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. 2023 Mar 26;16(7):2635.
doi: 10.3390/ma16072635.

Comparison of the Micro-Shear Bond Strength of Resin Cements to CAD/CAM Glass Ceramics with Various Surface Treatments

Gaye Sağlam  1 , Seda Cengiz  1 , Ayşegül Köroğlu  1 , Onur Şahin  2 , Neslin Velioğlu  3
Affiliations

Comparison of the Micro-Shear Bond Strength of Resin Cements to CAD/CAM Glass Ceramics with Various Surface Treatments

Gaye Sağlam et al. Materials (Basel). .

Abstract

This study aimed to compare the effect of acid etching, sandblasting, or silica coating on the micro-shear bond strength of dual-cured resin cements to computer-aided design and computer-aided manufacturing (CAD/CAM) glass ceramic materials. Feldspathic, lithium disilicate, and zirconia-reinforced CAD/CAM ceramics were divided into four groups: control group (C), no surface treatment; hydrofluoric (HF) group, 5% HF acid-etched; sandblasting (SB) group, abraded with 50 µm aluminum oxide (Al2O3) particles; silica-coated (CJ) group, abraded with 30 µm silica-modified Al2O3 particles. Roughness values were obtained by using a profilometer. The cements were condensed on the surface-treated specimens and a micro-shear bond test was conducted. The ceramic material (p < 0.001) and surface treatment type (p < 0.001) significantly affected the micro-shear bond strength values. HF acid etching can be recommended for the surface pretreatment of feldspathic, lithium disilicate, and zirconia-reinforced CAD/CAM ceramics. Better bond strengths can be obtained with HF acid etching than with sandblasting and silica coating.

Keywords: CAD/CAM; glass ceramics; resin cement; shear bond strength; surface treatment.

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Conflict of interest statement

The authors declare no conflict of interest. The funders had no role in the design of the study; in the collection, analyses, or interpretation of data; in the writing of the manuscript; or in the decision to publish the results.

Figures

Figure 1
Figure 1
Mean and standard deviations of micro-shear bond strength values (MPa). C, control group; CJ, silica-coated group; HF, hydrofluoric acid etching group; SB, sandblasted group; V, Variolink; B, BisCem.
Figure 2
Figure 2
Stereomicroscopy photographs of the representative fracture patterns. Adhesive (a), cohesive (b), mix (c).
Figure 3
Figure 3
Fracture types of groups. VM, feldspathic; EC, lithium disilicate; VS, zirconia-reinforced lithium silicate; C, control group; CJ, silica-coated group; HF, hydrofluoric acid etching group; SB, sandblasted group; V, Variolink; B, BisCem.
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