RESUMEN
The aim of this study was to evaluate the effect of different post-space treatments on the push-out bond strength and failure modes of glass fibre posts. Forty mandibular premolar roots were cut and endodontically treated. Post spaces were prepared and roots were divided into four groups. In group 1 distilled water irrigation (control), in group 2 2.25% NaOCl irrigation, in group 3 2.25% NaOCl + 17% EDTA irrigation were done and in group 4 diode laser was applied to the prepared post spaces. Scanning electron microscope (SEM) analysis was made for each group. Fibre posts were then luted with resin cement. Each root was prepared for push-out test. Data were statistically analysed with anova (P = 0.05). After push-out test, the failure modes were observed but not statistically analysed. There were statistically significant differences between Group 3 and Group 2 in both regions (P < 0.05), also in the middle region of Group 4 and Group 2 (P < 0.05). Cervical root segments showed higher bond strengths than middle ones in all groups (P < 0.05). The highest bond strength values were obtained from NaOCl/EDTA and the lowest bond strength values were obtained from NaOCl for both regions.
Asunto(s)
Recubrimiento Dental Adhesivo , Materiales Dentales/química , Vidrio/química , Técnica de Perno Muñón/instrumentación , Preparación del Conducto Radicular/métodos , Diente no Vital/terapia , Diente Premolar , Resinas Compuestas/química , Diseño de Prótesis Dental , Cavidad Pulpar/patología , Cavidad Pulpar/efectos de la radiación , Análisis del Estrés Dental/instrumentación , Dentina/patología , Dentina/efectos de la radiación , Ácido Edético/uso terapéutico , Humanos , Láseres de Semiconductores/uso terapéutico , Terapia por Luz de Baja Intensidad/instrumentación , Microscopía Electrónica de Rastreo , Cementos de Resina/química , Irrigantes del Conducto Radicular/uso terapéutico , Preparación del Conducto Radicular/instrumentación , Capa de Barro Dentinario , Hipoclorito de Sodio/uso terapéutico , Estrés Mecánico , Propiedades de SuperficieRESUMEN
The objective of the study was to observe the morphological changes on root canal dentin after Er:YAG laser and Nd:YAG laser treatment. Twenty-one teeth biomechanically prepared were divided into three groups with seven teeth of each. Group A was unlased as a control. In group B, Er:YAG laser and in group C, Nd:YAG laser was applied to the root canal dentin. The roots were split longitudinally and examined using a scanning electron microscopy for the evaluation of debris, smear layer, and recrystallization. There was no statistically significant difference between the groups. This study indicates that laser beam is not effective in removing debris and smear layer.