Assessment the need for sinus floor elevation when restoring atrophic posterior maxilla or it will be enough to use of short implant

Inclusion Criteria:

• Patients with partially edentulous in the posterior area of the maxilla, with a residual ridge that allowed insertion of ≤8 mm length implants.
• Both sexes.
• No intraoral soft and hard tissue pathology
• No systemic condition that contraindicate implant placement.

Exclusion Criteria:

• Sinus pathology.
• Heavy smokers more than 20 cigarettes per day.
• Patients with systemic disease that may affect normal healing.
• Psychiatric problems
• Disorders to implant are related to history of radiation therapy to the head and neck neoplasia, or bone augmentation to implant site
• Immunodeficiency pathology, bruxism, stress situation (socially or professionally), emotional instability, and unrealistic aesthetic demands.