Challenges associated with reentry maxillary sinus augmentation

Objective This study was a retrospective assessment of reentry sinus augmentation compared with sinus augmentation performed for the first time. Study design There were 38 subjects who required sinus augmentation. The study group (17 patients, 21 sinuses) included subjects following failure of a previous sinus augmentation procedure that required reentry augmentation. The control group (21 patients, 21 sinuses) included subjects in which sinus...