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. 2017 Feb 1;9(2):e242-e248.
doi: 10.4317/jced.53216. eCollection 2017 Feb.

Evaluation of the effect of adding micro-hydroxyapatite and nano-hydroxyapatite on the microleakage of conventional and resin-modified Glass-ionomer Cl V restorations

Farahnaz Sharafeddin  1 , Negar Feizi  2
Affiliations

Evaluation of the effect of adding micro-hydroxyapatite and nano-hydroxyapatite on the microleakage of conventional and resin-modified Glass-ionomer Cl V restorations

Farahnaz Sharafeddin et al. J Clin Exp Dent. .

Abstract

Background: Pulpal reaction to restorative materials depends on marginal microleakage, which is a dynamic phenomenon that allows bacteria and fluids to traverse across the tooth-restoration interface. Glass-ionomer cement (GIC) exhibits low microleakage due to direct bonding to tooth structures. Hydroxyapatite (HAP) based on the similarity with tooth structure may decrease the microleakage. The aim of this in vitro study was to evaluate marginal microleakage of a mixture of conventional and resin-modified glass-ionomer (RMGI) with micro- and nano-HAP.

Material and methods: In this in vitro study, 30 non-carious extracted human third molar teeth were used. Standard Cl V cavities were prepared on the buccal and lingual surfaces. The cavities were restored in six experimental groups as follows: group 1, conventional glass-ionomer cement (CGIC); group 2, CGIC with micro-HAP; group 3, CGIC with nano-HAP; group 4, RMGI; group 5, RMGI with micro-HAP; group 6, RMGI with nano-HAP. The restorations were finished and polished. The teeth were coated with nail polish, sealed with sticky wax, thermocycled and placed in a solution of 2% basic fuchsine for 24 hours. The teeth were sectioned and microleakage was measured. Kruskal-Wallis, Man-Whitney and Wilcoxon tests were used for data analysis (P<0.05).

Results: The data analysis revealed significantly lower microleakage in groups 5 and 6 at both occlusal and gingival margins. Also in these two groups the gingival microleakage was significantly lower than occlusal margin (P=0.009 and P=0.001 respectively), but in groups 1(CGIC) and 3(CGIC+ nano-HAP) and 4(RMGI) the microleakage of occlusal margin were significantly lower than that of gingival margin (P=0.001, P=0.007 and P=0.001 respectively).

Conclusions: Mixing RMGI with nano-HAP and micro-HAP resulted in lower microleakage. Key words:Glass-ionomer, micro-hydroxyapatite, microleakage, nano-hydroxyapatite.

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Conflict of interest statement

Conflict of interest statement:The authors of this article certify that they have no proprietary, financial, or other personal interest of any nature or kind in any product, service, and/or company that is presented in this article.

Figures

Figure 1
Figure 1
a: 0 = no dye penetration; b: 1 = dye penetration between the restoration and the tooth up to one-third of the distance between the tooth surface and the axial wall; c: 2 = dye penetration extending beyond one-third of the distance up to two-thirds of the distance between the tooth surface and the axial wall; d: 3 = dye penetration extending up to two-thirds of the distance between the tooth surface and the axial wall; e: 4 = dye penetration reaching the axial wall; and f; 5 = dye penetration reaching the entire axial wall.
Figure 2
Figure 2
Occlusal and gingival microleakage in experimental groups (Mean rank).
See this image and copyright information in PMC

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