Immediately or delayed sinus augmentation after pseudocyst removal: A randomized trial

To compare clinical and histological outcomes of sinus augmentation performed immediately or 3 months after pseudocyst removal through a prospective randomized controlled study.In total, 33 sinus augmentation procedures were performed in 31 patients. Augmentation was performed either immediately after pseudocyst removal (one-stage intervention) or after 3 months (two-stage intervention). Six months postoperatively, bone specimens were harvested, and histomorphometric analysis was performed as primary outcome. Data were recorded and evaluated for implant survival rates, marginal bone resorption, complication rate, and patient-centered outcomes (visual analogue scale [VAS]).There were no baseline differences between groups or dropouts. Twelve biopsies obtained for histomorphometric analysis showed that delayed sinus augmentation, when compared to immediated led to a 1.1% increased mineralized bone ratio (95% confidence interval [CI]: -15.9 to 13.7). Graft leakage and acute sinusitis occurred in one patient in the one-stage group, none in the two-stage group. No pseudocyst recurrence was observed until the end of 1-year follow-up. Median VAS scores for overall acceptance were significantly increase of 1.4 (95% CI: 0.3-2.56) in immediate group. The degree of post-operative discomfort was not significantly different, although an increase of VAS (0.52, 95% CI: -0.32 to 1.37) was observed in delay group.Both procedures of sinus augmentation immediately and 3 months after pseudocyst removal could obtain comparable histological outcomes and had low complication rates. Patients who underwent the one-stage procedure had a short treatment course and high satisfaction rates, but this procedure is technically challenging to perform. This clinical trial was not registered prior to participant recruitment and randomization. The clinical trial registration number is ChiCTR2200063121. The hyperlink is as follows: https://www.chictr.org.cn/showproj.html?proj=172755.