Abstract
Objective : To evaluate, in vitro, the retentive strength between the two-piece zircônia abutments, comparing different types of resin cements.Methods: Thirty zirconia parts manufactured by CAD-CAM technology were divided into three groups, according to the resin cement used for their cementation on the metallic titanium bases: dual-curing self-adhesive, dual-curing conventional and chemically activated. The specimens were stored in distilled water (24 hours, 37°C), followed by thermocycling and submitted to 30 s in baths of 5°C and 55°C, 2 s displacement time, with 6,000 cycles. The mechanical cycling tests werecarried out with specimens submerse in distilled water (37°C), with load of 100N, 2 H z frequency and 200,000 cycles. After thermomechanical tests, the specimens were submitted to a tensile test using a universal testing device until the complete separation of, which were analyzed in stereomicroscope, to determine the cementation failure pattern.Results : The adhesive-type cementation failure occurred in all specimens. The retentive strength values did not differ statistically between the groups.Conclusion : All three tested resin cements provided enough retentive to the two-piece zirconia abutments.
Highlights
The demand for more naturalness in oral rehabilitation promotes the constant emerging of new techniques and of new dental materials, aiming the improvement of teeth esthetics and of gingival tissue
The present study aims to carry out an in vitro comparative analysis of the retentive strength promoted by different resin cements in twopiece zirconia abutments, with cone-morse type prosthetic connections, submitted to thermocycled aging
The tensile strength values registered for cements dual-curing self-adhesive, dual- curing conventional and chemically activated were not statistically different (F=0.29, p=0.745), and the mean values for dual-curing self-adhesive were 354.019 N; for dual- curing conventional, 382.335 N; and chemically activated, 372.048 N (Figure 1)
Summary
The demand for more naturalness in oral rehabilitation promotes the constant emerging of new techniques and of new dental materials, aiming the improvement of teeth esthetics and of gingival tissue. The search for more esthetic delivery culminated with the introduction of zirconia ceramic pillars in the implant-supported rehabilitation [1]. The hybrid zirconia pillars gather both esthetic and compatibility-beneficial properties promoted by the zirconia and favorable mechanical properties of metals [3, 4]. These characteristics allow the fabrication of implant-supported two-piece abutments rehabilitation with natural aspects and, at the same time, resistant. Regardless of connection prosthetic type, zirconia pillars associated with a titanium base promote better mechanical behavior than single-based zirconia pillars [4, 5, 6]
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