Smart Box With OT Equator Attachment in Retaining Implant-assisted Overdenture for the Atrophic Maxilla.

Inclusion Criteria

• •Male patients with comparable age (30- 65 years).
• •All patients should have retruded, posteriorly atrophic completely edentulous maxilla with sinus pneumatization leaving less than 7mm bone height posteriorly and a sufficient amount of bone in the inter bicuspids region.
• •Opposing mandibular dentate arch including bilateral posterior teeth.
• •All patients should have an adequate zone of keratinized mucosa.
• •All patients should be free from any intra-oral or systemic diseases that would otherwise affect the osseointegration of dental implants.
• •All patients should be well motivated, cooperative, and with adequate manual dexterity necessary to place and remove removable implant prosthesis to provide adequate oral hygiene around the endosseous implants.