Removable partial denture models and comunication among dentists and laboratory technicians in the city of de Teresina, Piauí, Brazil

Objective: To evaluate the quality of models for making removable partial dentures. Methods: In this Study, 140 models were analysed in 05 dental prosthesis laboratories in the city of Teresina, Piauí, Brazil, registered with the Conselho Regional de Odontologia. A form containing 14 closed questions was applied, and the data collected were submitted to statistical analysis using the SPSS program. The models were analysed under natural or artificial light and photographed for record and illustration purposes. Results: The results showed that in 100% of the cases the molding material used was alginate, and 93.43% of the models were poured by the dentist. Of these, 64.47% were poured in stone plaster and 36.43% in special plaster. According to criteria such as surface quality, reproduction of details, presence of bubbles and/or nodules, adequate reproduction of the edentulous area, 78.57% of the models were considered inadequate. The majority of the models (96.43%), were mounted in an articulator by the Dental Laboratory Technician, but only 1 dentist sent the record for mounting the models. The hinge type articulator was used in 97.14% of the mountings. In 94.29% of the cases, the planning and design were not executed by the dentist and in 87.86% of the cases no evidence of mouth preparation was found. In 80% of the cases, communication between the dentist and the Dental Laboratory Technician was done by telephone. Conclusion: Thus it was verified that the removable partial denture continues to be neglected as regards its clinical and laboratorial fabrication, through an excessive transfer of responsibilities from the dentist to the Dental Laboratory Technician and an inefficient communication between the two

Conducts of disinfection, pouring and storage of irreversible hydrocolloid impressions by undergraduate students

Abstract Introduction Obtaining dental models that accurately represent the molded oral tissue requires professional attention, especially when using irreversible hydrocolloid as a molding material. Objective To evaluate the conducts of undergraduate dental students at different internships for the disinfecting procedures, pouring, and storage of irreversible hydrocolloid impressions. Material and method This is an observational, cross-sectional and descriptive study with a census sample of 89 students enrolled in the supervised internships I, II, III and IV. Data collection was performed using a structured questionnaire containing eight questions. Data were analyzed at the 5% significance level. Result Most of the students (88.8%) performed the disinfection procedure, for which the most widely used method (64.6%) was the application of sodium hypochlorite 1% spray stored in a sealed container. The most common disinfection time was 10 minutes (86.1%). Students in the early internships performed better in regard to the proportion of water/plaster to be used compared with students in the final internships. At all internships, pouring and storage of the ensemble of mold and model were neglected during the setting reaction. There was a statistically significant association between the stage and the disinfection method, the ratio of water/powder and pouring of the model (p<0.05). Conclusion Students exhibited appropriate conduct of disinfection; however, they should be encouraged to use evidence-based clinical practices in order to improve the procedures of pouring and storage of irreversible hydrocolloid molds

Influence of a new method of sterilization on the morphology and physical properties of extracted human teeth

<div><p>Abstract Introduction Sterilization methods adopted in Human Teeth Bank can promote structural changes in enamel and dentin. Thus, the ideal method should combine the antimicrobial efficacy and preservation of the substrate biomechanical properties. Aim Evaluated the morphology and physical properties of enamel and dentin of extracted human teeth, after being submitted to different sterilization methods. Method Sixteen extracted third molars were sectioned in the following tooth regions: mesio-distal, vestibular-lingual and at the cement enamel junction. Forty specimens were selected according to values of microhardness and roughness initials, and distributed in four experimental groups (n = 10/group): Group 1 = Autoclave 121 °C (30 minutes); Group 2 = 2.5% Sodium hypochlorite (07 days); Group 3 = 5.25% Sodium hypochlorite (07 days); Group 4= 30% Acetic Acid (7 days). After sterilization, the microhardness, roughness and morphology of enamel and dentin were evaluated. Data were analyzed by paired t-test, Wilcoxon, Kruskal-Wallis and Analysis of Variance. A significance level of 5% was adopted. Result All sterilization methods altered the microhardness and roughness of the dentine (p <0.05). Regarding to enamel, the microhardness was affected only by Autoclave and 2.5% Sodium hypochlorite treatment (p <0.05). A large aperture of the enamel pores and dentinal tubules was verified in the micrographs. Conclusion The sterilization methods adopted altered the morphology and/or physical properties of enamel and dentine.</p></div

Influence of a new method of sterilization on the morphology and physical properties of extracted human teeth

<div><p>Abstract Introduction Sterilization methods adopted in Human Teeth Bank can promote structural changes in enamel and dentin. Thus, the ideal method should combine the antimicrobial efficacy and preservation of the substrate biomechanical properties. Aim Evaluated the morphology and physical properties of enamel and dentin of extracted human teeth, after being submitted to different sterilization methods. Method Sixteen extracted third molars were sectioned in the following tooth regions: mesio-distal, vestibular-lingual and at the cement enamel junction. Forty specimens were selected according to values of microhardness and roughness initials, and distributed in four experimental groups (n = 10/group): Group 1 = Autoclave 121 °C (30 minutes); Group 2 = 2.5% Sodium hypochlorite (07 days); Group 3 = 5.25% Sodium hypochlorite (07 days); Group 4= 30% Acetic Acid (7 days). After sterilization, the microhardness, roughness and morphology of enamel and dentin were evaluated. Data were analyzed by paired t-test, Wilcoxon, Kruskal-Wallis and Analysis of Variance. A significance level of 5% was adopted. Result All sterilization methods altered the microhardness and roughness of the dentine (p <0.05). Regarding to enamel, the microhardness was affected only by Autoclave and 2.5% Sodium hypochlorite treatment (p <0.05). A large aperture of the enamel pores and dentinal tubules was verified in the micrographs. Conclusion The sterilization methods adopted altered the morphology and/or physical properties of enamel and dentine.</p></div

Prevalência de dentes supranumerários em pacientes atendidos no Hospital Universitário da UFPI: um estudo retrospectivo de cinco anos

INTRODUÇÃO: Variações no desenvolvimento dentário podem implicar em alterações no número de dentes, como, por exemplo, a hiperdontia, que é caracterizada pela formação de dentes em excesso, que são chamados de supranumerários. Sua ocorrência está frequentemente associada a patologias e interferências na erupção dos dentes permanentes, que podem comprometer a estética e a oclusão. Portanto, é importante descrever seu perfil epidemiológico. OBJETIVO:Este estudo objetivou analisar dados epidemiológicos, em prontuários, avaliando a prevalência dos dentes supranumerários. MATERIAL E MÉTODO: A amostra constituiu-se de 1511 prontuários de pacientes atendidos no Hospital Universitário da Universidade Federal do Piauí, entre janeiro de 2006 e janeiro de 2011, observando-se a prevalência dos dentes supranumerários segundo número de pacientes, gênero, faixa etária, cor da pele, localização, posição no arco dentário, tipo e tratamento. RESULTADO: A prevalência dos dentes supranumerários foi de 1,99%, ocorrendo em pacientes de cor parda (78,57%), com dentição permanente (86,96%), do gênero masculino (53,33%), localizados em região posterior de maxila (35%) e mandíbula (35%), e do tipo paramolar (38,10%). A maioria das cirurgias foi realizada por indicação ortodôntica (62,96% dos casos). CONCLUSÃO: De acordo com os resultados, a presença de dentes supranumerários foi um achado incomum com predominância pela maxila, sendo o tipo paramolar o mais frequente. Todos os casos foram tratados por remoção cirúrgica, sendo a maioria por indicação ortodôntica

Membranas para regeneração óssea guiada em odontologia: uma revisão de humanos randomizados ensaios clínicos cegos

Objective: to review the literature currently available on membranes for guided bone regeneration in clinical dental practice. Material and Methods: a literature search was performed on PubMed, Web of Science and Scopus. The Jadad Scale was used for data collection and selection. The quality of the studies was evaluated through Cochrane Center Guidelines. Randomized and blinded clinical trials published in Portuguese, Spanish and English were included. Literature reviews of studies without randomization and blinding or when a percentage equal to or greater than 20% of the sample did not proceed with the study follow-up were excluded. We selected 27 studies that were categorized according to the findings. Results: the number of publications found limited the conclusions on the success of GBR in dentistry. Conclusion: the variety of techniques and membranes applied, as well as the small number of studies found are in need of well-designed studies in order to better evaluate the potential of GBR in patients submitted to these treatment approaches, as well as to determine accurate treatment protocols.Objetivo: revisar a literatura atualmente disponível sobre membranas para a regeneração óssea guiada na prática odontológica clínica. Material e Métodos: uma pesquisa da literatura foi realizada no PubMed, Web of Science e Scopus. A Escala de Jadad foi usada para coleta e seleção de dados. A qualidade dos estudos foi avaliada através das Diretrizes do Centro Cochrane. Ensaios clínicos randomizados e cegos publicados em português, espanhol e inglês foram incluídos. Revisões bibliográficas de estudos sem randomização e mascaramento ou quando uma percentagem igual ou superior a 20% da amostra não prosseguiu com o seguimento do estudo foram excluídos. Nós selecionamos 27 estudos que foram categorizados de acordo com os achados. Resultados: o número de publicações encontradas limitou as conclusões sobre o sucesso da GBR na odontologia. Conclusão: a variedade de técnicas e membranas aplicadas, bem como o pequeno número de estudos encontrados, carecem de estudos bem desenhados para melhor avaliar o potencial de GBR em pacientes submetidos a estas abordagens de tratamento, bem como para determinar protocolos de tratamento precisos

Análise da eficácia antimicrobiana do ácido peracético na desinfecção de moldes de hidrocoloide irreversível

Resumo Introdução Nos últimos anos, o ácido peracético tem sido utilizado na Odontologia para desinfecção de moldes de hidrocoloide irreversível. Objetivo Avaliar a eficácia antimicrobiana do ácido peracético nas técnicas de nebulização e pulverização, em moldes de hidrocoloide irreversível. Material e método Oitenta moldes de hemiarcos de voluntários foram distribuídos aleatoriamente em quatro grupos experimentais (n=20), com respectivos controles. Os moldes foram submetidos à desinfecção por dez minutos com ácido peracético 0,2% e hipoclorito de sódio 1%, pelos métodos de nebulização, com atmosfera de 100% de umidade relativa, e pulverização. Após desinfecção, cada molde foi imerso em solução salina e submetido à vibração ultrassônica para dispersão de possíveis microrganismos. Para análise microbiológica desta solução, foi realizada contagem de colônias que cresceram em meio de cultura estéril BHI-ágar após 24 h em estufa incubadora a 37°C. Resultado Em todos os grupos, foi significante a diferença no número médio de colônias decorrentes da análise estatística do controle e do grupo experimental correspondente (p<0,05). Comparando-se o ácido peracético (0,2%) nos dois métodos, não houve diferença significativa (p=0,420); no entanto, comparando-se o hipoclorito de sódio (1%) nos dois métodos, a diferença foi estatisticamente significante (p=0,010). No mesmo método e com soluções diferentes, a nebulização com ácido peracético 0,2% foi mais eficaz que o hipoclorito de sódio 1% (p=0,030). Conclusão Ácido peracético 0,2% pode ser usado para desinfecção de moldes de hidrocoloide irreversível nos métodos de pulverização e nebulização. Hipoclorito de sódio 1% mostrou ser mais eficaz quando se usou o método de pulverização