*5.1.3.2. Radiopacity*

Although alternative radiopacifiers have been proposed in bibliography [108, 109], barium sulfate (BaSO4) is still the gold standard for medical applications [110]. Incorporation of BaSO4 particles to polymer matrices enables surgeons to accurately place and to monitor any migration of the implant over time.

Singularly, barium sulfate submicron particles added to polylactide matrix enhance deforma‐ tion at rupture and confer high toughness to fragile polylactides [111]. Consequently, the addition of these submicron barium sulfate particles enables a radiopaque and tough poly‐ lactide composite.
