Objectives: To evaluate the impact of implants number and attachments type on the peri-implant stresses and retention of maxillary palateless implant-supported overdenture. Materials and Methods: Four edentulous maxillary educational acrylic resin models were used. According to the implants number and type of attachment used. four groups were compared: Group I. https://fitnessgravesyardes.shop/product-category/display-cap/