Bonding to silicate ceramics: Conventional technique compared with a simplified technique

Abstract

BackgroundSilicate ceramic bonding is carried out by acid-etching with hydrofluoric acid (HF) followed by an application of silane. By replacing HF with ammonium polyfluoride, contained in the same flask as the silane, the number of steps in this clinical procedure, can be reduced, while maintaining bond strength values, and reducing toxicity. A shear bond test was performed to compare the conventional and the simplified surface treatment techniques.Material and Methods Twenty ceramic samples were fabricated from IPS emax CAD® ceramic (Ivoclar Vivadent) and divided into two groups (G1 and G2) (n=10). The conventional technique was applied to G1 samples, and the simplified technique to G2 samples. A resin cement cylinder was bonded to each sample. Afterwards, samples underwent shear bond strength testing in a universal test machine.Results G1 obtained 26.53±6.33 MPa and G2 23.52±8.41 MPa, without statistically significant differences between the two groups.Conclusions Monobond Etch&Prime appears to obtain equivalent results in terms of bond strength while simplifying the technique. Further investigation is required to corroborate these preliminary findings. Key words:Shear bond strength, surface treatment, bonding to ceramic, hydrofluoric acid, ammonium polyfluoride.

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“…We failed to reject the null hypothesis. These findings are in agreement with previous studies that found that the use of MEP for surface pre-treatment of glass ceramic blocks provides adequate bond strength that is equivalent to the conventional technique [13][14][15]. On the contrary, other studies reported that shear bond strength of resin cement to CAD/CAM glass ceramics when treated with MEP is significantly lower when compared to pre-treatment with hydrofluoric acid.…”

“…This new Self-etching primer (Monobond etch and prime, Ivoclar Vivadent, Schaan, Liechtenstein) simplifies the bonding procedure by decreasing the number of steps as well as saving chairside time. In vitro studies showed that Monobond etch and prime had comparable bond strength to the conventional bonding method [13,14]. In a short clinical study, the use of MEP offered a simplified alternative approach with good clinical results [13].…”

Effect of Two Different Surface Treatments on Micro-Shear Bond Strength of Cad/Cam and Heat Pressed Glass Ceramics

“…Therefore, the effective bonding may be attributed to the chemical affinity between silica in lithium disilicate and ammonium trifluoride in Monobond. (45,64) These finding were supported by many researchers, (65,66) who recorded morphological observations of silica glass matrix in lithium disilicate . The displaced glass matrix due to the polyfluoride component of Monobond, becomes incorporated into the adhesive bond with the resin cement.…”

“…(41,42) Universal adhesives represent the latest generation of dental adhesives that failed to prove their manufacturers' claims that they can be used as bondng agents on ceramic surfaces after HF surface treatment. (43)(44)(45) Recently, a novel single bottle selfetching ceramic primer, (Monobond® etch & prime), (Ivoclar Vivadent; Schaan, Liechtenstein), was introduced. It has the advantage of easier handling, less technique sensitivity and less time consumption (Single step).…”

“…Ammonium polyfluoride causes the production of a rough etching pattern, while the thin uniform layer of silane promotes the chemical bond to the glass ceramic. (45) It is claimed that the effect of Monobond Etch & Prime is comparable to those of HF and silane treatment. (46)(47)(48) However, very few in-vitro or in-vivo studies have been reported with limited data.…”