No abstract

The purpose of this study was to compare the apical sealing of root canals obturated with different techniques. One hundred-six human mandibular incisors were submitted to instrumentation by means of the step-back technique. After instrumentation, one hundred teeth received an impermeable coating on the external surfaces of the crown and root (except for the area nearby the apical foramen). Afterwards, they were divided in five groups containing twenty elements each, according to the obturation technique employed: 1. lateral condensation with Kerr file; 2. continuous wave of condensation technique with System B; 3. thermoplasticized injectable gutta-percha technique with the Ultrafil system; 4. mechanically thermoplasticized gutta-percha with the JS Quick-Fill system and 5. thermoplasticized gutta-percha associated to a master cone with the Microseal system. The six remaining teeth were employed as negative and positive controls. After obturation, the access cavities were sealed and the teeth were immersed in aqueous 2% methylene blue dye for 72 hours at 37ºC. After that, the teeth were longitudinally sectioned and the apical microleakage was evaluated in a stereomicroscope. The Microseal system presented the best apical sealing ability, followed by System B, JS Quick-Fill, Ultrafil and the lateral condensation technique. The statistical analysis of the results demonstrated that: 1. the Microseal system presented an apical sealing similar to System B and better than the other groups; 2. System B presented better apical sealing than the lateral condensation technique, being similar to the other groups; and 3. the lateral condensation, Ultrafil and JS Quick-Fill groups demonstrated similar sealing ability.

No abstract

Root canal preparation has been considered one of the most important steps in root canal therapy, thus many techniques and instruments have been developed. The aim of this study was to evaluate the cleaning of the root canal through three different instrumentation techniques. Thirty mandibular incisors were selected and submitted to lingual access cavities. Afterwards, the canals were filled with India ink dye previously stored in carpules, which was inserted into the root canal by means of anesthetic syringe and anesthetic needles. After 48 hours, during which the dye was allowed to dry inside the root canal, the teeth were divided in three groups: G1- GT rotatory instrumentation; G2- manual instrumentation; G3- association of both. After instrumentation, the teeth were longitudinally sectioned. The cleaning process accomplished through the different instrumentation techniques was evidenced by dye removal at the cervical, middle and apical thirds of the root canal. The results of this study showed that were not statistically significant differences between these three instrumentation techniques for all three thirds of the root canal.

Aos meus pais Wantuir e Wadet, que sempre me incentivaram para que eu pudesse conquistar meus objetivos. Vocês são meu ponto de referência; meu maior exemplo de amor, carinho, simplicidade e honestidade. Tudo o que tenho hoje devo, exclusivamente, a vocês. Tenho orgulho em ter pais tão maravilhosos! A toda minha família, em especial aos meus irmãos Willian, Waldir e Walquíria e aos meus sobrinhos, por estarem sempre presentes na minha vida e fazerem parte da minha história. Vocês moram no meu coração. Ao meu namorado Fábio, pelo carinho e amor que você me transmite diariamente, mesmo a distância. Ao meu orientador Prof. Dr. Norberti Bernardineli, "O aprendizado nunca termina. Não existe parte da vida que não contenha lições. Se você está vivo, há lições para aprender." (Anônimo) Por me ajudar a concretizar mais essa "lição da minha vida" através de uma orientação precisa e minuciosa; Pelos ensinamentos, pela paciência, respeito, confiança e, principalmente, pela grande amizade durante a nossa convivência;