The first obturator with a crosslinked gutta-percha core superior 3D fills ease of retreatment post space simplified Crosslinking is a well-established scientific process that connects the polymer chains and transforms the gutta-percha to make it stronger, while keeping its best features. It gives GuttaCore its unique inner strength and means it can deliver a consistent fill of warm gutta-percha right down to the apex and, because the strong core is made of gutta-percha, it’s easier to re-treat.