ANÁLISE DO PADRÃO DE FRATURAS EM PINOS ANATOMIZADOS CIMENTADOS COM DIFERENTES AGENTES CIMENTANTES

The breaking pattern in teeth with glass fiber pins (GFP), anatomized and fixed with different cementing agents, is analyzed in vitro. Thirty bovine mandibular uni-radicular teeth were used. Roots were treated endodontically and randomly divided into two groups according to the cementing agent employed, or rather, G1: auto-adhesive resinous cement (RelyX U200-3M ESPE), and G2: conventional resinous cement (Allcem-FGM). After the anatomization and cementation of pins, the specimens were stored in a buffer at 37oC for 7 days. Roots were then cut under flowing water and six 1mm-thick slices were cut, totaling 180 specimens. The push-out test was performed for all specimens and then placed under a light microscope to assess the type of fracture. The most frequent type of fracture for the two groups comprised coesine in dentin (G1 = 32.2%; G2 = 30%). There was a statistically greater frequency in adhesive failures between dentin and cement in G2 (p=0.007), with a statistically higher frequency (p=0.027) of cohesive fracture in dentin in the third cervical (38.3%) when compared to the third apical (20.0%). Results suggest that auto-adhesive cement (RelyX U200-3M ESPE) had more positive results in the analysis of fracture patterns.