Resistência flexural em cantiléver de prótese total implantossuportada provisória confeccionada em diferentes materiais

Abstract

Cantilever is used in implant-supported prostheses, resulting in a point of vulnerability under occlusal loads, particularly in case of immediate and/or provisional prostheses. The aim of this study was to evaluate the flexural resistance in the cantilever region of provisional implant-supported prostheses, fabricated over mini abutments cylinders, using three different types of resins. The experimental units consisted of implant-supported prostheses with a 15mm cantilever and 3 levels of resins: conventionally auto-polymerized resin (RA); high resistance thermo-polymerized resin (RD); and conventionally thermo-polymerized denture resin (RT) with metallic structure. Materials and Methods: flexural strength and deflection tests were carried out to determine the load supported in the cantilever region and the maximum displacement values of the samples. Statistical analysis was performed using ANOVA followed by Tukey's test, assuming α=0.05 (Jamovi, The Jamovi Project Version 2.4). Significant differences were detected among groups (P < 0.001): RA 396 N.cm, RD 440 N.cm and RT 553 N.cm. RD group highest deflection values (5.07 mm), followed by RT group (3.93 mm) and RA group (3.37 mm). In the limitations of the present study, high-impact resins could be a viable option for provisional implant – supported full prostheses, presenting superior mechanical behavior when compared to conventional prothesis made with acrylic resin.