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(a) Marginal bone loss (MBL, mm) around endosseous implants inserted in maxilla or mandible in patients of different age categories. (b) Marginal bone loss (MBL, mm) around endosseous implants of different diameter (3.3, 3.8, 4.25, or 5 mm) inserted in maxilla or mandible in patients older than 60 years. *P < 0.05, **P < 0.01, and ***P < 0.0001.
