Amal Mohamed Basyouni *, Ali Mohamed El-sheikh** And Nahed Ahmed Kashief**,

ABSTRACT
The Aim Of This Study Was To Evaluate The Implant Supported Fixed- Detachable Mandibular Unilateral Distal Extension Bases With Two Different Cantilever Lengths Clinically And Radiographically.

Materials and Methods: 10 Partially Edentulous Patients With Mandibular Class II Kennedy Classification With Their Age Ranged From 25-55 Years And Divided In Two Groups. For Group I Had Received Two Implants At The Second Premolar And At The First Molar Regions. Three Unit Fixed Detachable Screw Retained Partial Denture With Distal Cantilever 7 Mm Was Fabricated. For Group II Had Received Two Implants At The Second Premolar And At The First Molar Regions. Three Unit Fixed Detachable Screw Retained Partial Denture With Distal Cantilever 10 Mm Was Fabricated. The Dental Implants Were Placed Using Conventional Delayed Loading Technique. Patients Were Recalled After 3, 6 And 12 Months As Regards To The Success And Survival Rate, Gingival Bleeding Index(GBI), Probing Pocket Depth(PPI) And Calculus Index(CI) And Radiographic Evaluation Of Marginal Bone Level (MBL) Using (Digora System).

Results: All Fixtures Were Successfully Osseointegrated By The End Of The Study. The Overall Cumulative Survival Rate Was 100%.Implant Level Technical Success Rate Was90% Group I And 80%.Group II. There Was Gradual Increase In The Clinical Parameters((GPI), (PPD) And (CI) And(MBL) From Baseline To The End Of The Evaluation Period. In Comparing The Mean Differences And Standard Deviations Between Both Groups There Was Non-significant Differences Throughout The Whole Evaluation Periods Except For The PPD Of The Implant At The Second Premolar And First Molar Regions At 12 Months Of Evaluation And CI Of The Implant At The First Molar Region At The 6 Months Of Evaluation Period.The Mean MBL For The Distal Surface Of The Implant At The Region Of The First Molar In Group II Was Non Significantly Higher Compared To The Same Implant In The Other Group At 12 Months Of Evaluation Period.

Conclusions: It Was Found That The Concept Of Cantilevered Implant Supported Fixed-detachable Screw Retained Prosthesis Was An Ideal Treatment To The Problem Of Class II Mandibular Kennedy?s Classification And Keeping The Size Of The Cantilever To The Mesiodistally Dimension Of 7 Mm Was Considered Satisfactory.