Evaluation of the shear bond strength of zirconia to a self-adhesive resin cement after different surface treatment.

Türker Akar,Kürşat Er,Hakan Er,Burak Yılmaz,Özlem Üstün,Alper Kuştarcı,Alper Kapdan,Ömer Kırmalı,Ayşe Dündar

doi:10.17219/dmp/135652

Abstract

The aim of this study was to evaluate the SBS of pre-sintered and sintered zirconia to a selfadhesive resin cement after various treatment (air abrasion and the Nd:YAG laser irradiation at varying power levels -1 W, 2 W and 3 W). Ninety-nine zirconia specimens were prepared and divided into 3 groups: control (with no surface treatment); and pre-sintered and sintered groups with surface treatment. Surface treatment was applied before sintering in the pre-sintered group and after sintering in the sintered group. After following all protocols, a resin cement was layered on the zirconia surface. Shear bond strength was measured using a universal testing machine. The results were subjected to the statistical analysis. The surface topography and phase transformation of zirconia were evaluated using the atomic force microscopy (AFM), scanning electron microscopy (SEM) and X-ray diffraction (XRD) analyses after surface treatment. The laser irradiation (3 W, 1 W and 2 W) of the pre-sintered zirconia surface resulted in the highest SBS values (p < 0.001), while the lowest SBS values were obtained with airborne particle abrasion of the pre-sintered and sintered zirconia surfaces. Laser irradiation increased the SBS of pre-sintered zirconia to a resin cement. Surface treatment with air abrasion had a lesser effect on the SBS values.

Highlights

Zirconia, especially an yttrium-stabilized tetragonal zirconia polycrystalline (Y-TZP) ceramic, is a durable and commonly used dental material that was introduced for single crowns,[1] frameworks for fixed partial dentures[1,2] and implant abutments[3] with the development of the computer-aided design/computer-aided manufacturing (CAD-CAM) technology
Results.The laser irradiation (3W, 1W and 2W) of the pre-sintered zirconia surface resulted in the highest shear bond strength (SBS) values (p < 0.001), while the lowest SBS values were obtained with airborne particle abrasion of the pre-sintered and sintered zirconia surfaces
The SBS values obtained with laser irradiation at power levels of 1 W, 2 W and 3 W on the pre-sintered zirconia surface were significantly higher as compared to the untreated surface and the sintered subgroups

Summary

Introduction

Especially an yttrium-stabilized tetragonal zirconia polycrystalline (Y-TZP) ceramic, is a durable and commonly used dental material that was introduced for single crowns,[1] frameworks for fixed partial dentures[1,2] and implant abutments[3] with the development of the computer-aided design/computer-aided manufacturing (CAD-CAM) technology It can be used both in the anterior and posterior regions due to its favorable mechanical properties (high fracture toughness (7–10 MPa) and high flexural strength (700–1,200 MPa)) and color.[1,2,3] Zirconia can be used in a monolithic form or can be veneered using feldspathic porcelain. When stimulated, it responds through a phase transformation mechanism, changing from its tetragonal (t) to monoclinic (m) phase, which results in superficial compressive stress with a grain volume increase of 3–5%. No study has yet comprehensively evaluated the influence of different power levels of the neodymium-doped yttrium-aluminum-garnet (Nd:YAG) laser irradiation on the shear bond strength (SBS) of zirconia to a self-adhesive resin cement

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