RESUMO
OBJECTIVES: To investigate the effectiveness of an indicator gel in revealing exposed dentine. METHODS: Teeth prepared into dentine and then stained with the indicator gel were sectioned for histological examination. RESULTS: The indicator gel was found to stain dentine and thin layers of enamel. CONCLUSION: The gel is suggested to be an effective indicator as an aid to acid etching and in the preparation of teeth for resin-bonded restorations.
Assuntos
Dentina/anatomia & histologia , Indicadores e Reagentes , Condicionamento Ácido do Dente , Corantes/administração & dosagem , Colagem Dentária , Preparo da Cavidade Dentária , Esmalte Dentário/anatomia & histologia , Restauração Dentária Permanente , Géis , Humanos , Indicadores e Reagentes/administração & dosagem , TransiluminaçãoRESUMO
The aim of this investigation was the check and evaluation of 7 various dentin adhesives regarding their influence on the connection between dentin resp. enamel and composite filling. For that cylindrical cavities in dental crowns (enamel cavities) and roots (dentin cavities) were prepared and treated with dentin adhesives and composite materials. One part of the test teeth was subjected to loads storage in aqueous solution and thermocycling. The marginal adaptation of the composite filling was checked by means of the dye penetration test. The evaluation was made after cutting the teeth in the stereo microscope TECHNIVAL 2 (Carl Zeiss Jena) at 16-resp. 25 magnifications and defined criteria. The fillings in cavities bound by enamel exhibited a very good marginal adaptation of the composite. The location of the dentin cavity (crown or root dentin) had no significant influence on the fitting of the filling. A clear penetration of dye could be observed with the fillings in the dentin with and without adhesives, which considerably intensified after thermocycling. Best results with regard to the marginal adaptation were obtained with Scotchbond 2, Mirage-Bond and Cavex-Clearfil-Newbond. A restoration without a marginal gap was not possible.
Assuntos
Resinas Compostas/farmacologia , Adesivos Dentinários/farmacologia , Esmalte Dentário/efeitos dos fármacos , Restauração Dentária Permanente , Dentina/efeitos dos fármacos , Humanos , Técnicas In Vitro , Teste de Materiais , Propriedades de Superfície , Raiz Dentária/efeitos dos fármacosRESUMO
S.E.M. comparison studies between different systems for bi- and/or trifurcation treatment, such as special curettes, ultrasonics and rotary diamond burs, were examined at thirty molars. The result show specific rough root surfaces in relation to the individual system. Curettes leaves the roughest root surface.
Assuntos
Dente Molar , Periodontia , Raiz Dentária , Estudos de Avaliação como Assunto , Humanos , Técnicas In Vitro , Microscopia Eletrônica de Varredura , Dente Molar/ultraestrutura , Periodontia/instrumentação , Propriedades de Superfície , Raiz Dentária/ultraestruturaRESUMO
The use of magnifying loupes in dentistry enhances the accuracy of working procedures. The precise fit of laboratory completed restorations can also be more easily controlled. Meticulous tasks such as caries excavation, the bonding technique, restorations, periodontics and surgical procedures are all greatly improved by clearer and better vision. Especially in the relatively new field of restorative cosmetic dentistry, with the adhesive technique, a high level of precise work is required. Caries excavation, enamel etching, bond application, as well as the finishing of restorations with special attention being paid to the enamel area and adjacent teeth are all difficult procedures, and are all greatly simplified by using magnifying loupes.
Assuntos
Assistência Odontológica/instrumentação , Óculos , Humanos , Visão OcularRESUMO
The investigative results showed that preparation of root canals is more effective with ultrasonic as compared to hand instrumentation. Areas like diverticula, canal enlargements or side canals were seen to be extremely clean. This is probably due to the effect of cavitation, implosion of small bubbles, the acceleration of minute particles and the formation of ultra sonic waves. The REM investigation showed no residual bacteria. The hand instrumented canals showed pulp remainders in the canal.
Assuntos
Tratamento do Canal Radicular/instrumentação , Terapia por Ultrassom , HumanosRESUMO
This study showed no difference between the use of the "Piezon Master 400", using four different attachments as compared to the "Hu Friedy" Curettes as far the formation of grooves and scratch marks is concerned. Both root planing methods gave rise to a scalloped surface of the root cement. The ultrasonic root planing however showed a more discrete scalloped surface with very small tears and having a hammered appearance. Hand instrumentation showed much wider tears on the root surface structure.
Assuntos
Raspagem Dentária/métodos , Raiz Dentária/cirurgia , Terapia por Ultrassom/métodos , Raspagem Dentária/instrumentação , Estudos de Avaliação como Assunto , Humanos , Técnicas In Vitro , Microscopia Eletrônica de Varredura , Propriedades de Superfície , Raiz Dentária/ultraestrutura , Terapia por Ultrassom/instrumentaçãoRESUMO
A colour indicator, which was said to be suitable to detect artificially exposed dentine layers, was tested; these layers can be caused by preparations in conjunction with facette treatment, adhesive prosthetic dentistry, as well as smooth-face or dental neck filling therapy; these layers have to be covered before the application of adhesive techniques following the acid cauterization procedure.