RESUMEN
OBJECTIVE: To study the dynamics of changes in the adhesion between the composite and dentin of the tooth when using different volumes of a single-component adhesive system in case of contamination of it with human blood plasma. MATERIAL AND METHODS: To achieve this goal, the following were used: extracted human teeth, XP Bond one-component adhesive systems (DENTSPLY, Germany), Esthet X HD micrometric restoration material (DENTSPLY, Germany), and centrifuged blood plasma. The strength of the adhesive bond between the composite material and the hard tissues of the tooth was studied using a shear test machine Zwick Roell Z 010 («Zwick¼, Germany). RESULTS: The use of a single-component adhesive system in an amount of 17.7 mg (1 drop from a dispenser) for treating open dentin makes it more resistant to contamination compared to using the same adhesive, but in an amount of 6.6 mg (the amount of adhesive that adsorbs a medium-sized dental take). A decrease in the adhesion force between the composite material and tooth hard tissues from 1.5 to 17.7% occurs when a single-component adhesive system weighing 17.7 mg of blood plasma simulating a dentinal fluid weighing from 0.2 to 2.0 mg enters. The ingestion of the same amount of blood plasma in a single-component adhesive system weighing 6.6 mg leads to a decrease in its adhesion from 4.3 to 43%.
Asunto(s)
Recubrimiento Dental Adhesivo , Resinas Compuestas , Cementos Dentales , Análisis del Estrés Dental , Dentina , Humanos , Ensayo de Materiales , Cementos de Resina , Resistencia al CorteRESUMEN
OBJECTIVE: To assess the degree of influence of human blood plasma simulating dentinal fluid on the composite resin adhesion to dental hard tissues. MATERIAL AND METHODS: The strength of the adhesive bond between the composite material and dental hard tissues was studied using a shear test machine Zwick Roell Z 010 («Zwick¼, Germany) on extracted human teeth. XP Bond one-component adhesive system and XENOV self-etching adhesive system (DENTSPLY, Germany), high-definition micrometric restoration material Esthet X HD (DENTSPLY, Germany), as well as centrifuged blood plasma were used. RESULTS: Adhesion strength decreased by 26-78% when blood plasma weighing from 0.2 to 2.0 mg mixed up the self-etching system (weight 6.6 mg). A significant decrease in the adhesion force occurred when plasma with a mass of 0.7 mg or more mixed up with the monomer (a decrease in adhesion by 19.1%). A critical decrease in the adhesion force (43% or more) occurred with the mixture of blood plasma weighing 2.0 mg or more.
Asunto(s)
Recubrimiento Dental Adhesivo , Grabado Ácido Dental , Resinas Compuestas , Cementos Dentales , Análisis del Estrés Dental , Humanos , Ensayo de Materiales , Cementos de Resina , Resistencia al Corte , Propiedades de SuperficieRESUMEN
OBJECTIVE: To study the hydrodynamics of the dentinal fluid along the dentinal tubule in the event of its opening as a result of mechanical and acid treatment of the dental crown dentin. Material and methods: A licensed version of the ANSYS / FLOTRAN computer program was used, which is a software tool for solving various problems of hydrodynamics, including laminar and turbulent flow of an incompressible or compressible fluid. RESULTS: The results of computer simulation showed that 1.5 ms after drying of the dentin tubule (length 6 mm) it is refilled with dentin fluid, which then begins to accumulate on the treated surface of the dental hard tissues. Reducing the length of the dentinal tubule as a result of the cavity preparation leads to an increase in the speed and mass of pulp fluid released through it.
Asunto(s)
Líquido de la Dentina , Hidrodinámica , Simulación por Computador , Coronas , DentinaRESUMEN
The paper describes a method of root canal retreatment that enables by means of CT data, laser surface scanning of teeth and a number of software to create plastic templates making possible successful retreatment with minimal risk of complications. The effectiveness of the method was evaluated in vitro on 10 extracted teeth. Application of the method in clinical practice enables the highest degree of accuracy and security of the procedure.
Asunto(s)
Simulación por Computador , Obturación del Conducto Radicular , Caries Radicular/terapia , Diente Premolar/diagnóstico por imagen , Cavidad Pulpar/diagnóstico por imagen , Humanos , Retratamiento , Caries Radicular/diagnóstico por imagen , Tomografía Computarizada por Rayos XRESUMEN
A new method for the treatment of apical periodontitis, making use of Optodan laser, differs from the known method by more rapid periapical tissue regeneration, which is paralleled by high antiinflammatory effect of magnetic laser therapy at early stages of treatment.
Asunto(s)
Terapia por Luz de Baja Intensidad/métodos , Magnetismo/uso terapéutico , Periodontitis Periapical/radioterapia , Adolescente , Adulto , Anciano , Humanos , Persona de Mediana Edad , Periodontitis Periapical/fisiopatología , Regeneración/efectos de la radiación , Diente/fisiología , Resultado del TratamientoRESUMEN
Clinical analysis of the efficacies of evikrol and stomadent used to replace dental hard tissue defects in children has shown similar results, but stomadent is preferable because the filling made of it virtually does not change its color. The authors claim that the development of such complications as caries recurrence, change of the color of the filling in sites of their union with dental tissues, abnormal edge union is related to the technique of enamel acid tanning of immature children's teeth, that should be modified.