to compare locator attachment to ball attachment in retaining mandibular single implant overdenture in terms of patient satisfaction and retention

Inclusion Criteria:

1. Completely edentulous patient
2. Patients having enough bone for an implant length of at least 10 mm
3. Sufficient inter-arch space to accommodate the denture & the attachment
4. No apparent Skeletal mal-relation
5. No intraoral soft and hard tissue pathology
6. No systemic condition that contraindicate implant placement

Exclusion Criteria:

1. Drug or alcohol abuse
2. Smokers
3. A health condition precluding surgery,
4. Logistic or physical reasons that could affect follow-up,
5. Psychiatric problems
6. Medically compromised patients & those with neuromascular disorders
7. Disorders to the implant area related to a history of radiation therapy to the head and neck, neoplasia, or bone augmentation to the implant site.

outcome assessor of 1ry outcome, statistician