What does it mean when a Dentist says they put a pin in the filling?

I went to the dentist today for a filling and on the way out she said it needed a pin but should be ok and if I had any problems to give her a shout. What does it mean when it needs a pin?
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Additional Details
Thankyou NO . yeah she did say it was a big filling I just hate the dentist and want to run out as soon as they have finished. I never think to ask
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