Pain after crown and 3 adjustments, so I need another adjustment?

I recently had a crown implanted on a tooth which previously (many years ago) had had a root canal. I have had 3 adjustments to date and it's still sensitive. Specifically, it's sensitive when I bite down on anything remotely hard (not hot or cold sensitive, just harder foods like a nut). Do I need yet another adjustment? I'm beginning to consider seeing another dentist. Thanks.