Filling lateral canals: evaluation of different filling techniques.

OBJECTIVES: The purpose of this in vitro quantitative laboratorial study is to compare the ability of three filling techniques to fill simulated lateral canals. METHODS: Thirty extracted, single-rooted human teeth were used. After cleaning and shaping, three lateral canals were created, one in each third. The teeth were randomly separated into three groups: continuous wave of condensation (Group 1); thermomechanical compaction (Group 2); and lateral condensation (Group 3). The teeth were cross-sectioned, making the cut through points over the lateral canals; thus, 90 specimens were obtained. Each specimen was immersed in a polyester resin, and the blocks were polished. Images were obtained using a stereoscopic lens (40x). Radiographic analysis was performed, followed by a filling linear measure using the Image Tool 3.0 program (University of Texas). Data were statistically analyzed using SPSS 12.0 for Windows (Kruskal-Wallis test). RESULTS: A greater number of simulated lateral canals were obturated in Groups 1 and 2. Group 2 presented the largest percentage of linear measure of lateral canals filling with gutta-percha and sealer. No statistical differences were found between Group 1 and Group 2 when we analyzed the filling with gutta-percha and sealer or just sealer (P>.05). CONCLUSIONS: Thermoplasticized gutta-percha filling techniques (Groups 1 and 2) are better for filling lateral canal with gutta-percha and sealer or with just sealer than lateral condensation (Group 3).

Manchamento por tetraciclina: como tratar? / Tetracycline-stained teeth: how do we treat?

O escurecimento dental de origem medicamentosa pela ingestão da tetraciclina repercute negativamente na aparência do sorriso. Tal alteração causa constrangimento e incômodo ao paciente e preocupa o Cirurgião-Dentista na busca de tratamentos mais conservadores e de menor custo que atendam aos anseios do paciente em possuir um sorriso com harmonia de cor. Para essas situações clínicas são propostas alternativas de tratamento não-invasivas, como o clareamento dental por substâncias químicas, e invasivas, como procedimentos restauradores adesivos. O objetivo deste trabalho é revisar a literatura sobre o mecanismo de ação das tetraciclinas e seus efeitos colaterais nos dentes, bem como discutir as possibilidades de reversão cromática de dentes manchados por tetraciclina através de relato clínico