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Table 7 Survival rate and number of implants depending on the investigation interval (patient level in the mandible)

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

254

3

100–98.8

12 < , ≤ 24

251

0

98.8

24 < , ≤ 36

251

1

98.8–98.4

36 < , ≤ 48

250

0

98.4

48 < , ≤ 60

233

0

98.4

60 < , ≤ 72

219

0

98.4

72 < , ≤ 84

191

1

98.4–97.9

84 < , ≤ 96

171

0

97.9

96 < , ≤ 108

133

0

97.9

108 < , ≤ 120

110

0

97.9

120 < , ≤ 132

91

0

97.9

132 < , ≤ 144

81

1

97.9–96.7

144 < , ≤ 156

72

0

96.7

156 < , ≤ 168

45

0

96.7

168 < , ≤ 180

29

0

96.7

180 < , ≤ 192

12

0

96.7

192 < 

1

0

96.7