This time - no charge!
OK. You are missing a tooth.
Implant: You have at least 5mm or so residual bone thickness: Gum in the space (where the tooth used to be) is opened, a hole drilled ( progressively larger drills), then tapped, then a Titanium screw is inserted.
Technique 1: Gum stiched back over the implant, and the implant left (3-6 months) to heal in and 'osseo integrate' which is basically that the bone grows into a cellular contact with the metal. Then after osseointegration a hole is opened, a small collar screwed onto the implant, and gum left to heal, a week or two. Then the collar is removed, an abutment screwed onto the implant and a crown made. can either be cemented or screwed onto the abutment.
Tech 2: Similar to above, but no healing, but the abutment and crown are made asap.
Tech 1 negative - time
Tech 2 negative - less success %.
I did only Tech 1, and would myself only one that in my mouth.
Bridge: You have a gap.
The teeth on the side of the gap are shaped into pegs, an impression done, sent to a dental tech that mkes the bridge.
Think a bridge over a river, where the bridge rests on support on eac side, and a span over the river.
Bridges can be made with the span without a support on one side, think trampoline over a pool, but has to be made very rigid, and the tooth ( preferably minimum of two teeth) very healthy with no gum disease.
IMO a bridge is to be preferred if the teeth on the side of the gap have medium or large fillings.
Prices wary according to case and country, but a 3 unit bridge ( support-span-support) is about USD 3500, and one implant including crown about USD 4500.
A wellmade bridge, where the patients takes good care of it, should last 20-30 years. An Implant - life out.
Please note that there are many variables, in design, strength, cost, life, I took the average.
If you think of having an implant done, check which brand and use the Internet.
I would only accept an implant from certain manufacturers in N. America or Europe.
It is known that manufacturers in Asia use Titnium alloys that are cheap, but do not have the strength and ability to osseointegrate as well as the quality ones.
if an implant brakes - deep, deep $hit. Has to be removed with a trepane drill, then missing bone transplanted....
If an implant does not osseointegrate - deep, deepo $hit, as you lose a lot of bone around it and the adjacent teeth too.
Ask away if you have any more questions or I was not clear!