Silane influence on bonding to CAD-CAM composites: An interfacial fracture toughness study.

Biomaterials; Composite cement; Dental materials; Dental prosthesis retention; Fracture mechanics; High-temperature high-pressure polymerization; Notchless triangular prism test; Polymer-infiltrated ceramic network; Prosthetic dentistry; Surface roughness

Abstract :

[en] OBJECTIVES: To evaluate silane influence on the interfacial fracture toughness (IFT) of composite cement, with the two sub-classes of CAD-CAM composites, polymer-infiltrated ceramic networks (PICN) and dispersed fillers (DF), after hydrofluoric acid etching (HF) or airborne-particle abrasion (AB). A secondary objective was to correlate results with developed interfacial area ratio (Sdr) and surface wettability. METHODS: Experimental PICN and DF blocks were cut into equilateral half-prisms, which were treated with HF or AB, then treated with an experimental silane or not and bonded to their counterparts with an experimental light-cure resin cement. After thermocycling, samples (n=30 per group) were tested for IFT using the notchless triangular prism test in a water bath at 36°C. Moreover, profilometry and contact angle measurement were performed on rectangular samples of each group. Finally, bonding interface was analysed by SEM. RESULTS: PICN-HF treated with silane showed the highest IFT significantly. Three-way ANOVA revealed the influence of silane, material class and surface pre-treatment (HF or AB) on IFT (p<0.05). When silane was used, IFT was correlated with Sdr, while surface wettability was increased. Silane application significantly increased IFT for PICN but not for DF, while PICN performed better with HF and DF with AB. SIGNIFICANCE: Silane increases IFT of composite cement with PICNs, but not with DF materials. Results suggest that silane increases the micromechanical bond by promoting resin cement spreading and penetration in surface roughness. This roughness is significantly higher for pre-treated PICNs than for DF due to their specific honeycomb microstructure when etched, which explains their better bonding properties.

Research Center/Unit :

d‐BRU - Dental Biomaterials Research Unit - ULiège

Disciplines :

Dentistry & oral medicine

Author, co-author :

Eldafrawy, Maher ; Université de Liège - ULiège > Doct. sc. dent. (paysage)

Greimers, Laura

Bekaert, Sandrine ; Centre Hospitalier Universitaire de Liège - CHU > > Service prothèse fixe et dentisterie restauratrice ; Centre Hospitalier Universitaire de Liège - CHU > Département de dentisterie > Service prothèse fixée

Gailly, Patrick; Université de Liège - ULiège

Lenaerts, Cedric; Université de Liège - ULiège

Nguyen, Jean-François

Sadoun, Michael

Mainjot, Amélie ; Université de Liège - ULiège > Département des sciences dentaires > Biomatériaux dentaires ; Université de Liège - ULiège > Dental biomaterials research unit (d-BRU) ; Université de Liège - ULiège > Département de sciences dentaires > Biomatériaux dentaires

Language :

English

Title :

Silane influence on bonding to CAD-CAM composites: An interfacial fracture toughness study.

Publication date :

06 June 2019

Journal title :

Dental Materials

ISSN :

0109-5641

eISSN :

1879-0097

Publisher :

Elsevier, Netherlands

Volume :

Issue :

Pages :

1279-1290

Peer reviewed :

Peer Reviewed verified by ORBi

Tags :

d-BRU Biomaterials Platform

Available on ORBi :

since 09 July 2019

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