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Table 1 Patient characteristics of total group and of patients with two, three, or four implants

From: Implant-supported mandibular overdentures: a retrospective case series study in a daily dental practice

  Total group
n=295
2-implant group
n=124
3-implant group
n=86
4-implant group
n=85
Gender (men/women) 158/137 78/46 41/45 39/46
Mean age in years at implant placement (sd, min–max) 64 (10, 32–88) 62 (11, 32–88) 64 (9, 42–83) 67 (9, 46–86)
Mean edentulous period (years) of mandible before implant placement (sd, min–max) 21 (16, 1–60) 16 (15, 1–60) 21 (16, 1–56) 28 (14, 1–53)
Mean height of mandible in millimeters (sd, min–max) 16 (3.9, 10–25) 17 (3.7, 10–25) 16 (3.7, 10–25) 14 (3.2, 10–25)
Classification according to Cawood and Howell [18] in the symphysis region Class III, 17%
Class IV, 30%
Class V, 32%
Class VI, 17%
Class VII, 4%
Class III, 24%
Class IV, 36%
Class V, 24%
Class VI, 16%
Class VII, 0%
Class III, 12%
Class IV, 35%
Class V, 29%
Class VI, 17%
Class VII, 7%
Class III, 12%
Class IV, 18%
Class V, 46%
Class VI, 18%
Class VII, 6%