The aim of this study was to evaluate the influence of a novel ultrasonic tip as an auxiliary method for removing filling material from flattened/oval-shaped canals. The null hypothesis tested was that this method does not influence removing the filling material in flattened/oval-shaped canals. Forty-five mandibular incisors were selected and randomly divided into three experimental groups (n = 15) according to different protocols for removing root canal filling material. Group R: Reciproc R25/.08, Group RC: Reciproc R25/.08 + Clearsonic tip, and Group CR: Clearsonic tip + Reciproc R25/.08. The teeth were scanned pre and post-operatively by means of a micro-computed tomography system. Data were analyzed using non-parametric Kruskal-Wallis and Dunn tests (p < 0.05). The percentage of residual root canal filling material between the experimental groups was examined. Statistically significant differences between the experimental groups were found in the root canal. Group R had the highest percentage of residual root canal filling material when compared with Groups RC and CR. The lowest percentage of residual root canal filling material was observed in Group CR. In the apical third of the root canal, statistically significant differences were found between the different protocols. The use of the ClearSonic tip followed by the Reciproc 25/.08 file to remove filling material resulted in the lowest percentage of residuals in the whole root canal and in the apical third.

To evaluate the influence of novel ultrasonic tips as an auxiliary method for the rotary preparation of flattened/oval-shaped canals. Fortyfive mandibular incisors were selected and divided into one of three experimental groups (n = 15): Group PFCP-ProDesign Logic 25/.05 + Flatsonic + Clearsonic + Prodesign Logic 40/.01; Group FCP-Flatsonic + Clearsonic + ProDesign Logic 40/.01; and Group PP-Prodesign Logic 25/.05 + Prodesign Logic 40/.05. The teeth were scanned preoperatively and postoperatively using microcomputed tomography. The percentage values for increase in volume, non-instrumented surface area, dentin removal, degree of canal transportation, and centering ratio between the experimental groups were examined. Data were analyzed using the non-parametric Kruskal-Wallis and Dunn's tests (p < 0.05). Group PFCP showed the greatest volume increase in the total portion of the root canal and the lowest percentage of non-instrumented surface area. Regarding the degree of transportation in the buccolingual direction, statistically significant differences between groups PFCP and PP were observed at the coronal third of the canal. In the mesiodistal direction, no statistically significant differences were observed at the coronal, middle, and apical thirds. As for the centering ratio, statistically significant differences were found in the buccolingual direction. In the mesiodistal direction, no statistically significant differences were observed at the coronal, middle, and apical thirds. The use of novel ultrasonic tips combined with rotary instruments in group PFCP provided a significant increase in volume and reduced the percentage of non-instrumented areas during the preparation of flattened/oval-shaped canals.

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Os bisfosfonatos são drogas frequentemente empregadas para o tratamento de osteoporose, osteogênese imperfeita e doenças malignas. No ano de 2003 foi estabelecida pela primeira vez a relação entre o consumo desses medicamentos e a aparição de exposições ósseas nos maxilares, lesão denominada como osteonecrose dos maxilares induzida por bisfosfonatos. Por este motivo, torna-se oportuno para o profissional na área da saúde o conhecimento sobre os tipos de bisfosfonatos e seus mecanismos de ação. O objetivo do presente estudo foi realizar uma revisão da literatura sobre a osteonecrose dos maxilares associada ao uso de bisfosfonatos. Os autores selecionaram estudos sobre o assunto, coletados a partir das bases de dados EBSCO, ScienceDirect e PUBMED, e pesquisaram as características clínicas e radiográficas da patologia, sendo identificados os fatores de risco e estágios de desenvolvimento associados a esta doença. A discussão foca-se nas medidas preventivas para pacientes suscetíveis na abordagem clínica recomendada por expertos e nas melhores alternativas de tratamento para a osteonecrose dos maxilares em pacientes sob tratamento com bisfosfonatos. O odontólogo é o profissional responsável pelo diagnóstico correto e o tratamento desta doença, que deve ser escolhido com base nas condições particulares de cada paciente e sob o alicerce científico pertinente.