Desempenho de sistemas endodônticos rotatórios constante e progressivo no preparo do canal radicular

Objective The aim of this study was to compare the performance of two nickel-titanium rotary systems regarding the preparation time, final shape of canal, incidence of aberration, transportation, and fracture of instrument. Methods A total of 40 simulated canals in resin blocks with 30o curves and a length of 17 mm were divided randomly into two groups: preparation with ProTaper and BioRaCe systems up to F5 and BR5 respectively. Pre- and post-operative canal images were taken and superimposed in order to identify aberrations, transportation, and to take measurements of the canal width. In addition, the preparation time and instrument fractures were recorded. The data were analyzed using Student's t test. Results There is no difference (p>.05) comparing the systems regarding preparation time, canal aberration, and instrument fracture rates. The progressive tapered instruments of ProTaper prepared significantly larger canal widths in the apical third (p0,05). Os instrumentos progressivos do ProTaper resultou em canais significativamente mais largos no terço apical (p<0,05). Conclusão Os dois sistemas rotatórios avaliados resultaram em preparo endodôntico seguro, com poucas alterações e fratura de instrumento

Influence in the characteristics of an acrylic resin microwave activated after disinfection of various chemical agents: a longitudinal in vitro study.

O objetivo deste estudo foi avaliar a influência dos agentes de desinfecção Hipoclorito de sódio 1%, solução de Digluconato de clorexidina 2%, Vinagre e Água oxigenada 10 v, em diferentes tempos de imersão, na micro dureza, rugosidade e cor na superfície de uma resina acrílica tipo 5. Foram confeccionados 180 corpos de prova (cp) divididos em 18 grupos com 10 cp cada. A microdureza, rugosidade e cor dos corpos de prova desses grupos foram avaliados após três períodos de imersão (30, 150 e 300 horas).Os resultados obtidos foram submetidos ao teste estatístico Kruskal-Wallis e comparações múltiplas de Dunn com nível de significância de 5%. Para a micro dureza Knoop os grupos que apresentaram diferença estatística significativa foram Clorexidina 30 horas, Hipoclorito 150 horas, Água Oxigenada 300 horas e Vinagre 300 horas. Para a rugosidade os grupos Hipoclorito, Água oxigenada e Vinagre mostraram diferença estatística significativa nos tempos de 30, 150 e 300 horas, enquanto que para o grupo Clorexidina foi em 150 e 300 horas. Para a variação de cor, os grupos que demonstraram um valor de ΔE≥3,3 comparado ao Grupo Seco (controle) foram Água oxigenada, Hipoclorito de sódio e Clorexidina após 30 horas; Água oxigenada, Hipoclorito e Vinagre após 150 horas; Água oxigenada, Hipoclorito e Clorexidina após 300 horas. Considerando as limitações deste estudo, podemos concluir que todas as soluções desinfetantes influenciaram a micro dureza, a rugosidade e a variação de cor na superfície da resina acrílica ativada por micro-ondas. A Clorexidina 2% e o Vinagre 4% foram aquelas que causaram alterações tardiamente (150 horas). As demais soluções causaram alterações desde o primeiro período de avaliação.The aim of this study was to evaluate the micro hardness, roughness and color stability of four disinfecting agents (sodium hypochlorite 1% solution of chlorhexidine digluconate 2%, acetic acid4% and hydrogen peroxide 10v), at different times of immersion. It was made 180 specimens (sp) divided into 18 groups of 10 sp each. The micro hardness, roughness and color of the specimens of these groups were evaluated in three periods of immersion (30, 150 and 300 hours). The obtained results were submitted to Kruskal-Wallis and Dunn’s multiple comparison statics test, with a significant level of 5%. The results of Knoop hardness showed that the groups with statistical differences were Chlorhexidine 30 hours, Hypochlorite150 hours, Hydrogen peroxide and Vinegar 300 hours. For roughness, the groups Hypochlorite, Hydrogen peroxide and Vinegar showed a statistically significant difference in the three times of 30, 150 and 300 hours, while the Chlorhexidine group showed statistically significant differences for the time of 150 hours and 300 hours. For variation of color, the groups showed a clinically unacceptable value (ΔE ≥ 3.3), compared to Dry group (control), were Hydrogen peroxide, Sodium hypochlorite and Chlorhexidine in 30 hours of evaluation; in 150 hours were the groups of Hydrogen peroxide, Hypochlorite and Vinegar and 300 hours were the groups Hydrogen peroxide, Hypochlorite and Chlorhexidine. Among the limitations of this study, we conclude that all the disinfection agents had an influence in the micro hardness, roughness and color variation in the surface of an acrylic resin type 5. Chlorhexidine and Vinegar were the ones that lately showed alterations (150 hours). All the other solutions caused alterations since the first evaluation period

Influence in the characteristics of an acrylic resin microwave activated after disinfection of various chemical agents: a longitudinal in vitro study.

O objetivo deste estudo foi avaliar a influência dos agentes de desinfecção Hipoclorito de sódio 1%, solução de Digluconato de clorexidina 2%, Vinagre e Água oxigenada 10 v, em diferentes tempos de imersão, na micro dureza, rugosidade e cor na superfície de uma resina acrílica tipo 5. Foram confeccionados 180 corpos de prova (cp) divididos em 18 grupos com 10 cp cada. A microdureza, rugosidade e cor dos corpos de prova desses grupos foram avaliados após três períodos de imersão (30, 150 e 300 horas).Os resultados obtidos foram submetidos ao teste estatístico Kruskal-Wallis e comparações múltiplas de Dunn com nível de significância de 5%. Para a micro dureza Knoop os grupos que apresentaram diferença estatística significativa foram Clorexidina 30 horas, Hipoclorito 150 horas, Água Oxigenada 300 horas e Vinagre 300 horas. Para a rugosidade os grupos Hipoclorito, Água oxigenada e Vinagre mostraram diferença estatística significativa nos tempos de 30, 150 e 300 horas, enquanto que para o grupo Clorexidina foi em 150 e 300 horas. Para a variação de cor, os grupos que demonstraram um valor de ΔE≥3,3 comparado ao Grupo Seco (controle) foram Água oxigenada, Hipoclorito de sódio e Clorexidina após 30 horas; Água oxigenada, Hipoclorito e Vinagre após 150 horas; Água oxigenada, Hipoclorito e Clorexidina após 300 horas. Considerando as limitações deste estudo, podemos concluir que todas as soluções desinfetantes influenciaram a micro dureza, a rugosidade e a variação de cor na superfície da resina acrílica ativada por micro-ondas. A Clorexidina 2% e o Vinagre 4% foram aquelas que causaram alterações tardiamente (150 horas). As demais soluções causaram alterações desde o primeiro período de avaliação.The aim of this study was to evaluate the micro hardness, roughness and color stability of four disinfecting agents (sodium hypochlorite 1% solution of chlorhexidine digluconate 2%, acetic acid4% and hydrogen peroxide 10v), at different times of immersion. It was made 180 specimens (sp) divided into 18 groups of 10 sp each. The micro hardness, roughness and color of the specimens of these groups were evaluated in three periods of immersion (30, 150 and 300 hours). The obtained results were submitted to Kruskal-Wallis and Dunn’s multiple comparison statics test, with a significant level of 5%. The results of Knoop hardness showed that the groups with statistical differences were Chlorhexidine 30 hours, Hypochlorite150 hours, Hydrogen peroxide and Vinegar 300 hours. For roughness, the groups Hypochlorite, Hydrogen peroxide and Vinegar showed a statistically significant difference in the three times of 30, 150 and 300 hours, while the Chlorhexidine group showed statistically significant differences for the time of 150 hours and 300 hours. For variation of color, the groups showed a clinically unacceptable value (ΔE ≥ 3.3), compared to Dry group (control), were Hydrogen peroxide, Sodium hypochlorite and Chlorhexidine in 30 hours of evaluation; in 150 hours were the groups of Hydrogen peroxide, Hypochlorite and Vinegar and 300 hours were the groups Hydrogen peroxide, Hypochlorite and Chlorhexidine. Among the limitations of this study, we conclude that all the disinfection agents had an influence in the micro hardness, roughness and color variation in the surface of an acrylic resin type 5. Chlorhexidine and Vinegar were the ones that lately showed alterations (150 hours). All the other solutions caused alterations since the first evaluation period

A inserção e o atendimento da Equipe de Saúde Bucal na Estratégia de Saúde da Família São Pedro

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Impact of the implantation of a new curriculum in the process of learning in a Faculty of Dentistry in Brazil

The aim of the present study was to evaluate two dental curricula at a school of dentistry in southern Brazil. The study population included dentists trained in the last two classes of the institution’s old curriculum (n = 98) and graduates of the first two classes of the new curriculum (n = 56). A questionnaire with open and closed questions was used for an overall evaluation of different aspects of the curricula, such as study methods, importance given to basic sciences, quality of theoretical and clinical guidance, perception about skills needed to perform different dental procedures, professional goals and an overall assessment. Students in the new curriculum reported more frequent use of the internet (69.6%) and scientific articles (50.0%). More importance was given to the basic sciences in the new curriculum. Graduates of the old curriculum alleged themselves to be more capable of both performing conventional (99%) and complex amalgam restorations (68.4%), as well as three-unit fixed prostheses (62.2%). Graduates of the new curriculum alleged higher capability with periodontal surgeries (48.2%), treatment of temporomandibular joint (TMJ) disorders (58.1%) and public health planning (78.6%). Regarding professional goals, the new curriculum was associated with an increase in the graduates’ willingness to work in the public health system and to pursue an academic career. New curriculum graduates reported higher overall assessments regarding their educational, as well as theoretical and clinical, outcomes. A new curricular approach was associated with several changes from the perspective of the students

Impact of the implantation of a new curriculum in the process of learning in a Faculty of Dentistry in Brazil

The aim of the present study was to evaluate two dental curricula at a school of dentistry in southern Brazil. The study population included dentists trained in the last two classes of the institution's old curriculum (n = 98) and graduates of the first two classes of the new curriculum (n = 56). A questionnaire with open and closed questions was used for an overall evaluation of different aspects of the curricula, such as study methods, importance given to basic sciences, quality of theoretical and clinical guidance, perception about skills needed to perform different dental procedures, professional goals and an overall assessment. Students in the new curriculum reported more frequent use of the internet (69.6%) and scientific articles (50.0%). More importance was given to the basic sciences in the new curriculum. Graduates of the old curriculum alleged themselves to be more capable of both performing conventional (99%) and complex amalgam restorations (68.4%), as well as three-unit fixed prostheses (62.2%). Graduates of the new curriculum alleged higher capability with periodontal surgeries (48.2%), treatment of temporomandibular joint (TMJ) disorders (58.1%) and public health planning (78.6%). Regarding professional goals, the new curriculum was associated with an increase in the graduates' willingness to work in the public health system and to pursue an academic career. New curriculum graduates reported higher overall assessments regarding their educational, as well as theoretical and clinical, outcomes. A new curricular approach was associated with several changes from the perspective of the students

Performance of progressive and constant tapered instruments rotary systems at canal preparation

Objective: The aim of this study was to compare the performance of two nickel-titanium rotary systems regarding the preparation time, final shape of canal, incidence of aberration, transportation, and fracture of instrument. Methods: A total of 40 simulated canals in resin blocks with 30o curves and a length of 17 mm were divided randomly into two groups: preparation with ProTaper and BioRaCe systems up to F5 and BR5 respectively. Pre- and post-operative canal images were taken and superimposed in order to identify aberrations, transportation, and to take measurements of the canal width. In addition, the preparation time and instrument fractures were recorded. The data were analyzed using Student's t test. Results: There is no difference (p>.05) comparing the systems regarding preparation time, canal aberration, and instrument fracture rates. The progressive tapered instruments of ProTaper prepared significantly larger canal widths in the apical third (p<.05). Conclusion: Overall, both systems provided safe canal preparation, associated with few canal aberrations and instrument fractures