Insights into “bonding” of all-ceramics influenced by cement, sandblasting and water storage time

Crown fracture: Failure load, stress distribution, and fractographic analysis

“…A recent study showed that ZP cement appears to be as effective as resin cement in protecting the ceramic when a micromechanical bond is present. 19 The FEA showed that the stressed conditions were lowest in the DISIL compared with other crowns for all cement combinations. In this model, this could also be attributed to the higher strength of the DISIL material and not its higher elastic modulus because a higher elastic modulus value would increase the stressed condition in a crown (compare FELD and POLYM) for the same strength.…”

“…8,9 The fracture mechanism of a crown restoration is complex and determined by the combined effect of the tooth structure, crown restoration, and the luting agent. [10][11][12][13][14] Several studies have reported that the fracture strength of metalfree restorations is directly related to the cement used, 13,[15][16][17][18][19] but others have found no significant influence of the cement on the fracture load of posterior ceramic crowns. 14,20 A clinical evaluation showed that acid-etched Dicor restorations luted with composite resin exhibited more favorable survivor functions than nonetched Dicor restorations luted with glass ionomer (GI) or zinc phosphate.…”

Tratamento De Superfície E Resistência De União Entre Pinos De Fibra De Vidro E Resina Composta

“…Dessa forma, tem a capacidade de aumentar a molhabilidade do composto resinoso aplicado a superfície do pino. 7,10,12,13 O ácido fluorídrico é comumente utilizado para o tratamento de superfície de cerâmicas, pois este procedimento, seguido da aplicação de silano, produz união clinicamente aceitável da resina composta para cerâmica à base de Sílica 7,11,13,14 . Por outro lado, foi constatado que o ácido fosfórico, quando empregado como método de tratamento de superfície, proporciona pouca alteração superficial na estrutura dos pinos de fibra de vidro, atuando de maneira mais eficiente na limpeza superficial do mesmo…”

“…Os resultados foram avaliados pelo teste de Tukey com significância de 5%. Resultados: Os resultados demostraram que o tratamento de jateamento de óxido de alumínio e silano (12,24 MPa) (G3) apresentou diferença estatisticamente significante comparado com o tratamento de ácido fluorídrico e silano (G2) (8,03 MPa)(p<0,05). O tipo de fratura predominante foi coesiva da resina composta (68,75%) e apenas uma fratura mista (2,08%) foi observada.…”

An insight into current concepts and techniques in resin bonding to high strength ceramics

“…27,32,33,42 APA is performed using 50 lm to 110 lm grain sized aluminium trioxide powder under 0.2 MPa pressure from a distance of 10-25 mm for 13-20 seconds until a white opaque colour appears. Hummel et al stated 'neither stable micromechanical retention nor stable chemical bonds could be achieved without sandblasting'.…”