Aim:The aim of this study is to assess three protocols for removing a eugenol-based filling endodontic sealer from root dentin and the bond strength of fiberglass posts luted with resin cement. Materials and methods: Sixty single-rooted bovine teeth were prepared and filled with the Endofill endodontic sealer and gutta-percha cones. After 7 days, 9 mm of the filling was removed and divided into five groups (n = 12) according to the cleaning protocol: G1 (negative control), unfilled; G2 (positive control), saline solution; G3, 95% alcohol; G4, amyl acetate; and G5, Largo bur. The canals were hybridized and fiberglass posts were luted with resin cement. They were cross-sectioned in slices of 1 mm and subjected to the push-out test. The other samples were sectioned longitudinally and visualized in a scanning electron microscope (SEM), and the existing chemical elements were quantified by energy dispersive spectroscopy (EDS). The statistical analysis used variance analysis (ANOVA)-one way and Fisher's test, at a 5% significance level. Results: The 95% alcohol was more effective for cleaning the canal, resulting in a clean dentinal surface and bond strength statistically similar to the negative control. The Largo bur was also statistically similar to the negative control, with only a few debris impregnated on the wall. Amyl acetate showed more sealer residues on the canal walls, with a consequent lower bond strength value than the other groups, only higher than the positive control. Conclusion:The 95% alcohol and Largo burs may be used after removing the canal filling, so that the bond strength is improved when using the eugenol-based sealer.

ResumoIntrodução: A procura dos pacientes pela estética dentogengival tem aumentado significativamente nos últimos anos, sendo um conceito complexo devido aos inúmeros fatores envolvidos para a obtenção da satisfação paciente/profissional. Algumas características dentogengivais podem alterar a harmonia do sorriso como por exemplo o excesso de exposição gengival. Objetivo: Avaliar se a presença da exposição gengival tem uma influência negativa na percepção da estética dentogengival. Material e método: 180 indivíduos (60 dentistas, 60 acadêmicos de odontologia e 60 pacientes) avaliaram imagens de sorrisos de voluntários. Essas imagens foram alteradas digitalmente pelo software Adobe Photoshop™, criando diferentes situações de exposições gengivais (4 mm, 2 mm, 0 mm, -2 mm, -4 mm), e classificados pelos avaliadores através dos escores: (01) sorriso muito agradável, (02) agradável e (03) desagradável. Os escores atribuídos foram analisados por meio da ANOVA (α=0,05). Resultado: Exposições gengivais entre 0 e 2 mm foram consideradas esteticamente agradáveis. Alterações de -4 e +4 mm foram definidas como as mais desarmônicas. O sorriso de 0 mm no sexo feminino foi considerado mais harmônico para os dentistas (1,51) e estudantes de odontologia (1,77), pelo teste t de Student (p<0.05). Na opinião dos pacientes o sorriso de +2 mm foi considerado o mais estético. Na avaliação das imagens do sexo masculino, o sorriso de 0 mm foi considerado o mais estético (p<0,05), para dentistas (1,85) e estudantes de odontologia (1,62). Os pacientes consideraram +2 mm de exposição gengival como o sorriso mais harmônico. Conclusão: A percepção estética de estudantes de odontologia e cirurgiões dentistas foram diferentes quando comparado ao grupo dos pacientes.Descritores: Estética; sorriso; gengiva. AbstractIntroduction: Patients' demand for dentogingival aesthetics has increased significantly in recent years, and this is a complex concept due to numerous factors involved in obtaining patient/professional satisfaction. Some dentogingival features may alter smile harmony, such as excessive gingival display. Objective: To evaluate whether the presence of gingival display has a negative influence on the perception of dentogingival aesthetics. Material and method: 180 individuals (60 dentists, 60 dental students, and 60 patients) evaluated images of volunteer smiles. These images were digitally altered by the Adobe Photoshop™ software, creating different situations of gingival display (4 mm, 2 mm, 0 mm, -2 mm, -4 mm), and graded by the evaluators with the following scores: (01) very pleasant smile, (02) pleasant smile, and 03) unpleasant smile. The scores assigned were analyzed using ANOVA (α=0.05). Result: Gingival displays between 0 and 2 mm were considered aesthetically pleasing. Changes of -4 and +4 mm were defined as the most disharmonious smiles. The 0-mm female smile was considered the most harmonious for dentists (1.51) and dental students (1.77), by Student's t test (p<0.05). In the opinion of patients, the smile of +2 mm was consider...

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This study objectives to evaluate the fracture strength of upper central incisors (UCI) restored with composite resin (CR) in Class III cavities and endodontically treated teeth with or without glass fiber post (GFP), analyzing their failure mode. Sixty human UCI were randomly divided into four experimental groups: endodontically treated teeth without GFP (G1), endodontically treated teeth with GFP (G2), teeth with mesial/distal Class III cavities restored with CR without GFP (G3), and teeth with mesial/distal Class III cavities restored with CR with GFP (G4). The samples were submitted to the fracture strength test in a universal testing machine with a compression shear load applied at speed of 1.0 mm/min until fracture occurred. The data were submitted to one-way ANOVA (α=0.05) and the samples were analyzed for failure mode. The analysis did not show a significant statistical difference in fracture strength between the groups (p>0.05). The results showed that only endodontically treated teeth (G1) (753.4N) presented behavior similar to teeth with GFP (G2) (702.1N). The same occurred when comparing teeth with Class III cavities without GFP (G3) (670.2 N) and with GFP (G4) (746.1N). It can be concluded that glass fiber posts do not change the fracture strength of incisors with endodontic treatment and Class III cavities.