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Table 5 Patient and treatment characteristics and survival

From: Survival of conventional dental implants in the edentulous atrophic maxilla in combination with zygomatic implants: a 20-year retrospective study

Variable Category Number of patients Relative frequency of patients (%) Number of anterior implants Relative frequency of anterior implants (%) 1-year survival (%) 2-year survival (%) 5-year survival (%) 10-year survival (%) 15-year survival (%) 20-year survival (%)
Age, baseline ≤ 60 44 61.1 144 61.0 94.4 93.6 93.6 89.1 74.0 59.9
> 60 28 38.9 92 39.0 96.7 96.7 93.2 93.6 93.6 84.8
Sex Female 35 48.6 117 49.6 96.5 96.5 93.5 90.3 88.9 74.7
Male 37 51.4 119 50.4 94.1 93.2 93.2 90.6 73.9 63.3
Smoking No 59 81.9 196 83.1 98.0 98.0 94.9 91.7 88.7 64.6
Yes 13 18.1 40 16.9 87.5 87.5 87.5 87.5 87.5 NA
Bruxism No 66 91.7 217 91.9 97.2 96.7 95.2 92.0 82.0 70.4
Yes 6 8.3 19 8.1 73.7 73.7 73.7 73.7 73.7 NA
Indication First treatment 61 84.7 203 86.4 95.6 95.0 95.0 93.9 84.3 70.0
Retreatment 11 15.3 33 14.0 93.5 93.5 83.9 68.6 NA NA
Mandible Teeth 43 59.7 143 60.6 93.6 92.8 90.4 85.3 76.9 58.8
Prosthesis 29 40.3 93 39.4 97.8 97.8 97.8 97.8 87.6 81.7
Surgeon experience < 5 years 22 30.6 84 35.6 92.9 92.9 92.9 91.6 78.6 65.3
5–10 years 19 26.4 76 32.2 100.0 100.0 95.5 92.4 89.3 89.3
≥ 10 years 31 43.0 76 32.2 93.4 92.1 92.1 86.9 83.7 NA
Number of anterior implants 2 (Z2A2) 21 29.2 42 17.8 100.0 97.5 97.5 94.9 NA NA
3 (Z2A3) 10 13.9 30 12.7 90.0 90.0 90.0 90.0 84.7 84.7
4 (Z2A4) 41 56.9 164 69.5 95.0 95.0 93.0 89.6 79.8 64.7
Type of prosthesis Overdenture 44 61.1 133 56.4 93.2 92.4 90.0 86.5 82.1 63.8
Fixed bridge 28 38.9 103 43.6 98.0 98.0 98.0 95.7 82.2 82.2
  1. NA not applicable