Pain in one tooth when I chew food?!

Pain in one tooth when I chew food?

I got a filling in one of my bottom molars in March. No problems until 2 weeks ago. I was having a bowl of cereal, and the crunching hurt that tooth. Only when I chew on food. No other times and no sensitivity to hot. A little sensitive when it comes to cold.
I went to the dentist about 5 days after I got the pain, which was asap. She did a tap test and examined the tooth. Nothing. No pain. Nothing she can see. She took an xray, and there is no infection, and everything looks fine.
Well now it's been 2 weeks and the pain when I chew certain food on this tooth, still remains.
I've read it could be a fracture, but does anyone have any other ideas. And what could the treatment be. It's been bothering my mind.

As a dentist, this sounds like a fracture line in the tooth. Due to the time interval until now I don't think it has anything to do with the restoration being high. When you put pressure on a fracture, it opens and hurts the tooth. Most fractures of this type can't be seen and only show up when you are biting on something. Your dentist needs to have you bite on a piece of wood or a fracture locator at different spots on the tooth to determine where the fracture is. Tapping on the tooth won't show up most fractures unless they are large. Once it is located the Dr. can determine the treatment. Sometimes this is simply leave it alone to see if the tooth heals or a different type of filling but sometimes it requires a crown to keep the fracture from becoming larger and endangering the nerve. Good luck!