I had a root canal in tooth #4 a couple of years ago.. It has since cracked, and now needs to be extracted. The teeth on either side of #4 each have extensive fillings and crazes and will need crowns soon anyway. A three unit bridge is more affordable for me at this point, but I am worried about bone resorption and losing the entire bridge if one of the abutment teeth end up having cavities. Do you think a single implant to replace #4 or a bridge would be best? I am only 32 years old. Any insights will be greatly appreciated! Thank you!