RESUMEN
AIM: The purpose of this study was to evaluate the effect of smear layer on apical seal of endodontically treated teeth. MATERIALS AND METHODS: Sixty freshly extracted human maxillary central incisor teeth were selected and were randomly divided into two experimental groups. Group A of 25 teeth and group B of 25 teeth and a control group of 10 teeth. Cleaning and shaping of the root canals were performed using endodontic K-files up to no. 50 size file in step-back technique. During the process, in root canals of group A, 17% EDTA (ethylenediaminetetraacetic acid) followed by 3% NaOCl (sodium hypochlorite) was used as root canal irrigant. In group B, MTAD (mixture tetracycline citric acid and detergent) was used as a root canal irrigant. In control group, saline was used as root canal irrigant. The root surfaces were then coated with nail polish of both experimental groups and control group. The samples were then immersed in India ink dye for 1 week at 37°C. RESULTS: The statistical analysis of the results showed that the apical leakage was significantly more in teeth, where smear layer was not removed. CONCLUSION: The removal of smear layer improves the longterm apical seal and success of endodontically treated teeth. CLINICAL SIGNIFICANCE: The development and maintenance of apical seal is desirable and considered to be a major prerequisite to improve the outcome of root canal treatment.
Asunto(s)
Recubrimiento Dental Adhesivo , Dentina/patología , Materiales de Obturación del Conducto Radicular/química , Capa de Barro Dentinario , Ápice del Diente/patología , Diente no Vital/terapia , Carbono , Ácido Cítrico/uso terapéutico , Colorantes , Doxiciclina/uso terapéutico , Ácido Edético/uso terapéutico , Resinas Epoxi/química , Gutapercha/química , Humanos , Ensayo de Materiales , Polisorbatos/uso terapéutico , Irrigantes del Conducto Radicular/uso terapéutico , Obturación del Conducto Radicular/métodos , Preparación del Conducto Radicular/instrumentación , Preparación del Conducto Radicular/métodos , Hipoclorito de Sodio/uso terapéutico , Temperatura , Factores de Tiempo , Diente no Vital/patologíaRESUMEN
The long term clinical success of composite restoration depends upon appropriate curing light sources. This in-vitro comparative study investigates the influence of conventional halogen and light emitting diode curing sources on the surface hardness, depth of cure and polymerization shrinkage of composites specimens of 8 mm diameter and 10 mm in height were used to study the depth of cure. Specimens of dimension 8.6 mm in diameter and 2 mm in depth were used to measure the surface hardness and polymerization shrinkage. The results showed that in the long run LED's seem to have great potential to achieve a clinically consistent quality of composite cure.