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

CAN and SHOULD are the important words here.  CAN it be done?  Yes.  Should it?  NO.

 

Another very important factor here is that the original bridge will be destroyed in the process, so there is no option to reuse the bridge.

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