Table 2 Surface area of the different sized expanders.

From: Anthropometric assessment of microtia patients’ normal ears and discussion on expander selection in auricular reconstruction surgery

Volume injected (ml)

Full surface area (mm2)

Half surface area (mm2)

50

8227.893713

4113.947

60

8534.727777

4267.364

70

9108.005594

4554.003

80

10,616.30793

5308.154

90

10,813.37335

5406.687

100

11,158.08895

5579.044

110

11,384.74174

5692.371

120

12,752.24147

6376.121

  1. The 50-, 60-, and 70-ml volumes were measured using a 50-ml specification expander. The remaining volumes were measured using a 100-ml specification expander.
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