Current scientific growths for implant over-denture attachments. We focused on the following topics: attachment systems, retention of various attachments, stress distribution with different attachments, the design and fabrication of attachments, digital techniques in over denture attachments, and the effects of attachments in two-implant health. We found that plastic resin is commonly used for ball and bar attachments, whereas nylon resin is commonly used in locator attachments. The locator system offers a valuable attachment option for implant-retained over denture. Attachment retention reduces while lateral force increases with implant inclination in over denture. The higher the retention of an over-denture attachment, the higher the transferred stresses. Additionally, clip loading produces more stress in implants and precision elements than bar-retained dentures.