There is a strong correlation btw success rate of endodontic treatment and obturation level. Longer – worst!
This is true if we know that GP cone is extruded out of root. How about sealer extrusion? It’s difficult to say in retrospective study – this is guttapercha or for sure it’s sealer.
Good example is a Sari’s study in which he didn’t found any difference in long healing but 6 months.
So probably sealer extrusion is NOT a factor has an influence on healing