Hello and welcome to HCM forum,
i would be glad to answer your query,
First of all ,i would like to inform you that whenever a tooth is fractured, we as dentist
take an x-ray to confirm exposure of tooth nerves.
Then a temporary filling is placed over the tooth to check if there is infection or pain associated with it.
I do not know whether your dentist followed the same steps or not . But if pain is associated with the tooth following a filling, it is a clear indication for infection.
I will advise you to see a specialist(endodontist) as the tooth might require root canal treatment
Antibiotics alone will not resolve the infection,
i hope this answer was useful,
i wish you good health.