*RFA and Its Use in Implant Dentistry DOI: http://dx.doi.org/10.5772/intechopen.99054*

cross-threading of the peg from damaging the threads inside the implant. On the other hand, the penguin RFA unit uses Multipegs made of titanium (**Figure 11**). These pegs are multi-use and can be sterilized and re-used approximately 20 times before replacing. The reason they must be replaced is that after repeated thermal cycling in an autoclave, the ductility of the titanium peg can change and I have seen the small magnet become corroded, both of which can result in inaccurate readings.

**Figure 11.** *Penguin multipeg.*

**Figure 12.** *Penguin (L) and Osstell (R) calibration pegs.*

Both the Osstell and Penguin RFA units have calibration pegs (**Figure 12**) which are available. The Osstell peg is set to give an ISQ of 55 and the Penguin will give a reading of 45-55. Since the Osstell pegs are single use and calibrated at the factory, further calibration of the unit is not necessary according to the manufacturer. The Penguin on the other hand, with its multi-use pegs may benefit from the ability to check calibration as they are being re-used.
