Evaluation of PEEK versus Titanium Bar Attachments with Implant Assisted Mandibular Complete Overdenture fabricated by CAD/CAM Technology measuring retention of the overdenture and implant evaluation for 6 months and one year

Inclusion Criteria:

• • Completely edentulous patients free from systemic diseases that may affect soft or hard tissue healing.

  • Patient's age ranges from 40 to 60 years old.
  • The bone quality and quantity of the mandibular alveolar ridge must fulfill the criteria for implant placement.
  • They have normal class Ӏ maxilla-mandibular relationship and sufficient inter-arch space with at least 25mm for bar attachment.
  • They have good oral hygiene.

Exclusion Criteria:

• Systemic disorders that may influence soft or hard tissue healing as oral diseases.
• Patients with history of radiation therapy in the head and neck region.
• Patients with neurological or psychological problems that may impair good oral hygiene.