To relate radiologic size of preoperative periapical lesion, length of apical resection, and length of retrofill to middle and long term success of apicoectomy.
N=384 roots, 333 teeth, 235 patients.
-patients subjected to ultrasound instrumentation and retrofill with amalgam.
-periapical lesion sizes, amount of apical resection, and amount of retrofill measured via radiographs pre and postop.
-minimum follow up of 12 months.
-success of 73.9% after 1 yr.
-mean periapical area preop was 37mm^2 (diameter minimum 5-7.4mm maximum).
-mean apical resection 6.48mm^2.
-mean area of retrofill 3.05mm^2.
-positive correlation noted between dimensions of lesion and apical resection with treatment failure.
Prognosis of periapical surgery may improve with smaller preoperative periapical lesion size and smaller amounts of apical resection.