1.Push-out bond strength of a self-adhesive resin cement used as endodontic sealer.
Eduardo Diogo GURGEL-FILHO ; Felipe Coelho LIMA ; Vicente de Paula Aragao SABOIA ; Tauby de Souza COUTINHO-FILHO ; Aline de Almeida NEVES ; Emmanuel Joao Nogueira Leal da SILVA
Restorative Dentistry & Endodontics 2014;39(4):282-287
OBJECTIVES: The aim of the present study was to investigate the bond strength of RelyX Unicem (3M) to root canal dentin when used as an endodontic sealer. MATERIALS AND METHODS: Samples of 24 single-rooted teeth were prepared with Gates Glidden drills and K3 files. After that, the roots were randomly assigned to three experimental groups (n = 8) according to the filling material, (1) AH Plus (Dentsply De Trey GmbH)/Gutta-Percha cone; (2) Epiphany SE (Pentron)/Resilon cone; (3) RelyX Unicem/Gutta-Percha cone. All roots were filled using a single cone technique associated to vertical condensation. After the filling procedures, each tooth was prepared for a push-out bond strenght test by cutting 1 mm-thick root slices. Loading was performed on a universal testing machine at a speed of 0.5 mm/min. One-way analysis of variance and Tukey test for multiple comparisons were used to compare the results among the experimental groups. RESULTS: Epiphany SE/Resilon showed significantly lower push-out bond strength than both AH Plus/Gutta-Percha and RelyX Unicem/Gutta-Percha (p < 0.05). There was no significant difference in bond strength between AH Plus/Gutta-Percha and RelyX Unicem/Gutta-Percha (p > 0.05). CONCLUSIONS: Under the present in vitro conditions, bond strength to root dentin promoted by RelyX Unicem was similar to AH Plus. Epiphany SE/Resilon resulted in lower bond strength values when compared to both materials.
Dental Pulp Cavity
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Dentin
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Resin Cements*
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Root Canal Filling Materials
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Tooth
2.Unfavorable Vascular Anatomy during Endovascular Treatment of Stroke: Challenges and Bailout Strategies
Francisco José Arruda Mont` ALVERNE ; Fabricio Oliveira LIMA ; Felipe de Araújo ROCHA ; Diego de Almeida BANDEIRA ; Adson Freitas de LUCENA ; Henrique Coelho SILVA ; Jin Soo LEE ; Raul Gomes NOGUEIRA
Journal of Stroke 2020;22(2):185-202
The benefit of mechanical thrombectomy (MT) in acute ischemic stroke (AIS) due to large vessel intracranial occlusions is directly related to the technical success of the procedures in achieving fast and complete reperfusion. While a precise definition of refractoriness is lacking in the literature, it may be considered when there is reperfusion failure, long procedural times, or high number of passes with the MT devices. Detailed knowledge about the causes for refractory MT in AIS is limited; however, it is most likely a multifaceted problem including factors related to the vascular anatomy and the underlying nature of the occlusive lesion amongst other factors. We aim to review the impact of several key unfavorable anatomical factors that may be encountered during endovascular AIS treatment and discuss potential bail-out strategies to these challenging situations.