How much would it cost to replace for 4 molars on my lower jaw (2 on each side)?

As your Xray is not visible properly, so it's my request to upload a digital x-ray copy[not clicked one], so I can guide you better. But I feel there is not enough bone for the implants, so you have to go under implant surgery followed by a bone grafting procedure.

Since you had permanent porcelain crown after a root canal therapy, what you see as far as length and width,  is what will be! If you feel the tooth is shorter and longer, it will not move, so if you have any concern that it does not look right to you, contact your dentist to...

Four to six months is the average healing time for the bone to integrate with the dental implant for the top teeth.  There are cases where the tooth can be added to the dental implant at the time the implant is placed; however, those are very specific circumstances with many variables that...

Lets examine your risk factors. It appears that you are decay prone as noted by your need for several root canals and multiple crowns. You have new decay under a recent crown. You are a clencher in the day time and night time. The clenching is strong enough to break teeth.  All...

Are you sure that this is an implant ?  If this is the remainder of the temporary crown then yes it can be remade but not just glued in.  This would require a new abutment that is screwed into the implant and then a new temporary crown.  However it looks like from the...

No, only metallic objects that are on / in / through your head. Since the xray is limited to your head, you will not have to remove it.