Effects of Mixing Technique on Glass-Ionomer Cements
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Date
2016-05
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The Ohio State University
Abstract
Objective. To determine the effect of mixing technique on the mechanical properties of GICs.
Methods. Two mixing techniques were evaluated; method 1 combined the glass and polymer physically by mixing for 90 seconds in a mortar and pestle then adding water, method 2 dissolved the polymer into the water, creating a gel, and then added the glass. Method 2 is the current industry standard. Flexural strength, compression strength, and fracture toughness were determined using a Model 4204 Instron Universal Testing Device. Water sorption was also evaluated. Conditioning time was also adjusted for each batch of samples using intervals of 1, 7, and 26 days.
Results. Of the eight comparisons made, one result (flexural strength, 26 day) produced a statistically significant difference with method 1 being stronger than method 2 (the industry standard).
Significance. The lack of difference in the strengths is an important result since method 1 and method 2 differ so greatly in mixing technique. Method 1 also provides a potentially longer shelf life than method 2 since the polymer is not degraded over time in water.
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Keywords
Glass-Ionomer, Mixing Technique