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Using an implant to fill a gap is better than a bridge for many reasons. Probably the most important one is the "weakest link" problem. The whole bridge will fail if any of its parts fail. If you use an implant, all of the teeth stand on their own merit. So if there is a problem, only that tooth requires attention.
The other reason is bone support and huygiene. Without a tooth present, the alveolar bone of the jaw will disappear. The implant will stimulate that bone to remain and be strong in the same way that a tooth does. In order to keep the area around the implant clean, you brush and floss the same way you do around a regular tooth. Cleaning under a bridge is far more difficult and involved.
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