Clinical Evaluation of RTX Locator Attachments for Implant-supported Mandibular Complete Overdenture

Inclusion Criteria: * adequate bone quantity \[class III -V according to Cawood and Howell in the interforaminal area of the mandible to receive 2 implants (4×13 mm) * adequate restorative space \[12-15 mm from the mucosa of the mandibular ridge to the occlusal plane, Class I according to Ahuja and Cagna for RTX supported implant overdenture. Exclusion Criteria: * systemic diseases that contraindicate implant placement * bone metabolic diseases as diabetes mellitus * irradiation of the head and neck region * chemotherapy within the past 3 years * smoking habits.