Micro perforation?
Could be a tiny pulpal (nerve) exposure or
a tiny perforation.
The pulpal exposure is when the nerve is exposed
usually requiring Root Canal Therapy (RCT),
A perforation is when the root or floor of the pulp chamber
is 'perforated' into the supporting bone.
These are two very different situations.
I cannot be sure what exactly happened during
your treatment.
WB
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