Surface Treatments for Repair of Feldspathic, Leucite - and Lithium Disilicate-Reinforced Glass Ceramics Using Composite Resin

Abstract

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.

Repair Bond Strength of a Resin Composite to Plasma-Treated or UV-Irradiated CAD/CAM Ceramic Surface

“…In doing so, it promotes micromechanical retention between the ceramic surface and the adhesive resin, thereby increasing the bond strength [7,24,25]. Comparatively, treatment with phosphoric acid produces minimal etching of the surface [26]. As a result, phosphoric acid etching is usually performed only to clean the adhered surface.…”

Bond strength of resin cements to leucite-reinforced ceramics: part 2 – after one-year aging in water

“…To further improve these properties, many technological advances have recently enabled the development of new materials with higher mechanical strength, such as those reinforced by leucite, lithium disilicate, infiltrated by glass, injected and machined [14].…”

“…They were blasted with aluminum oxide, conditioned by hydrofluoric acid followed by the application of a silane. The blasting with aluminum oxide is used to increase the surface roughness, as well as clean and activate the surface, according to several authors [5,8,14,15,17]. The hydrofluoric acid works by creating pores on the surface through preferential dissolution of the glassy phase of the ceramic matrix [6,11].…”

Farklı yüzey hazırlıklarının CAD/CAM hibrit seramiğin kompozit rezin ile tamirine etkisi

“…4,[8][9][10] Üretici firma, Vita Enamic'in kimyasal bileşeninin yüksek oranda ince yapılı feldspar seramik ağdan oluştuğunu ifade etmektedir.…”

“…Bu bağlantı kimyasal ve/veya mekanik olabilmektedir. 4 Yapılan yüzey hazırlıkları seramik restorasyonlar için alüminyum oksit partikülleri ile kumlama, hidroflorik asit ile pürüzlendirme, silan uygulamaları, tribokimyasal silika kaplaması, frez ile mekanik pürüzlendirme olarak sıralanabilir.…”