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for mandibular implant overdenture (MIOD) assisted by anterior bar versus cantilevered ball (CB) bar. Twenty completely-edentate patients received two inter-foraminal implants. The Patients were divided randomly and equally to ten patients received MIOD assisted with anterior bar, then after one year converted to CB bar for another one year. The rest of patients received MIOD assisted with CB bar then after one year replaced by anterior bar for another one year. MBF and ME were registered for each patient after three months of conventional denture insertion (T1), at insertion of MIOD (T2), after six months of MIOD insertion (T3) and after one year of MIOD insertion (T4). For MBF, there was a significant increase in the recorded MBF within each group between at all intervals (p <0.001). There was a significant difference between both groups at T2 and T3 (p = 0.01 and 0.02 respectively). For ME, There was a significant increase in the recorded ME within during wearing the MIOD with CB bar for all time intervals (p < 0.001). While at using anterior bar, there was a significant difference between T2, T3 and T4 only (p <0.001).There was a significant difference between both groups at T2, T3, and T4 (p <0.001). Within the limitations of the study, patients wearing MIOD assisted by CB bar attachment design revealed superior MBF and ME comparing to anterior bar after one year clinical service. [ABSTRACT FROM AUTHOR]