Maxillary sinus floor augmentation comparing removing versus retaining antral pseudocyst: A retrospective cohort study

Abstract

Objectives: To retrospectively compare multilevel volumetric changes in both hard and soft tissues between antral pseudocyst (AP) removal and retainment before maxillary sinus floor augmentation (MSFA) and immediate implant placement. Material and methods:Twenty-six patients with 38 implants placed from 2016 to 2021 were included and divided according to a cohort design as follows: 13 removing the cyst (RC group) and 13 "leaving alone" the cyst (LC group). 3D radiographic parameters (primary outcome), 2D parameters and clinical records (secondary outcome) involving both hard and soft tissues were evaluated for four periods (T1: immediate postoperative, T2: 6-month, T3: 12-month, and T4: 2-to 5-year follow-up). Possible confounding factors, including sinus anatomical features and implant distribution, were also analyzed to eliminate their disturbance. Results:The 3D volumetric change rate of bone grafts in the RC group (−9.32% ± 10.01%) from T2 to T3 was significantly lower than that in the LC group (−19.8% ± 10.59%) (p < .05). The change rate of apical bone height (ABH), endo-sinus bone gain (ESBG) and other 2D parameters were not significantly different between the two groups.5.3% implants in RC group and 9.1% implants in LC group failed during follow-ups. 0% postoperative complications were observed in RC group. The Schneiderian membrane of RC group was significantly thinner than that of LC group at two measuring points in sinus. Conclusion:The present study demonstrated that compared to AP retainment, AP removal before MSFA and immediate implant placement can obtain higher bone graft volumetric stability and favorable prognosis.

Maxillary Antral Pseudocyst Drift after Osteotome Sinus Floor Elevation with Simultaneous Implant Placement: A Case Report and Literature Review

“…We summarize the principal progress in recent research on this topic (Table 1). Fu et al [21] conducted a retrospective cohort study, dividing 26 patients into two groups (13 in the "removing the cyst group" and 13 in the "leaving the cyst alone" group). The results showed that antral pseudocyst removal before maxillary sinus floor augmentation and immediate implant placement after lateral sinus floor elevation could achieve higher bone graft volumetric stability.…”

Survival analysis of implants placed simultaneously with lateral sinus floor elevation in severely atrophic maxilla: A 3‐ to 12‐year retrospective cohort study

“…The scanning parameters were set at 12 mA, 110 kV, 3.6–4.8 s exposure time, 15 × 12 mm 2 field of view, and 0.3 mm voxel size. One trained investigator (Zhikang Wang) used the Green Lander® picture archiving and communication system to evaluate the imaging data 25 …”

“…One trained investigator (Zhikang Wang) used the Green Lander ® picture archiving and communication system to evaluate the imaging data. 25 The following preoperative sinus anatomical parameters were measured: (1) RBH: height of the alveolar bone at the position where the implant was planned to be placed, 26 (2) Schneiderian membrane condition: Schneiderian membrane condition was evaluated on CBCT sagittal sections and classified into "no thickening above 2 mm," "flat membrane thickening (>2mm)," "dome-like thickening," and "mixed flat and dome-like thickening," 26,27 (3) sinus width: the distance between the buccal sinus and palatal sinus walls at a 10-mm level from the residual alveolar crest, 19 (4) presence of septa: the presence of septa was identified on CBCT sagittal sections at the presumed implantation site, which was defined as "yes" or "no." 28…”

Radiographic feature changes in an antral pseudocyst that existed prior to sinus floor augmentation and dental implant placement, 15 years after initial detection - a case report

“…APs are a pathological condition that can affect MSA outcomes. The presence of APs can complicate surgical procedures by increasing the risk of membrane perforation and postoperative complications [ 9 ].…”