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OBJECTIVES: The aim of this cross-sectional retrospective study was to evaluate radiographically the technical quality of root canal treatment performed by undergraduate students using reciprocating NiTi instrumentation and single-cone obturation. METHODS: Endodontic treatment on 1102 teeth performed by undergraduate students from the School of Dentistry of the University of Santa Cecilia (Brazil) was evaluated. All root canal preparations were performed using Reciproc files and were irrigated with 1% NaOCl. The root canal was filled with gutta-percha, along with AH Plus sealer, using the single-cone obturation technique. The technical quality of the root canal treatment was evaluated based on immediate postoperative radiographs. Distance between the end of the filling and the radiographic apex, the filling density, and the taper of the root filling was assessed. Inter-examiner agreement statistic (Kappa) and Chi-square statistic test were used for statistical evaluation of the results. Differences were considered statistically significant when p < 0.05. RESULTS: Anterior teeth, maxillary premolars, and molars presented better results than mandibular premolars and molars (p < 0.05). Mandibular premolars presented a high incidence of a short length of obturation (33.34%) and mandibular molars presented a high incidence of overfilling (6.55%). The majority of the treatment analyzed (62.46%) fulfilled all the criteria showing acceptable working length, taper, and density of obturation. Instrument fractures occurred in eighteen root canals (0.81%). CONCLUSIONS: The use of NiTi reciprocating instruments with the single-cone obturation technique provided an acceptable quality of endodontic treatment in the majority of the cases performed by undergraduate students.

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Introduction: Laser technology is gaining increasing importance in dental practice and also in the field of Endodontics with its ability to promote disinfection and experimentally in the preparation of root canal. The action of different types of lasers results in changes representing the increase in permeability of dentinal tissue (Er: YAG) or sometimes by a decrease in melting and recrystallization of dentin (Nd: YAG). Objective: this study assessed through apical dye leakage, the influence of irradiation with two types of laser, regarding to the quality of apical sealing of endodontic fillings. Material and methods: Thirty-six single-rooted teeth were used after being prepared with the ProFile system up to size #40 instrument and then divided into four experimental and two control groups. The technique used previously to the filling was as follows: G1 - not irradiated; G2 - irradiated with Er: YAG; G3 - irradiated with Nd: YAG and G4 - irradiated with Er: YAG followed by Nd: YAG. After external waterproofing and dry, the specimens were filled with a cold vertical condensation technique, using AH Plus sealer, and immediately immersed into 0.5% methylene blue solution for subsequent cleavage. The linear values of apical marginal leakage were obtained with the aid of an optical microscope connected to a computer using the Image Lab® software. Results: Data analysis showed the non-existence of statistically significant (p = 0.05) differences between different groups. Conclusion: It was concluded that the laser does not have influence on the apical sealing.

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Os casos de reimplante tardio são considerados de prognóstico duvidoso pois a ocorrência de anquilose e reabsorções são fatos comuns para esta condição. Neste sentido, é proposta a utilização de drogas para imersão do dente antes do reimplante visando um favorecimento no prognóstico. Recentemente, o alendronato de sódio tem sido experimentalmente indicado com esta finalidade; porém, a capacidade de adsorção deste medicamento pelo dente é desconhecida. Neste estudo foi avaliada a adsorção de alendronato de sódio pelo dente utilizando-se a Cromatografia Líquida de Alta Eficiência. Para isto, realizou-se a imersão do dente em frascos contendo soluções deste medicamento nas concentrações de 3,2 Zg/ml(10-5M) e 32,0 Zg/ml (10-4M). Após períodos experimentais de 10, 15 e 30 minutos foram retiradas amostras das soluções para análise da concentração que foi comparada com a do controle que continha apenas a solução, sem presença do dente. Os resultados obtidos mostram que o dente adsorve alendronato de sódio quando imerso em solução e que para a concentração de 3,2 Zg/ml são necessários 15 minutos para que a saturação ocorra, já para a concentração de 32,0 Zg/ml uma elevada média de adsorção foi observada após 10 minutos de imersão.

Delayed tooth replantation is considered a poor prognosis because of ankylosis and root resorption occurrence. The use of drugs for topical treatment before replantation is recommended expecting better prognosis. Recently, the sodium alendronate has been experimentally indicated for this purpose; but tooth adsorption capability of this drug is unknown. The aim of this study was to evaluate the tooth adsorption of sodium alendronate utilizing the High Performance Liquid Chromatography. Six maxillary central incisors were immersed in solutions of alendronate in concentrations of 10-5 and 10-4M; after experimental times of 10, 15 e 30 minutes samples of solutions were obtained for concentration analysis. The concentrations obtained were compared with control concentrations (solutions without tooth immersion). The results showed the occurrence of adsorption when teeth were immersed in sodium alendronate solutions. At the concentration of 10-5M it is necessary to keep the tooth immersed for at least 15 minutes, while at the concentration of 10-4M after 10 minutes a high adsorption value is observed.

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Na Endodontia o diagnóstico é de suma importância, pois independentemente das condições clínica e patológica do caso, ele determinará o tratamento a ser realizado. Invariavelmente, a verificação da vitalidade pulpar depende de recursos semiotécnicos específicos, onde se coletam informações através da leitura de sinais e sintomas. Esses testes estão sujeitos a erros de interpretação, pois dependem da estimulação nervosa sensitiva pulpar, não levando em consideração as condições de oxigenação sangüínea, que é o real indicador da vitalidade do tecido. No trauma dentário pode ocorrer uma alteração na vascularização e oxigenação, dificultando o diagnóstico. Os testes fisiométricos avaliam a condição fisiológica do tecido vascularizado, através da análise quantitativa da oxigenação ou do fluxo sangüíneo. O oxímetro de pulso, método não-invasivo e não subjetivo avalia a taxa de saturação de oxihemoglobina, podendo, portanto, ser empregado em Endodontia com finalidade de diagnóstico. O objetivo desta pesquisa foi avaliar in vivo a vitalidade pulpar utilizando a oximetria de pulso em 30 dentes traumatizados e obter parâmetros para discutir a determinação de vitalidade em dentes traumatizados. Os resultados mostraram diferenças de saturação de oxigênio (SaO2) entre traumas de tecido duro (87,5%) ou de suporte (88,5%) e entre aqueles que respondem (90,53%) ou não (86,66%) ao teste térmico, levando a considerar que a oximetria de pulso é um método viável de determinação da vitalidade pulpar, mesmo diante de algumas dificuldades na captação dos sinais e obtenção dos dados.

In endodontics, the diagnostic is very important, because despite of the clinical and pathological condition of the case, it will determine the treatment. Constantly, the diagnostic of pulp vitality depends on diagnosis methods, which information are collected by the signals and symptoms reading. These tests have a jeopardized reading, because they depend on the stimulation of the pulp sensitive nervous, ignoring the conditions of blood oxygenation, that actually indicates the tissue vitality. The dental trauma causes a disturbance in vascularization and oxygenation that makes the diagnostics difficult. Physiometric tests had been invented to evaluate the physiology of the vascularized tissue, making possible to find out the condition of oxygenation or blood flow, such as the pulse oximetry; a non-invasive and non subjective method that estimated the oxihemoglobina saturation values. Therefore, the aim of this research was to evaluate in vivo the pulp vitality using the pulse oximetry in 30 traumatized teeth and to get parameters to argue the determination of the pulp vitality in traumatized teeth. The results showed differences between trauma that affect hard tissues (87.5%) or periodontal tissues (88.5%) and teeth that responses (90.53%) or not (86.66%) to thermal testo Pulse oximetry is a viable method to determine pulp vitality in traumatized teeth despite the difficulties in the attainment of trust worthy values.

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