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Table 4 Survival rate and number of implants depending on the investigation interval (implant level in the maxilla)

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

Investigation interval (months)

Number of implants

Failed implants

Survival rate intervals (%)

0 < , ≤ 12

1324

15

100–98.9

12 < , ≤ 24

1309

4

98.9–98.6

24 < , ≤ 36

1305

1

98.6–98.5

36 < , ≤ 48

1304

0

98.5

48 < , ≤ 60

1222

0

98.5

60 < , ≤ 72

1116

0

98.5

72 < , ≤ 84

978

0

98.5

84 < , ≤ 96

835

0

98.5

96 < , ≤ 108

693

0

98.5

108 < , ≤ 120

552

0

98.5

120 < , ≤ 132

449

0

98.5

132 < , ≤ 144

403

0

98.5

144 < , ≤ 156

351

0

98.5

156 < , ≤ 168

253

0

98.5

168 < , ≤ 180

180

2

98.5–97.4

180 < , ≤ 192

68

0

97.4

192 < 

8

0

97.4