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Table 6 Survival rate and number of implants depending on the investigation interval (patient 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 patients

Failed patients

Survival rate intervals (%)

0 < , ≤ 12

307

8

100–97.4

12 < , ≤ 24

299

1

97.4–97.1

24 < , ≤ 36

298

1

97.1–96.7

36 < , ≤ 48

297

0

96.7

48 < , ≤ 60

282

0

96.7

60 < , ≤ 72

257

0

96.7

72 < , ≤ 84

223

0

96.7

84 < , ≤ 96

189

0

96.7

96 < , ≤ 108

155

0

96.7

108 < , ≤ 120

124

0

96.7

120 < , ≤ 132

100

0

96.7

132 < , ≤ 144

90

0

96.7

144 < , ≤ 156

78

0

96.7

156 < , ≤ 168

58

0

96.7

168 < , ≤ 180

42

1

96.7–94.4

180 < , ≤ 192

16

0

94.4

192 < 

5

0

94.4