Evaluation of Patient Satisfaction and Biting Force of New Design of Extracoronal Attachment (O T Cap Unilateral Attachment) Versus Conventional Partial Denture for Treatment of Unilateral Mandibular Distal Extension Area

Inclusion Criteria: * patients with unilateral mandibular distal extension area * Normal crown/root ratio of last premolar * co-operative patients Exclusion Criteria: * completely edentulous patient * few remaining teeth * patients exposed to radiotherapy and chemotherapy * patients with maxillary or mandibular defect