RESUMEN
STATEMENT OF PROBLEM: Endodontically treated teeth are known to have reduced structural strength. Glass fiber posts may influence fracture resistance and should be evaluated. PURPOSE: The purpose of this study was to evaluate the influence of glass fiber post length on the fracture resistance of endodontically treated teeth. MATERIAL AND METHODS: Forty intact human maxillary canines were selected and divided into 4 groups, the control group consisting of teeth restored with a custom gold cast post and core, with a length of two-thirds of the root. Other groups received prefabricated glass fiber posts in different lengths: group 1/3, removal of one-third of the sealing material (5 mm); group 1/2, removal of one-half of the sealing material (7.5 mm); and group 2/3, removal of two-thirds of the sealing material (10 mm). All the posts were cemented with resin cement, and the specimens with glass fiber posts received a composite resin core. All the specimens were restored with a metal crown and submitted to a compressive load until failure occurred. The results were evaluated by 1-way ANOVA, and the all pairwise multiple comparison procedures (Tukey honestly significantly difference test) (α=.05). RESULTS: The ANOVA showed significant differences among the groups (P<.002). The Tukey test showed that the control group presented significantly higher resistance to static load than the other groups (control group, 634.94 N; group 1/3, 200.01 N; group 1/2, 212.17 N; and group 2/3, 236.08 N). Although teeth restored with a cast post and core supported a higher compressive load, all of them fractured in a catastrophic manner. For teeth restored with glass fiber posts, the failure occurred at the junction between the composite resin core and the root. CONCLUSION: The length of glass fiber posts did not influence fracture load, but cast post and cores that extended two-thirds of the root length had significantly greater fracture resistance than glass fiber posts.
Asunto(s)
Materiales Dentales/química , Diseño de Prótesis Dental , Vidrio/química , Técnica de Perno Muñón/instrumentación , Fracturas de los Dientes/fisiopatología , Diente no Vital/fisiopatología , Cementación/métodos , Resinas Compuestas/química , Coronas , Diente Canino/fisiopatología , Aleaciones Dentales/química , Fracaso de la Restauración Dental , Análisis del Estrés Dental/instrumentación , Aleaciones de Oro/química , Humanos , Ensayo de Materiales , Cementos de Resina/química , Estrés Mecánico , Propiedades de Superficie , Raíz del Diente/lesiones , Diente no Vital/terapiaRESUMEN
El surco palatogingival es una anomalía de desarrollo dentario que ocurre principalmente en la cara palatina de los incisivos laterales superiores. A pesar de que su etiología no es totalmente comprendida, los defectos morfológicos decurrentes de una existencia pueden causar el fracaso del tratamiento odontológico. Al depender de su extensión, localización y profundidad, se tornan factores predisponentes para la aparición de enfermedades inflamatorias en los tejidos pulpares, periapicales y periodontales. En este estudio comentaremos a través de una revisión de literatura factores importantes para el conocimiento de esta anomalía, sus posibles consecuencias y el tratamiento indicado (AU)
The palato-gingival Groove is an anomaly of dental development that occurs mainly in the palatal aspect of maxillary lateral incisors. Although its etiology is not fully understood, the morphological defects resulting from complications wich can be responsible by the failure of dental treatment. By reling on its size, location and depth, become factors predisposing to the development of inflammatory diseases in the pulp, periapical and periodontal tissues. In this study we will discuss trough a literature review, important factors for knowledge factors for knowledge of this anomaly, its consequences, and the correctly treatment (AU)