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.  

The sensitivity could be from the bite being high.  You should also see if you are clenching or griding your teeth. If you are clenching during the day then keep your tongue to the roof of your mouth and that will help keep the teeth apart.  At night if you are clenching or grinding then you will need a nightguard to protect your teeth. If you still feel the sensitivity and there is a crack in the tooth then a composite filling may help in keeping the tooth together but you may still eventually need a crown on the tooth.      

The best way to go is with a crown , a filling would not work , its not as strong and molars are the strongest position for masticatory forces.a crown can be made in 1 visit , and will give you a good solution , and you would not present sensitivity no more.