A. Aluminium oxide
B. Ferric chloride
C. Boron oxide
D. Calcium sulphate
The correct answer is A. Aluminium Oxide.
Filler composition in composites are often modified with other ions to produce desirable changes in properties.
Barium, zinc, boron, zirconium, yttrium ions have been used to produce radiopacity in the filler particles.
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