Effects of surface treatments on shear bond strengths between a resin cement and an alumina core

Abstract

The use of Panavia 21 resin cement and a silane coupling agent can achieve a successful bond between either sandblasted or 5% HF acid-etched In-Ceram core material.

The Effect of Surface Treatments on the Micro-shear Bond Strength of a Resin Luting Agent and Four All-ceramic Systems

“…This would have been true for specimens that received airborne particle abrasion in relation to hydrofluoric acid etching, since the irregularities obtained by the acid are deeper, thus better protecting the resin-luting agent from the degradation process. 21 Even though some researchers 15,18,20 have shown that In Ceram Alumina is not altered by hydrofluoric acid and that this treatment is not enough to promote any difference in bond strength, the current results showed that the micro-shear bond strength was increased after this treatment. The shallow irregularities observed in the control group were also found after hydrofluoric acid etching.…”

“…The morphological pattern obtained with 50-µm aluminum oxide particles was more effective for micromechanical bonding compared to airborne particle abrasion with 100-µm aluminum oxide particles, according to the findings that are consistent with other studies. [15][16][17][18][19][20][21] Using 9.5% hydrofluoric acid etching changed the surface topography of IPS Empress 2 and Cergogold ceramics, creating a topography similar to a honeycomb for Cergogold ( Figure 4C) and elongated the crystals with shallow irregularities for IPS Empress 2 ( Figure 3C). The chemical-etching process can be explained by the preferential reaction of hydrofluoric acid with the silica phase of the feldspathic ceramic to form hexafluorosilicates, which are removed by rinsing with water.…”

“…However, previous studies have shown that all-ceramic restorations, based on densely sintered high-purity alumina or zirconia and glass infiltrated aluminum oxide, not only resist forming micro-retentive surfaces after hydrofluoric acid etching, but also silanating the surfaces does not promote chemical interaction with the resin material. [17][18][19][20][21][22][23]25,28 The current study evaluated the micro-shear bond strength of different surface treatments between strengthened ceramics and a resin-luting agent. Additionally, the conditioned ceramic surfaces were evaluated using scanning electron microscopy (SEM).…”

Characterizing ceramics and the interfacial adhesion to resin: II- the relationship of surface treatment, bond strength, interfacial toughness and fractography

“…Ceramics with high crystalline content (aluminum and/ or zirconium oxides), also called acid-resistant ceramics, have demonstrated better clinical performance than feldspar-, leucite-, and lithium disilicate-based ceramics, known as acidsensitive ceramics. However, an increase in mechanical strength, by increasing the crystalline content and decreasing the glass content, results in an acid-resistant ceramic whereby any type of acid treatment produces insufficient surface changes for adequate bonding to resin 24,25,30,31,35,37,51,54,73 . For these acid-resistant ceramics, a silica coating process (silicatization) has been suggested to maximize the bond to resin 30,42,51,54,70,75 .…”

“…However, an increase in mechanical strength, by increasing the crystalline content and decreasing the glass content, results in an acid-resistant ceramic whereby any type of acid treatment produces insufficient surface changes for adequate bonding to resin 24,25,30,31,35,37,51,54,73 . For these acid-resistant ceramics, a silica coating process (silicatization) has been suggested to maximize the bond to resin 30,42,51,54,70,75 . The silica coating systems (Rocatec and Cojet, 3M-ESPE) create a silica layer on the ceramic surface because of the high-speed surface impact of the alumina particles modified by silica.…”