinic units. It is an experimental study, of the type randomized clinical trial conducted in a general hospital, large, public and teaching. The study population consisted of 114 elderly patients, who had urinary and fecal eliminations in a disposable diaper. Three study groups were defined, with 38 patients in each group: control with the use of soap and water hygiene, intervention I with the hygiene and application of the zinc oxide ointment and intervention II with hygiene and application of NIBF spray. For the descriptive analysis, we used the simple frequency distributions, measures of central tendency and measures of variability; for the evaluation of the effect of the interventions, the Cox regression test. Regarding the effect of the treatments on the risk of acquiring the IAD, it was identified that the patients who received the intervention II had a lower risk (HR = 0.54; p = 0,183) when compared to the group that received intervention I (HR = 1.06, p = 0.895) and the group that received only the hygiene. However, no statistically significant difference was found between the two intervention groups and the control, and it was not possible to state the best intervention. The variables that influenced the appearance of IAD were: days of adequate diaper size, number of days of pasty stools, patients at nutritional risk and oxygen saturation level, and therefore, factors that should be monitored by nursing to prevent the problem from arising.

Intracanal dressing paste composed by calcium hydroxide, chlorhexidine and zinc oxide for the treatment of immature and mature traumatized teeth

AIM : To evaluate clinical and radiographic aspects before and after endodontic treatment with an intracanal dressing paste composed of calcium hydroxide, chlorhexidine and zinc oxide in traumatized teeth followed-up for 1 year. METHODS : Patients (n=105) treated at the Dental Trauma Service of Piracicaba School of Dentistry, Brazil were enrolled in the study. Two groups of teeth were formed: immature (G1) (n=28) and completely developed teeth (G2) (n=174). All teeth were endodontically treated and received an intracanal dressing with a paste composed by calcium hydroxide, 2% chlorhexidine gel and zinc oxide at a 2:1:2 rate. Clinical and radiographic aspects were evaluated initially, monthly and after 1-year. RESULTS : Most of the immature teeth suffered extrusive luxation (39.3%), whereas intrusive luxation (40.8%) was more common in completely developed teeth. There was a significant reduction in pain on percussion and mobility (p=0.0001) for immature teeth. Mature teeth showed reduction of spontaneous pain, fistula, mobility and pain on percussion (p<0.0001). Radiographic examination showed decrease in all evaluated parameters for both groups, in addition to stabilization of root resorption. CONCLUSIONS : This new intracanal dressing paste for traumatized teeth showed promising results in both immature and completely developed teeth, and may prevent post-traumatic complications.

Anti-diabetic activity and safety assessment of Ayurvedic medicine, Jasada bhasma (zinc ash) in rats.

Jasada bhasma (zinc ash) is an extensively used Ayurvedic medicine for treating diabetes mellitus. The present communication presents yet unavailable comprehensive scientific data on its physico-chemical nature vis-à-vis anti-diabetic activity and toxicity profile.Zinc ash prepared by traditional method was found to consist of 200-500 nm sized particles, predominantly zinc oxide with hexagonal wurtzite crystal structure.The effective dose range of zinc ash in oral glucose tolerance tests performed using normoglycemic Wistar rats was found to be 3-30 mg/kg. Subsequently anti-diabetic activity was assessed in streptozotocin induced type 1 and type 2 diabetic rats. Four weeks treatment with zinc ash (1, 3, 10 mg/kg) resulted in improved glucose tolerance (16-19%), lowered blood glucose levels (20-33%) and reduced serum insulin levels (27-32%). Systemic absorption was assessed by single dose pharmacokinetic study where serum zinc levels were found to be elevated (3.5 folds) after oral administration of zinc ash. Acute and sub-acute toxicity tests demonstrated safety of zinc ash up to 300 mg/kg doseie. 100 times the efficacy dose in rats.These findings, the first of their kind, provide concrete scientific evidence that justifies usage of zinc ash in diabetes treatment.

Resposta da polpa dental humana protegida com óxido de zinco em apicogênese / Response of human dental pulp protected with zinc oxide in apexogenesis

O presente estudo teve por objetivo verificar a manutenção da vitalidade do remanescente pulpar, após curativo com óxido de zinco, com a finalidade de completar a gênese radicular sem a formação da barreira dentinária. Dos 11 dentes com rizogênese incompleta, selecionados em dez pacientes, nenhum formou barreira dentinária com o uso do óxido de zinco como recobrimento do tecido pulpar remanescente, empregando a técnica da pulpotomia como terapia pulpar conservadora. O tecido pulpar remanescente permaneceu com vitalidade e ocorreu desenvolvimento fisiológico e fechamento completo do final da raiz.

Comparison of 2% chlorhexidine and 5.25% sodium hypochlorite irrigating solutions on postoperative pain: A randomized clinical trial.

Aim: To compare the levels of postoperative pain after cleaning and shaping of root canals using two different root canal irrigants for debridement. Materials and Methods: Forty patients with irreversible pulpitis, pulp necrosis and non-vital teeth exhibiting acute apical periodontitis requiring root canal treatment were included. At random, canals were cleaned and shaped with the following protocols. 2% chlorhexidine solution in group I and 5.25% sodium hypochlorite solution in group II were used as an irrigants. Access cavities were closed with a sterile cotton pellet and cavit. The patients recorded degree of pain at various time intervals after cleaning and shaping on a visual analogue scale for 1 week. Results: The mean pain score for group I was between 0.65 and 3.35 and for group II was between 0.95 and 4.50. There was significant difference in the pain level between the two groups only at 6 th hour postoperatively (P<0.05) and the pain was more in sodium hypochlorite group. Conclusions: More pain was present in teeth irrigated using 5.25% sodium hypochlorite when compared to that in teeth irrigated using 2% chlorhexidine solution. Significant difference in pain level was present only at 6th hour postoperatively, and at all other periods (24 th hour, 4 th and 7 th days) there was no significant difference in pain level between the two groups.

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.

Effect of immediate and delayed post space preparation on the apical seal of root canals obturated with different sealers and techniques

During mechanical preparation of the post space, the root canal filling may be twisted or vibrated, depending on several factors associated with the preparation technique and quality of filling. OBJECTIVE: The purpose of this study was to investigate the effect of immediate and delayed post space preparation on the integrity of the apical seal. MATERIAL AND METHODS: Sixty-four extracted human incisors were biomechanically prepared using the step-back technique. Sixty roots were randomly assigned to 6 experimental groups of 10 teeth each and the remaining 4 roots served as positive and negative controls (n=2). The root canals in the different groups were obturated with cold lateral and warm vertical condensation of gutta-percha and one of two sealers (Sealapex and Diaket). Post space was prepared either individually or simultaneously. An insulated copper wire was cut into 10-cm-long pieces. In each canal, one piece was inserted to maintain contact with gutta-percha and extended to the outside as one of two working electrodes. A stainless steel wire with the same dimensions of those of the copper wire, used as the other working electrode, was immersed into the background electrolyte from the center of the bottle. The electrical current between standard and experimental electrodes in canals was measured over a period of 10 days applying a conductivity meter. The Kruskal-Wallis test (p=0.05) determined whether there was a significant difference in microleakage among the groups and the Mann-Whitney U test (p=0.01) was used for multiple comparison grouping variables. RESULTS: The results suggest that only the differences between the root canal filling techniques were statistically significant (p<0.01). There were no statistically significant difference in the sealers and the times of filling removal for post space preparation (p>0.01). CONCLUSION: The quality of the root canal filling is important for the integrity of the apical seal.

Periapical tissue healing after post space preparation with or without use of a protection plug and root canal exposure to the oral environment: study in dogs

The purpose of this study was to evaluate the influence of coronal leakage on the healing of dogs' periapical tissues after root canal filling, post space preparation and protection or not with a temporary sealer plug. Forty root canals of dogs' teeth were instrumented and filled by the lateral condensation technique with gutta-percha points and Endomethasone or CRCS sealers. After post space preparation, the remaining filling material was protected or not with a plug of temporary Coltosol sealer and exposed to the oral environment for 90 days. Thereafter, the animals were sacrificed and the specimens were removed and prepared for histomorphological and histobacteriological analysis. The findings revealed 35 percent of microbial leakage in the groups without plugs and 15 percent of leakage in the groups with plugs. Statistical analysis showed that the use of a Coltosol plug improved significantly the histomorphological results regardless of the type of root canal sealer (p=0.05) and that CRCS and Endomethasone sealers showed similar results (p>0.05).

O propósito deste trabalho foi avaliar a influência da infiltração coronária no reparo dos tecidos periapicais após obturação dos canais radiculares, preparo para pino e proteção ou não de um "plug" de cimento temporário. Quarenta canais de dentes de cães foram instrumentados e obturados pela técnica da condensação lateral ativa com cones de guta-percha e os cimentos Endomethasone e CRCS. Após preparo para pino os remanescentes do material obturador foram protegidos ou não com um "plug" do cimento temporário Coltosol e expostos ao meio oral por 90 dias. Decorrido este período, os animais foram mortos e os espécimes foram removidos e preparados para análises histomorfológica e histobacteriológica. Foi observado 35 por cento de casos de infiltração bacteriana nos grupos sem "plug" e 15 por cento nos grupos com "plug". Concluiu-se estatisticamente que o "plug" de Coltosol foi eficiente no controle da infiltração coronária de microorganismos (p=0,05), e que os cimentos CRCS e Endomethasone apresentaram resultados semelhantes (p>0,05).

Comparison of dexpanthenol and zinc oxide ointment with ointment base in the treatment of irritant diaper dermatitis from diarrhea: a multicenter study.

BACKGROUND: Severity of irritant diaper dermatitis (IDD) from diarrhea varies from patient to patient depending on the nature of feces and the number of bowel movements. The purpose of the present study was to compare the effectiveness of dexpanthenol and zinc oxide ointment with ointment base in the treatment of irritant diaper dermatitis from acute diarrhea in children by measuring transepidermal water loss (TEWL). MATERIAL AND METHOD: Forty-six children with diarrhea were prospectively, block randomized, investigator-blinded to receive dexpanthenol and zinc oxide ointment on one side and ointment base on the other side. TEWL was measured before and on days 1, 3, and 7 of treatment together with the assessment of severity score. The efficacy of treatment was defined by complete clearance of the lesion. RESULTS: TEWL in the treated and control side was not different before the application of the topical medication. In the present study, the efficacy of 5% dexpanthenol and zinc oxide ointment on D3 was 39% (18from 46 patients) compared to 32% in the ointment base side. On D7, the efficacy of the treated side was 58.7% and the ointment base side was 56%. The patients who still had skin lesions were those who had prolonged diarrhea. On the treated side, the mean of TEWL was lower than the control side on DI (p = 0.18) and had significant improvement on D3 (p = 0. 002). At the end of the present study, TEWL on the treated side was less than TEWL of the control side but it did not have statistical significance (p = 0.07). There was no rash or sign of abnormality on the treated side at the end of D7. CONCLUSION: In the treatment of lDD from acute diarrhea, 5% dexpanthenol and zinc oxide ointment significantly decreased TEWL in the treated side more than the ointment base on day 3 but the severity score was not significantly different on days 1, 3 and 7.

Uso do hidróxido de cálcio nos canais radiculares / Root canal treatment with calcium hydroxide

Dentes humanos extraídos foram preparados biomecanicamente, submetidos à remoção do cemento e tratados por 5 minutos com EDTA para remoção da "smear layer". Os canais foram preenchidos com uma pasta de hidróxido de cálcio e as aberturas coronárias e os forâmes apicais selados. Os dentes foram então mergulhados em água destilada e o pH ambiente avaliou diariamente. Notou-se um aumento gradativo do pH, chegando a 8,60 aos 30 dias, quando aquele fármaco foi removido e os canais obturados com óxido de zinco e eugenol ou Sealapex. Colocado os dentes em nova água destilada, o pH foi novamente avaliado até 30 dias. Foi observado um pH 8,40 com o Sealapex e 7,26 com o óxido de zinco e eugenol. Concluiu-se que o aumento do pH da dentina é lento e progressivo e que, dentre os dois cimentos estudados, apenas o Sealapex manteve o pH alcançado pela pasta de hidróxido de cálcio.

Fotoprotección tópica: agentes activos particulados / Topical photoprotection: particulated active agents

Se realiza una revisión sobre los agentes fotoprotectores tópicos denominados "físicos" de uso actual: dióxido de titanio y óxido de zinc. Se analizan sus características, mecanismo de acción, potencia, efectividad y posibles efectos indeseables. Con la descripción de las características del comportamiento de las partículas en relación con la luz, proponemos una reclasificación de los fotoprotectores tópicos basadas en los conocimientos actuales sobre su mecanismo de acción

Tratamento conservador da polpa dental: aspectos atuais / Conservative dental pulp treatment: actual view

A busca da manutençäo da vitalidade e integridade pulpar tem sido um fato corriqueiro na odontologia moderna. Tentativas de proteçäo pulpar direta ocorrem desde o século XVIII. Vários materiais têm sido propostos com esta finalidade, apresentando qualidades favoráveis e desfavoráveis que devem ser consideradas. Em 1920, Hermann introduziu o hidróxido de cálcio, que se tornou um marco histológico para a preservaçäo pulpar. A partir desta época, várias outras substâncias e associaçöes foram propostas, desde o cimento de óxido de zinco e eugenol até materiais mais recentes, como o agregado de trióxido mineral

Estudo histológico do tecido conjuntivo pulpar de ratos noverginus, frente à exposiçäo acidental experimental, com e sem isolamento absoluto, seguida de capeamento direto com óxido de zinco e eugenol modificado - IRM / Histologic study of pulpar tissue molar rat exposition, followed by zinc oxide eugenol modified - IRM capping, with without use of Rubber Dam

Neste trabalho, estudamos, histologicamente, a interferência ou näo do uso de dique de borracha como método de isolamento absoluto em casos de exposiçäo acidental experimental do tecido pulpar de dentes molares de ratos, seguida de capeamento direto com Oxido de Zinco e Eugenol Modificado - IRM, verificando as reaçöes que pudessem ocorrer no tecido conjuntivo pulpar em diferentes tempos: aos 07, 14, 21 e 28 dias. O experimento propriamente dito nos possibilitou observar, em ratos, uma reparaçäo dental mais rápida nos casos onde o dique de borracha era empregado, nos levando a crer que o contato do tecido pulpar com a saliva e agentes da cavidade bucal do animal interferem na qualidade e intensidade da resposta obtida frente ao capeamento pulpar direto, näo dependendo essa propriedade do material utilizado para tal finalidade

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.

Pulpotomias em dentes decíduos com o emprego do formocresol diluído a 1/5 e com a pasta Guedes-Pinto modificada: observaçäo clínica e radiográfica / Pulpotomy in deciduous teeth and application of formocresol diluted at 1/5 with Guedes-Pinto modified paste: clinical and radiographic observation

Foram realizadas pulpotomias em 80 dentes decíduos, dos quais, 40 foram tratados pela técnica que utiliza o formocresol diluído a 1/5 e 40, pela técnica que utiliza a pasta preconizada por Guedes-Pinto, modificada pelo acréscimo de óxido de zinco. Após estudo clínico e radiográfico, por 24 meses, os autores concluíram a superioridade da pasta Guedes-Pinto modificada no tratamento dos dentes decíduos

Análise histopatológica comparativa em polpa de dentes de cäes, após pulpotomia e utilizaçäo de pastas a base de hidróxido de cálcio em diferentes veículos / Histopathologic comparative analysis in dogs'vital teeth, after pulpotomy with calcium hydroxide pastes in different vehicles

O objetivo desta pesquisa foi avaliar comparativamente, mediante exame histopatológico, a reaçäo do tecido pulpar de dentes permanentes jovens de cäes, após pulpotomia e utilizaçäo de diferentes pastas a base de hidróxido de cálcio: grupo I - hidróxido de cálcio (0,5g) + polietileno glicol 400 (0,3ml); grupo II - hidróxido de cálcio (0,5g) + óxido de zinco (0,25g) + polietileno glicol 400 (0,3ml); grupo III - hidróxido de cálcio (0,5g) + carboximetilcelulose 1,66 por cento (0,5ml); grupo IV - hidróxido de cálcio (0,5g) + óxido de zinco (0,25g) + carboximetilcelulose 1,66 por cento (0,5ml). Com base nos resultados obtidos, pudemos concluir que: 1) as pastas avaliadas apresentaram boa tolerância tecidual, possibilitando evoluçäo reparativa, nos períodos de análise de 45, 90 e 150 dias; 2) em todos os grupos ocorreu formaçäo de barreira mineralizada completa, desenvolvendo-se em quantidade e qualidade, desde a condiçäo de massa amorfa, contendo resíduos diversos e grupamentos pulpares, até esboços de canalículos dentinários e tendência à ortodentina, no decorrer dos períodos, com melhores resultados no grupo II, seguido dos grupos I, IV e III

Adesividade do cimento de ionômero de vidro à dentina e ligas odontológicas / Adhesivity of the ionomer cements to dentin and dental alloys

Foi estudada a retentividade do cimento de ionômero de vidro à dentina e ligas metálicas. Corpos de prova de dentina e ligas foram cimentadas entre si e submetidos a ensaios de traçäo. Para a dentina empregou-se um cimento Vitrion C e dois para os metais. Estes tiveram superficies rugosas e lisas. Os ensaios foram feitos após um dia de imersäo e após 25 dias com alternância de ciclagem térmica. Os resultados permitiram concluir que: a retençäo à dentina é baixa, mas näo sofre diminuiçäo com imersäo prolongada; a liga de niquel-cromo é mais retentiva que a do cobre-alumínio; o cimento Ketac-Cem é mais retentivo que o Vidrion C; a superficie rugosa propicia maior retentividade; a superfície lisa com imersäo prolongada e ciclagem térmica quase sempre termina em retençäo nula

Efeito do hidróxido de cálcio como curativo de demora no selamento marginal após a obturaçäo de canal / Effect of calcium hydroxide dressings on marginal leakage after root canal filling

Os autores compararam o selamento marginal obtido com o uso de 3 diferentes formulaçöes de curativos de demora à base de hidróxido de cálcio seguidos de obturaçäo de canal, realizada com cones de guta percha acrescidos de Sealapex ou óxido de zinco e eugenol, e concluíram pela maior eficiência do Sealapex