Evaluation the amount of bone height gained when using titanium mesh in closing the lateral window of the sinus compared to collagen membrane.Evaluation the quality of new bone gained when using of the titanium mesh to close the lateral window of the maxillary sinus as a new option for tenting compared to collagen membrane.

this study is aimed to review the bone height, quality and closure of lateral osteotomy used for maxillary sinus floor lifting comparing titanium mesh to collagen membrane.

Inclusion Criteria:

• no signs of sinus pathology non or light smokers less than 20 cigarettes per day no systemic disease that may affect normal healing no pscychiatric problems no history of neoplasms or radiation therapy to the head and neck no previous bone augmentation to implant site

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.