I placed the needle into the PDL space as instructed and I keep getting an
“OVERPRESSURE” alert and the unit stops, what is the reason for this?

You may have blocked the orifice of the needle by pushing to heavily on the
hand-piece or by placing the bevel of the needle flush against the bone, prohibiting
the anesthetic from flowing freely. There are also situations in which
you have cored a tissue plug and the needle becomes blocked. These are all
situations where the unit is reading more pressure than it should so the unit
will shut down as a safety precaution.

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