Abstract
In this experimental work, injection molding of alumina using a binder system based on high-density polyethylene and paraffin wax was performed to produce dental brackets. The use of a microinjection molding machine, permitting a careful control of the volume injected into the microcavity, allowed to produce dental brackets with complex shape and high aspect ratio. The organic component was removed by a combination of solvent and thermal debinding. After sintering at 1600°C, the final parts retained the green-part shape, with high surface finish. The density achieved (99.8%) was higher than that for similar parts obtained by uniaxial compaction.
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