Fig. 3From: The All-on-four concept for fixed full-arch rehabilitation of the edentulous maxilla and mandible: a longitudinal study in Japanese patients with 3–17-year follow-up and analysis of risk factors for survival rateKaplan–Meier curves in the implant level. The log-rank test showed a significant difference between the maxilla and mandible (p = 0.0320)Back to article page