3.1. Marginal Bone Level (MBL) Change
BONE LOSS
There was no significant difference in the mean marginal bone loss between the two posterior and two anterior implants in the four-MDI group at the 5-year follow-up examination (t = 1.88; In the three-MDI group (Wilks’ lambda = 0.517; F(2.32) = 15.4; The ANCOVA (dependent variable = marginal bone change at the 5-year follow-up) revealed that the model was not significant (F = 0.68, 