RESUMO
AIM: The aim of the present study was to evaluate whether the use of simplified ethanol-wet bonding (EWB) technique improved the immediate microtensile bond strength (µTBS) between resin composite and caries-affected dentin (CAD). MATERIALS AND METHODS: Twenty-four extracted carious human permanent molars were sectioned to expose the carious lesion. The carious dentin was excavated until CAD was exposed. The samples were divided into two groups: water-wet bonding with Adper Scotchbond Multi-Purpose and a simplified EWB (three 100% ethanol applications for 30 s each), followed by application of an experimental hydrophobic primer and restoration. The samples were vertically sectioned to produce 1 mm × 1 mm thick slabs. The normal dentin (ND) slabs and CAD slabs were identified and were subjected to µTBS evaluation. Slabs from four teeth (two from each group) were evaluated under microscope. Data were analyzed using two-way ANOVA and post hoc Holm-Sidak test at P < 0.05. RESULTS: EWB improved the µTBS in ND but not in CAD group. The dentinal tubules in CAD group showed sclerotic activity with minimal or no hybrid layer. CONCLUSIONS: Simplified ethanol bonding does not improve the bond strength in CAD.
RESUMO
Loss of an organ such as a finger not only imposes a functional impairment, but also leads to unaesthetic appearance and a deep psychological stigma to the patient. Hence replacement of such missing finger with the help of an artificial finger prosthesis has been very successful. The success of the prosthesis depends on the precision in meticulous planning and designing of prosthesis, technique of fabrication and the materials used. This article describes fabrication of a finger prosthesis by a modified technique, by making a metal conformer with a wire mesh. This design offers maximum retention and excellent aesthetics, thereby imparting a lifelike appearance to the hand with missing finger.
RESUMO
AIM: The purpose of the present study was to comparatively evaluate the effect of presence of a 2 mm ferrule and different type of dowels on fracture resistance of mandibular premolars. MATERIALS AND METHODS: Fifty uniradicular mandibular premolars were divided into five groups (n = 10). Ten teeth received no treatment (group I). Samples in group II & III were decoronated 2 mm above cemento-enamel junction and received custom cast dowel-core and fiber dowel-composite core respectively, with 2 mm ferrule. Samples in group IV & V were decoronated at CEJ and were restored using cast dowels and fiber dowel-composite cores, without any ferrule. The restored teeth received metal ceramic crowns and were mechanically loaded. The specimens were subjected to a static load, until fracture, to determine the fracture resistance and fracture mode. RESULTS: The samples with 2 mm ferrule had a higher fracture resistance than non ferrule groups. Within non ferrule groups, there were no significant differences in the fracture resistance. Specimen restored with cast dowel had more incidence of non-repairable fracture. CONCLUSIONS: Presence of ferrule increased the fracture resistance of endodontically treated teeth. In case of absence of ferrule, fiber dowels had similar fracture resistance as that of cast dowels and showed increased incidence of repairable fracture.
