09/02/2026
Our patient presents with Stage IV, Grade B periodontitis, generalized horizontal bone loss, recurrent caries, and a restoratively hopeless dentition. In patients with a robust hard- and soft-tissue phenotype, preservation of the existing anatomy should be prioritized because maintenance of the native tissue architecture better facilitates predictable implant placement and peri-implant tissue stability (Avila-Ortiz et al., 2020). CBCT revealed a maxillary antral pseudocyst characterized by a dome-shaped soft-tissue opacity arising from the sinus floor. Current evidence suggests that sinus augmentation and implant placement can be safely performed in appropriately selected patients with antral pseudocysts, whether the lesion is removed or preserved, with comparable implant outcomes (Fu et al., 2022). Because many pseudocysts are asymptomatic and may regress spontaneously, conservative observation is generally reasonable when there is no significant expansion, sinus obstruction, impaired ventilation, or relevant symptoms (Choi et al., 2003; Moon & Lee, 2024).
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