Can a 4 Tooth Bridge Be Attached at One End to an Implant and the Other End to an Original Tooth?

The good news is that with all the new materials and special connectors we have now days it might be possible to connect an imlant to a natural tooth, but it has to be done correctly.  The bad news is that you will definitely not be able to use your old bridge because a special stress breaker would have to be attatched to connect to the implant to acommadate the differents stresses of natural tooth versus implant.  Talk to a good dentist that does lots of crown and bridge and implants and have him look at your specific situation.

The way that an implant attaches to the bone and the way that a natural tooth ( root) attaches to the bone is different. This means that biting forces will affect both scenarios differently. If they are attached together through the use of a dental bridge, you can compromise the health of the implant or natural tooth or both. 

The general consensus and standard of care today is that a fixed bridge should not be attached at one end to a natural tooth and the other to an implant. There is a long explanation but basically you said it correctly.

The problem we have seen is that the bridge will come loose from the tooth but will stay connected to the implant. This can cause a cavity on the tooth because there will be no cement seal. Also, it will create a cantelever effect on the implant which will cause a lot of force and could break something or cause you to loose the implant. There are some creative things that can be done if there are no other options. You can incorporate a stress breaker connection to account for the movement of the natural tooth.

The other option is to place one more implant and make a 3 unit bridge on the two implants and then a single crown on your natural tooth. This would be the best long term option.

Either way, your old bridge cannot be used.

good luck

Dr. T