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Improvement of enamel bond strengths for conventional and resin-modified glass ionomers: acid-etching vs. conditioning

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Abstract

Objective

This study deals with the effect of phosphoric acid etching and conditioning on enamel micro-tensile bond strengths (μTBSs) of conventional and resin-modified glass ionomer cements (GICs/RMGICs).

Methods

Forty-eight bovine incisors were prepared into rectangular blocks. Highly-polished labial enamel surfaces were either acid-etched, conditioned with liquids of cements, or not further treated (control). Subsequently, two matching pre-treated enamel surfaces were cemented together with one of four cements [two GICs: Fuji I (GC), Ketac Cem Easymix (3M ESPE); two RMGICs: Fuji Plus (GC), RelyX Luting (3M ESPE)] in preparation for μTBS tests. Pre-treated enamel surfaces and cement-enamel interfaces were analyzed by scanning electron microscopy (SEM).

Results

Phosphoric acid etching significantly increased the enamel μTBS of GICs/RMGICs. Conditioning with the liquids of the cements produced significantly weaker or equivalent enamel μTBS compared to the control. Regardless of etching, RMGICs yielded stronger enamel μTBS than GICs. A visible hybrid layer was found at certain enamelcement interfaces of the etched enamels.

Conclusions

Phosphoric acid etching significantly increased the enamel μTBSs of GICs/RMGICs. Phosphoric acid etching should be recommended to etch the enamel margins before the cementation of the prostheses such as inlays and onlays, using GICs/RMGICs to improve the bond strengths. RMGICs provided stronger enamel bond strength than GICs and conditioning did not increase enamel bond strength.

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Authors and Affiliations

  1. Hospital of Stomatology Affiliated to Zhejiang University School of Medicine, Hangzhou, 310006, China

    Ling Zhang, Tian Tang, Zhen-liang Zhang, Bing Liang, Xiao-miao Wang & Bai-ping Fu

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  1. Ling Zhang
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  2. Tian Tang
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  3. Zhen-liang Zhang
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  4. Bing Liang
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  6. Bai-ping Fu
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Correspondence to Bai-ping Fu.

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Project supported by the National Natural Science Foundation of China (No. 20973152) and the Zhejiang Provincial Natural Science Foundation of China (No. Y2080045)

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Zhang, L., Tang, T., Zhang, Zl. et al. Improvement of enamel bond strengths for conventional and resin-modified glass ionomers: acid-etching vs. conditioning. J. Zhejiang Univ. Sci. B 14, 1013–1024 (2013). https://doi.org/10.1631/jzus.B1300034

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