J Korean Acad Prosthodont.  2016 Oct;54(4):354-363. 10.4047/jkap.2016.54.4.354.

Influence of nano-structured alumina coating treatment on shear bond strength between zirconia ceramic and resin cement

Affiliations
  • 1Department of Prosthodontics, School of Dentistry and Institute of Oral Bio-Science, Chonbuk National University, Jeonju, Republic of Korea. jmseo@jbnu.ac.kr
  • 2Department of Dentistry, School of Medicine, Eulji University, Daejeon, Republic of Korea.

Abstract

PURPOSE
The aim of this study was to investigate whether the application of nano-structured alumina coating to the surface of Y-TZP could enhance the bond strength with resin cement.
MATERIALS AND METHODS
A total of 80 zirconia plates were prepared and divided into four groups. : 1) airborne particle abrasion treatment (A) : 2) Rocatec treatment after airborne particle abrasion (R) : 3) nano-structured alumina coating treatment after polishing (PC) and 4) nano-structured alumina coating after airborne particle abrasion (AC). Alumina coating was formed by the hydrolysis of aluminium nitride (AlN) powder and heat treatment at 900℃. Coating patterns were observed with FE-SEM. Resin block was bonded to treated zirconia ceramics using resin cement. The shear bond strengths were measured before and after thermocycling.
RESULTS
The FE-SEM images show a dense and uniform nano-structured alumina coating structure, which enhances shear bond strength by increasing micro mechanical interlocking to resin cement. PC and AC groups showed higher shear bond strengths than A and R groups before and after thermocycling. A and R groups displayed significant drops in shear bond strength after thermocycling. However, PC and AC groups did not show any meaningful decreases in shear bond strength after thermocycling.
CONCLUSION
Treatment of Y-TZP ceramics with nano-structured alumina coating could significantly increase their shear bond strength.

Keyword

Zirconia; Shear bond strength; Alumina coating; Thermocycling; Resin cement
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