RESUMEN
The aim of the study was to quantify and compare apical debris extrusion in two systems of continuous and reciprocating rotary instrumentation with, and without, the use of a patency file. An experimental study was carried out in 120 mesial roots of lower first molars, which were randomized in the following 4 groups: Group A. Reciproc (VDW) R25 without a patency file, Group B Mtwo (VDW) without a patency file, Group C Reciproc (VDW) R25 with a patency file and Group D Mtwo with a patency file. Groups A, B and C presented statistically significant differences in comparison to group D, Mtwo with the use of a patency file (p<0.008 to 95% reliability). In conclusion, the greater amount of debris extruded through the apex occurred in roots instrumented with the reciprocating rotary system; this difference was statistically significant in relation to teeth treated with the Mtwo continuous rotary system with the use of a patency file.
El objetivo del estudio fue cuantificar y comparar la extrusión de residuos apicales en dos sistemas de instrumentación endodónticos rotativos, continuo y recíproco, con y sin el uso de una lima de pasaje apical. Se realizó un estudio experimental en 120 raíces mesiales de primeros molares inferiores, que se aleatorizaron en los siguientes 4 grupos: Grupo A. Reciproc (VDW) R25 sin lima de pasaje apical, Grupo B Mtwo (VDW) sin lima de pasaje apical, Grupo C Reciproc (VDW) R25 con lima de pasaje apical y Grupo D Mtwo con lima de pasaje apical. Los grupos A, B y C presentaron diferencias estadísticamente significativas encomparación con el grupo D, Mtwo con el uso de una lima de pasaje apical (p<0.008 a 95% de confiabilidad). En conclusión, la mayor cantidad de residuos extruidos a través del ápice ocurrió en raíces preparadas con el sistema rotativo recíproco; Esta diferencia fue estadísticamente significativa en relación a los dientes tratados con el sistema rotativo continuo Mtwo con el uso de una lima de pasaje apical.
Asunto(s)
Humanos , Preparación del Conducto Radicular/instrumentación , Preparación del Conducto Radicular/métodos , Ápice del Diente , Instrumentos Dentales , Cavidad PulparRESUMEN
Objective Compared with povidone iodine solution to clean,glutaraldehyde immersion,highpressure steam sterilization of three disinfection methods for dental handpiece sterilization effect.Methods Select the 20 dental clinical used over phone,were randomly divided into A group,B group,C group,D group 5,A group for the control group,only cleaning method did not use any disinfection,B group was 1% Polyvinylpyrrolidone iodine solution,wipe,C group were soaked in 2% glutaraldehyde soluton,D group were treated with high-pressure steam sterilization,after each phone were inoculated with bacteria sample dish,the more monitoring of four groups of bacterial culture.Results A group of bacterial culture for the intensive growth of bacteria,B group had bacterial growth for the(+ ～+ + +),bacterial growth;C group had bacterial culturegrowth was(+ ～ + +),bacterial growth;D group of bacterial culture Growth of(-),no bacterial growth.Conclusion High-pressure steam sterilization was the disinfection of dental handpieces most effective way.
RESUMEN
A água do equipo odontológico que resfria os equipamentos giratórios/rotatórios de alta velocidade, como os de alta rotação, pode apresentar número elevado de microrganismos. Assim, os aerossóis formados são fonte de risco de disseminação/contaminação na odontologia. O objetivo desta pesquisa foi avaliar e comparar o nível de bactérias aeróbias mesófilas totais presentes em amostras de água de alta rotação (AR), de 10 equipos odontológicos da Faculdade de Odontologia de Ribeirão Preto - USP, por meio do método tradicional/convencional pour plate e o método rápido Petrifilm AC (3M, St Paul, MN, USA). Cerca de 10,0ml das amostras de água foram coletadas dos AR sem as peças de mão, em tubos de ensaio (25x125mm). As amostras foram homogeneizadas, diluídas, semeadas e incubadas. Todas as amostras de água dos AR estavam altamente contaminadas, não havendo diferença estatisticamente significante (p>0,05) entre o nível de contaminação encontrado pelo método tradicional, comparado com o método rápido. Em conclusão, o método rápido Petrifilm foi considerado mais prático que o tradicional, e totalmente adequado para monitorar a contaminação microbiana das águas dos AR que estavam acima do recomendado pela American Dental Association(<200UFC/ml) e do permitido pela legislação brasileira (<500UFC/ml). Então, para a melhoria da qualidade microbiológica da água de equipos odontológicos, as sugestões dos autores desse trabalho deveriam ser acatadas pelos profissionais da odontologia
Dental units have cold water that supplies gyration/rotation equipments of high-speed, such as highspeedhandpieces, may have a high number of microorganisms. Therefore, aerosol formation is a risksource of microbial dissemination/contamination in dentistry. The aim of this research was to evaluateand compare total aerobic bacteria contamination level in high-speed (HS) water from 10 dental units atFaculty of Dentistry of Ribeirão Preto - USP using a traditional method, pour plate and a fast method, PetrifilmTM AC (3M, St Paul, MN, USA). Approximately 10.0ml of dental unit water were collected from HS, without handpieces, in tubes (25x125mm). The samples were homogenized, diluted, inoculated and incubated. All HS water samples were highly contaminated, no having statistical difference (p>0.05)between contamination level got traditional and fast method. In conclusion, the fast method PetrifilmTM was considered more useful than traditional method, and totally acceptable to monitor the microbial contamination in water from HS that was higher than American Dental Association's recommendation (<200CFU/ml) and allowed for Brazilian legislation (<500CFU/ml). Thus, to improve the water microbiology quality from dental units, the authors´ suggestions this work should be followed by dental professionals