“…18,21,56 The radiopacity of a resin-based material depends in part on selection of the polymer matrix, the chemical nature of the filler particles, and their size, density, and amount in the resin matrix. 14,15 A study by Pekkan et al showed that resin matrices in luting cements could have influenced the radiopacity. 45 In resin-based materials, barium, yttrium, ytterbium, zinc, aluminium, strontium, and zirconium are additives that increase radiopacity.…”