Resistencia a la fractura de dientes tratados endodónticamente restaurados con dos materiales de fibra de vidrio

Abstract

Introduction: The restoration of endodontically treated and structurally compromised teeth remains a clinical challenge, particularly due to the lack of solid evidence regarding the mechanical resistance of the most commonly used restorative materials. Objective: To compare the fracture resistance of endodontically treated teeth with substantial structural loss, restored with fiber-reinforced composites using fiberglass ribbons versus fiberglass posts. Methodology: Forty bovine mandibular incisors were prepared and received root canal treatment. The canal filling was removed up to 50% of the root length in the teeth restored with posts, and up to 4 mm in the teeth restored with fiberglass ribbons, leaving a 2-mm ferrule to place the posts and fibers. The samples were divided into two groups according to the type of restorative material: fiberglass ribbons and fiberglass posts. The fiberglass posts (Fiber Post Coltene) ® were cemented with a dual-cure resin cement (Paracore, Coltene) ®, which was also used for the core build-up. The fiberglass ribbon used was Interlig (Angelus) ®, and the core build-up was performed with Paracore (Coltene) ®. All procedures were carried out in accordance with the manufacturers’ instructions. All samples were subjected to compressive loading, and both the fracture load and the fracture pattern were recorded. Data were entered into an Excel spreadsheet and analyzed using STATA 17. Results: The compressive tests conducted with the Shimadzu universal testing machine (AGS-X model, Japan) showed notable differences between the two materials: the fiberglass ribbons required less force to reach fracture, although the differences were not statistically significant. Regarding the type of fracture, the results favored the posts (p = 0.004), while the ribbon group showed a higher prevalence of unfavorable fractures. In terms of fracture location, coronal fractures were more frequent in the post group (p = 0.010), whereas unfavorable fractures in the ribbon group tended to occur in the cervical and middle thirds. Conclusion: Fiberglass posts demonstrate greater resistance to compressive forces, and the fractures observed in teeth restored with posts were more favorable.