I have cracked teeth due to deep filling in molar. Sensitivity and pain 6 weeks later. Bonding or crown?

I would encourage you to go ahead and get a crown on that tooth, if indeed, it is cracked.  If you go with bonding (to save money), you can risk fracturing the tooth more, then needing to have the tooth extracted and replaced with a 3-unit bridge or an implant.  I know that crown may seem expensive, but it is your least expensive fix in the long term.  Good luck and I hope this helps. Follow me if you have more questions.Sarah Thompson, DMDSt. Louis, MO area (O'Fallon, IL)Real Self 100

A permanent crown is the answer to your question. It is the most predictable answer to your question. . This will have you chewing at a 100%. It sounds like a filling will not be enough for that tooth. You may also need a Root canal on the tooth depending on the extension of the fracture.

If your tooth has tested positive to the biting or fracture detector test, I have found that placing a crown is the most predictable method of achieving a successful outcome.  Because the previous filling was deep and you have been experiencing some sensitivity and pain over the last several weeks, you may also require root canal treatment either now or in the future.