Summary: The purpose of this study was to evaluate in vitro the effectiveness of two endodontic irrigants and their association against Enterococcus faecalis (E. faecalis) by confocal laser scanning microscope (CLSM). Twentyfour bovine incisors were inoculated in a monoculture of E. faecalis for 21 days. After this period, the teeth were divided into three test groups (n ¼ 5) according to the chemical used. Group 1: 2.5% sodium hypochlorite (NaOCl), group 2: 2% chlorhexidine gel (CHX), group 3: 2.5% NaOCl þ 2% CHX gel, and two control groups (n ¼ 3): negative control group (NCG)-sterile and without root canals preparation and positive control group (PCG)-saline. Then, the samples were stained with SYTO9 and propidium iodide and subjected to analysis by CLSM. Bacterial viability was quantitatively analyzed by the proportions of dead and live bacteria in the biofilm remnants. Statistical analysis was performed by the Oneway ANOVA test (p ¼ 0.05). No statistical differences were observed to bacterial viability. According to CLSM analysis, none of the tested substances could completely eliminate E. faecalis from the root canal space. Until now, there are no irrigant solutions able to completely eliminate E. faecalis from the root canal. In this regard, the search for irrigants able to intensify the antimicrobial action is of paramount importance. SCANNING 38:57-62, 2016.

O objetivo do presente estudo foi avaliar as competências em relação às Tecnologias de Informação e Comunicação (TICs) de estudantes de Odontologia. Um estudo transversal foi realizado com os estudantes de Odontologia da Universidade Federal do Rio Grande do Sul, Brasil. Os dados foram coletados através de um questionário previamente validado pelo Centro de Ciências de Saúde Oral da Universidade de Malmö e submetido ao processo de adaptação transcultural para o português. Os resultados foram transformados em escores conforme literatura prévia e categorizados para as comparações. Análise descritiva, qui-quadrado e teste exato de Fischer foram utilizados. O escore de competência em relação às TICs foi considerado muito bom e apresentou relação com o nível de escolaridade materno. Já o escore de importância das TICs foi mediano e relacionado à idade. Concluiu-se que os estudantes de Odontologia apresentaram bom domínio das ferramentas de TICs e nível moderado em relação à importância atribuída ao uso odontológico dessas tecnologias.

In this paper we describe methods for dealing with the trace spectrum of a subgroup of PSL(2, R) generated by four elliptic elements α, β, γ , δ of respective orders 2, 2, 3, 3, satisfying αβγ δ = 1. We give a parametrization and a fundamental domain in the parameter space of such groups. Furthermore we construct an algorithm that decides whether or not a given group is discrete and which moves the discrete groups into the fundamental domain. Our main result is that any two discrete such groups are isospectral if and only if they are conjugate in GL(2, R).In the Appendix we consider pairs of subgroups of PSL(2, R) that arise from nonconjugate maximal orders in a quaternion algebra over a number field. We show that for the isospectrality of such pairs there is a peculiar exception in the case where the groups contain elements of both orders 2 and 3.