Table 1. Summary of output current plotted for different voltages after implantation of the piezoelectric vibrator.

Parameter/implant time	In vitro	Immediately after implantation	After 1 week	After 2 weeks	After 4 weeks	After 12 weeks
Voltage (mV)	3.5	3.2	3.0	2.8	2.6	2.1
Current (nA)	60	54	48	43	39	31