Effect of Simplified Bonding on Shear Bond Strength between Ceramic Brackets and Dental Zirconia

Ga-Youn Ju,Soram Oh,Hyun-Seung Lee,Shin Hye Chung,Bum-Soon Lim

doi:10.3390/ma12101640

Ga-Youn Ju, Soram Oh + Show 3 more

Open Access

https://doi.org/10.3390/ma12101640

Copy DOI

Abstract

The aim of this study was to evaluate the long term stability of shear bond strength (SBS) when 10-methacryloyloxydecyl dihydrogen phosphate (10-MDP) containing universal adhesive was used in the ceramic bracket bonding on dental zirconia. Twenty human maxillary incisors were collected. The ceramic bracket was bonded on the buccal enamel surface after the acid-etching and orthodontic primer application (Group CON). Sixty zirconia specimens were sintered, sandblasted and divided into three experimental groups; group CP—ceramic primer followed by an orthodontic primer; group U—universal adhesive; group CU—ceramic primer followed by a universal adhesive. For each specimen, the bracket was bonded onto the treated surface with composite resin (Transbond XT, 3M ESPE). The SBS tested before (CON0, CP0, U0, CU0) and after the artificial aging (CON1, CP1, U1, CU1). The data were statistically analyzed with the Kruskal–Wallis test at a significance level of 0.05. The mean SBS of CON0, CP0, U0 and CU0 were within the clinically acceptable range without significant differences. After the aging process, SBS decreased in all groups. Among the aged groups, CP1 showed the highest SBS. Based on the results, when bonding ceramic brackets to a dental zirconia surface, we can conclude that ceramic primer used with an orthodontic primer, rather than using a universal adhesive, is recommended.

Highlights

Together with the development of CAD/CAM devices, the use of zirconia in dental restorations are getting more and more popularity
The most common type of zirconia used in dentistry is yttrium-stabilized tetragonal zirconia polycrystal (Y-TZP), which remains in the tetragonal phase at room temperature with the addition of 2–3 mol%
10-methacryloyloxydecyl dihydrogen phosphate (10-MDP)-containing universal adhesive was used in the ceramic bracket bonding on dental zirconia

Summary

Introduction

Together with the development of CAD/CAM devices, the use of zirconia in dental restorations are getting more and more popularity. The dental zirconia offers excellent mechanical strength and provides optimal aesthetics compared to porcelain fused to metal restorations [1,2]. The most common type of zirconia used in dentistry is yttrium-stabilized tetragonal zirconia polycrystal (Y-TZP), which remains in the tetragonal phase at room temperature with the addition of 2–3 mol%. Crack propagation of Y-TZP is blocked by the transition from the tetragonal to the monoclinic phase [6,7,8]. In restorations in aesthetic regions, translucent porcelain is veneered onto the zirconia-framework to provide a natural appearance. Chipping, crack and delamination of the veneering porcelain has been indicated as a problem in such restorations. The chipping or crack of the porcelain is attributed to the poor wetting of the veneering, the firing shrinkage of the porcelain

Objectives

Methods

Results

Discussion

Conclusion