3 groups of immediately Loaded implant-supported overdenture patients will be evaluated (overdentures supported by two standard-sized implant, overdentures supported by 4 mini implant d: 3.2 mm ,overdentures supported by 4 mini implant d: 2.75 mm) regarding stability, masticatory efficiency, patient's satisfaction, oral health related quality of life, Peri-implant crestal alveolar bone loss.
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change in denture stability
Timeframe: T1: before implantation; T2: 1 month after loaded; T3: 3 month after loaded; T4: 6 month after loaded; T5:12 month after loaded
change in masticatory efficiency
Timeframe: T1: before implantation; T2: 1 month after loaded; T3: 3 month after loaded; T4: 6 month after loaded; T5:12 month after loaded
change in patient's satisfaction
Timeframe: T1: before implantation; T2: 1 month after loaded; T3: 3 month after loaded; T4: 6 month after loaded; T5:12 month after loaded
change in oral health related quality of life
Timeframe: T1: before implantation; T2: 1 month after loaded; T3: 3 month after loaded; T4: 6 month after loaded; T5:12 month after loaded
change in Peri-implant crestal alveolar bone loss
Timeframe: T1: on same day of loaded; T2: 3 month after loaded; T3: 6 month after loaded; T4:12 month after loaded