ABSTRACT
A busca por materiais livres de metal se intensificou no mercado odontológico. Novos materiais vêm sendo desenvolvidos para atender aos padrões estéticos cada vez maiores por parte de pacientes e profissionais. Entre esses materiais a zircônia tem-se mostrado uma cerâmica promissora para atender a essas exigências. O presente estudo tem como objetivo expor um relato de caso clínico em que uma reabilitação estética de um incisivo central superior tratado endodonticamente, com severa alteração de cor, foi realizada utilizando-se uma coroa total unitária em zircônia associada a pino de fibra de vidro...
The search for metal-free materials has increased in the dental market. New materials have been developed to meet the growing aesthetic standards by patients and professionals. Among these materials zirconia has shown to be a promising ceramic that fulfil these requirements. The aim of this study was to report a clinical case in which the aesthetic rehabilitation of a severely discolored maxillary central incisor was accomplished using a single-unit zirconia crown associated to a glass-fiber post...
Subject(s)
Humans , Male , Adult , Ceramics , Crowns , Esthetics, Dental , IncisorABSTRACT
AIM: To evaluate the effect of unidirectional or woven glass fibre tapes inserted into MOD cavity preparations on the fracture resistance of root filled molar teeth. METHODOLOGY: Extracted human molar teeth were randomly divided into six groups (n = 15) : G1 - sound teeth, control; G2 - MOD cavity preparation; G3 - MOD + root canal treatment (Endo); G4 - MOD + Endo + composite resin restoration (Resin); G5 - MOD + Endo + unidirectional fibre (UF) + Resin; G6 - MOD + ;Endo + woven fibre (WF) + Resin. The teeth were subjected to a compressive fracture test in a universal testing machine. After testing, two failure modes were classified: pulp chamber floor or cusp. RESULTS: The highest and the lowest mean fracture strengths were found in sound teeth (G1) (4960N) and MOD + root canal treatment (G3) (612.84N), respectively, with significant differences from the other groups (P < 0.05). The remaining groups had statistically similar means. In G5 and G6, there was a tendency for fracture to occur in the pulp chamber floor compromising tooth integrity. CONCLUSIONS: The insertion of glass fibres into MOD cavity preparations and restoring them with composite resin was not different than molar teeth filled with composite resin only in terms of fracture resistance. Fibres placed into MOD cavities do not reinforce teeth.
Subject(s)
Dental Materials/chemistry , Dental Restoration, Permanent/methods , Glass/chemistry , Molar/pathology , Root Canal Therapy/methods , Tooth Fractures/physiopathology , Tooth, Nonvital/therapy , Acid Etching, Dental , Bisphenol A-Glycidyl Methacrylate/chemistry , Composite Resins/chemistry , Compressive Strength , Dental Cavity Preparation/methods , Dental Enamel/injuries , Dental Pulp Cavity/injuries , Dental Stress Analysis/instrumentation , Glass Ionomer Cements/chemistry , Gutta-Percha/therapeutic use , Humans , Maleates/chemistry , Materials Testing , Molar/injuries , Root Canal Filling Materials/therapeutic use , Stress, MechanicalSubject(s)
Toxicology , Toxicology , Poisons , Poisoning , Toxins, Biological , Toxicology , Biochemistry , PharmacologySubject(s)
Toxicology , Toxicology , Biodiversity , Poisons , Poisoning , Toxins, Biological , Toxicology , PharmacologyABSTRACT
Salivary gland lysates of the sand fly Lutzomia longipalpis have been shown to enhance the infectivity of Leishmania in mice. As shown herein, the simultaneous inoculation of Leishmania chagasi stationary-phase promastigotes and L. longipalpis salivary gland lysate by the intradermal route in a group of mongrel dogs induced a statistically significant eosinophilia, in relation to dogs inoculated with Leishmania or with salivary gland lysate only. These dogs had no evidence of infection, in spite of the high infectivity of the promastigotes when inoculated by the intravenous route.
Subject(s)
Dog Diseases/parasitology , Eosinophilia/veterinary , Leishmania infantum/physiology , Leishmaniasis, Visceral/veterinary , Saliva/parasitology , Animals , Dogs , Eosinophilia/parasitology , Leishmania infantum/pathogenicity , Leishmaniasis, Visceral/parasitology , PsychodidaeABSTRACT
The intradermal inoculation in naive or in previously sensitized individuals of small amounts of Leishmania extract (Montenegro's skin test) induced or modulated, respectively, the immune response to Leishmania, as assessed by subsequent Montenegro's skin tests. These phenomena could hinder the interpretation of Montenegro's skin tests in a population already subjected to the test in the past and, in addition, could affect in an unknown way the development of mucosal lesions in people infected with L. braziliensis or L. amazonensis, since those lesions have been associated with hypersensitivity to Leishmania antigens. Anti-Leishmania antibody responses, assessed by enzyme-linked immunosorbent assay, were not induced in naive individuals by Montenegro's skin tests, but tended to become more intense following these tests in previously sensitized individuals.
