The aim of this study was to evaluate the efficacy of different surface conditioning methods on the microtensile bond strength of a restorative composite repair in three types of dental ceramics: lithium disilicate-reinforced, leucite-reinforced and feldspathic. Twelve blocks were sintered for each type of ceramic (n=3) and stored for 3 months in distilled water at 37 °C. The bonding surface of ceramics was abraded with 600-grit SiC paper. Surface treatments for each ceramic were: GC (control)-none; GDB-diamond bur #30 µm; GHF-hydrofluoric acid (10%); GT-tribochemical silica coating (45-μm size particles). Treatments were followed by cleaning with phosphoric acid 37% for 20 s + silane + adhesive. The composite resin was used as restorative material. After repair, samples were subjected to thermocycled ageing (10,000 cycles between 5 °C and 55 °C for 30 s). Thereafter, the samples were sectioned into 1.0 mm 2 sticks and tested for microtensile bond strength with 0.5 mm/min crosshead speed. Data were compared by two-way ANOVA and Tukey's test (α=0.05). The superficial wear with diamond bur proved to be suitable for feldspathic porcelain and for leucite-reinforced glass ceramic while hydrofluoric acid-etching is indicated for repairs in lithium disilicate-reinforced ceramic; tribochemical silica coating is applicable to leucite-reinforced ceramic. Predominance of adhesive failures was observed (>85% in all groups). In conclusion, the success of surface treatments depends on the type of ceramic to be repaired.
O bruxismo cêntrico é uma atividade parafuncional da musculatura da mastigação, caracterizado por ranger e/ou apertamento dentário. Pode ser diurno ou noturno, com causas multifatoriais e sem tratamento específico. Essa estereotipia mandibular dificulta a reabilitação protética e requer experiência profissional. Objetivo: Verificar, na bibliografia da área, a efetividade dos diferentes tipos de próteses dentárias em pacientes bruxistas. Revisão de literatura: Trata-se de uma revisão de literatura integrativa realizada nas bases de dados PubMed, Web of Science, Scielo, Lilacs e Medline, nos idiomas inglês, português e espanhol, com publicações de novembro de 2009- 2019. Resultados: Dos 16 artigos encontrados, nove (56,25%) são relato de caso clínico, nove (56,25%) com bruxismo noturno, em quatro (25%) a overlay restabelecia a dimensão vertical de oclusão (DVO), em dez (62,5%) houve uso de placa miorrelaxante e cinco (31,25%) relataram próteses antigas com danos estruturais. Conclusão: São necessários mais estudos clínicos e com maior número de pacientes para avaliar o desempenho de diferentes tipos de materiais com os quais são confeccionadas as próteses dentárias, a efetividade do restabelecimento da DVO e os tipos de falhas estruturais que mais acometem as próteses dentárias nos pacientes bruxistas.
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