From: 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 rate
Number of implant placed
Number of implant failure
Survival rate (%)
p value
Maxilla
Straight
710
10
98.6
0.57
Tilted
614
12
98.0
Mandible
532
2
99.6
0.41
508
5
99.0
Total
1242
0.22
1122
17
98.5