Bridges are the traditional method of filling the space left by a missing tooth in a fixed manner, i.e. not removable.
A bridge is usually designed using the teeth on either side of the gap as supports. In some cases this requires the cutting of otherwise intact teeth and almost always requires removal of sound & healthy tooth tissue. This inevitably reduces the long term prognosis of these support teeth and in some cases may jeopardise the pulp, or nerve, of the tooth, something that should be avoided if possible.
However, if adjacent teeth are already crowned or heavily filled, this may be an excellent option with no worse a prognosis than your current situation.
A bridge is reliant upon the underlying teeth supporting it for its long-term success. It is therefore important that your dentist has a very clear picture of the bone and gums supporting those teeth which will support the bridge.
Resin Retained Bridgework
These work in a similar way to conventional bridges but are attached, usually to just one adjacent tooth with a slender metal or ceramic wing. They have the advantage of being less destructive than conventional bridges but they are solely reliant on the bonding that holds them in place. This means that they work better in the front of the mouth and only where the bite is light and stable.