Successful endodontic treatment depends on cleaning and disinfecting the root canals, in order to provide conditions for three-dimensional filling, which should prevent root canal reinfection. However, anatomical complexities pose a challenge during endodontic treatment. The present study was a literature review carried out in the following databases: PubMed, SciELO, and MEDLINE, which were searched for articles published from 2017 to 2021. Micro-CT studies published in English, which analysed the capacity for preparation of oval and long-oval root canals, were included. The following keywords were used: “oval-shaped canals,” “long-oval-shaped canals,” “endodontics,” and “micro-CT.” The aim of this study was to carry out a literature review of micro-CT studies on the scope of the capacity for preparation performed in oval and long-oval root canals with rotary and reciprocating instruments.
Este estudo possui como objetivo a descrição do reparo através de um caso clínico de uma lesão periapical difusa e extensa com diagnóstico sugestivo de abscesso periapical crônico. Foram realizados a anamnese e exame clínico. A partir da correta indicação do tratamento endodôntico, foi realizada a abertura coronária e posterior preparo cervical com brocas GattesGlidden, e no preparo cervico-medial, os instrumentos manuais tipo K-Files. Posteriormente, introduziu-se a medicação intracanal à base de hidróxido de cálcio. Após o preparo do canal radicular, o paciente foi submetido a medicação intracanal constituida por hidróxido de cálcio. Após 15 dias, foi constatada a ausência da sensibibilidade referida no início da terapêutica e portanto seguiu-se com a obturação do sistema de canais com a técnica de condensação lateral ativa juntamente com cimento AH-Plus. Foi averiguado por imagens radiográficas no tratamento realizado, que no decorrer das consultas houve uma redução no diâmetro da lesão periapical. Essa redução foi ocasionada por conta da medicação intracanal, que foi renovada a cada mês por um período de seis meses com a finalidade de desinfetar o canal radicular e causar reparação da destruição óssea periapical. Diante disso, a proservação clínica e radiográfica, após um período de seis meses de medicação intracanal, constatou o reparo da lesão periapical.
The present study aimed to evaluate adaptation of the single gutta-percha cone on root canal walls prepared with the two systems, the XP-endo Shaper (XPS; FKG Dentaire, La Chaux-de-Fonds, Switzerland) and ProTaper Next systems (PTN; Dentsply Sirona, Ballaigues, Switzerland) by using micro-computed tomography (micro-CT) technology. Twenty long oval-shaped canals in mandibular incisors were scanned by micro-CT (Skyscan 1172; Bruker microCT, Kontich, Belgium). Two groups were divided into (n = 10) according to the canal preparation protocol: XPS group with an extra 45 s of instrumentation and PTN group. A gutta percha cone, with respect to the protocol used for each group (size 40, .04 taper, XPS and size 40, .06 taper, PTN) was adapted to the canal at the working length of all the samples, and all root canals were filled, using the single-cone technique. The mean values for volume of voids and percentage relative to the mentioned space were correspondingly higher in XPS group than they were PTN group, mean values for volume of voids (3.61 mm3 - 1.92 mm3) and for percentage of voids (39.25% - 23.28%), respectively, significant differences were recorded (p < 0.05) between the two groups (XPS and PTN, Student’s-t test for homogenous variances and Mann–Whitney test). The canals prepared with XPS, in the procedure performed with an extra 45 s of instrumentation, showed a higher volume of voids than those prepared with the PTN system, in obturation of the root canal with the single cone technique.
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