Endodontic filling removal procedure: an ex vivo comparative study between two rotary techniques

In this study, we compared the ex vivo removal capacity of two endodontic rotary techniques and determined whether there was a significant quantitative difference in residual material when comparing root thirds. Forty extracted molars were used. The palatal roots were selected, and the canals were prepared using a step-back technique and filled using a lateral condensation technique with gutta-percha points and Endofill sealer. After two weeks of storage in a 0.9% saline solution at 37ºC in an oven, the specimens were divided into 2 groups of 20, with group 1 samples subjected to Gates-Glidden drills and group 2 samples subjected to the ProTaper retreatment System. Hedstroem files and eucalyptol solvent were used in both groups to complete the removal procedure. Then, the roots thirds were radiographed and the images were submitted to the NIH ImageJ program to measure the residual filling material in mm. Each root third was related to the total area of the root canals. The data were analyzed using Student's t test. There was a statistically significant difference between the two techniques as more filling material was removed by technique 2 (ProTaper) than technique 1 (Gates-Glidden drills, p < 0.05). The apical third had a greater amount of residual filling material than the cervical and middle thirds, and the difference was statistically significant (p < 0.05). None of the selected techniques removed all filling material, and the material was most difficult to remove from the apical third. The ProTaper files removed more material than the Gates-Glidden drills.

Conduta endodôntica pós-trauma em dente com rizogênese incompleta / Endodontic conduct post trauma in teeth with incomplete root formation

Neste artigo, descreve-se o tratamento endodôntico de um incisivo central superior esquerdo com rizogênese incompleta que, após trauma, apresentou fratura coronária e abscesso dentoalveolar agudo evoluído. O tratamento instituído foi a desinfecção e o esvaziamento do conteúdo séptico do canal radicular, seguido de medicação intracanal em forma de pasta à base de hidróxido de cálcio, renovada periodicamente com o intuito de promover a formação de uma barreira apical mineralizada (apicificação). Após comprovação clínica e radiográfica do fechamento apical sete meses após o início do tratamento, o canal foi obturado definitivamente por meio da técnica do cone de guta-percha rolado associado ao cimento Sealer 26. Proporcionou-se, portanto, o retorno das condições de saúde do dente em questão, evitando, assim, a sua perda prematura.

This article describes the endodontic treatment of an upper left central incisor with incomplete root formation which, after trauma, presented crown fracture and developed acute dentoalveolar abscess. The treatment used was the disinfection and emptyness of the septic root canal content, followed by intracanal medication in a paste formwith its basis of calcium hydroxide, renewed periodically with the aim to promote the formation of a mineralized apical barrier (apexification). After clinical and radiographic proof of the apical closure, seven months after starting treatment, the canal was permanently filled through the rolled gutta-percha cone technique, associated to Sealer 26. This procedure provided the returns of the healthy conditions of the tooth, thus avoiding its premature loss.