Hello Madam,
This biotin filling placement is a procedure called direct pulp capping in which a pro-generative filling is placed upon a recently opened pulp which is yet not infected. This helps tissues form new dentin layer below the filling.
After about 4-6 weeks if your x-ray reveals dentin layer under the filling and your symptoms reduced then this filling will be replaced by a permanent filling.
If problem persists then root canal will be done by your dentist. Hence your dentist has tried to preserve vitality of your tooth by this procedure. Hope this satisfies your quest. Take care.