Abstract
SYNTHESIS AND EVALUATION OF PROPERTIES OF AN EXPERIMENTAL NANO-SIZED HYDROXYAPATITE MODIFIED GLASS IONOMER LUTING AGENT.

Dr. Nidhi R. Kantharia*, Dr. Mohit G. Kheur, Dr. Supriya M. Kheur, Sonali Naik and Sanjay Apte

ABSTRACT

Objective: This paper describes the development and evaluation of an experimental luting agent formed by incorporating nanosized hydroxyapatite particles into glass ionomer luting cement and compares its properties to commonly used commercially available luting agents. Method: The nanosized hydroxyapatite was synthesized using co-precipitation technique and the resulting precipitate was characterized using X-Ray diffraction analysis, field emission scanning electron microscopy and transmission electron microscopy. The hydroxyapatite particles were incorporated into the glass powder(GC FUJI I, Japan) and the luting agent was manipulated in a liquid to powder ratio of 3:1 in proportion of 6% by weight. The flexural strength and shear bond strength to the tooth dentine were analyzed and compared with other commercially available luting agents which included Glass ionomer luting agent( GC FUJI I), Resin modified Glass ionomer luting agent (RelyX™ luting plus) and adhesive resin cement (RelyX™ U200). The fractured interface of the cement to the tooth dentine was evaluated under scanning electron microscope. Results: The results from this study demonstrated that the addition of 6 percent mass of HA of particle size in the range of 80-150 nm enhanced the flexural strength and shear bond strength of conventional glass ionomer luting agent when manipulated at a higher liquid to powder ratio of 3:1. Significance: Higher flexural and shear bond strengths of the experimental luting agent on comparison with those of the commercially available glass ionomer luting agent, confirms the beneficial role of HA in glass ionomer matrix and expands the scope of applications of glass ionomers.

Keywords: Nano sized Hydroxyapatite, Glass Ionomer, Luting agent, Bond strength.


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