Ramaglia L, et al. - In this 5-year longitudinal cohort study, investigators assessed the impact of an anatomical crown to implant ratio (CIR) on the peri-implant marginal bone level (MBL) in single implants among 78 implants inserted in 34 mandibles and 44 maxillae. They noted 35 implants <10 mm, 43 implants ≥ 10 mm long. They also found 28 implants with a CIR ≤1 and 50 with a CIR >1. They observed no drop-outs or implant loss. They noticed no correlation between higher CIR values and increased peri-implant bone loss. They suggested <10 mm long implant insertion, a safe approach for reduced bone heights.