Can dental implants be put in sideways?

Prior to placing the implant, your dentist would have taken a CT scan which would enable him to properly examine your bone mass and plan on where implants could most successfully be placed. Besides assessing where your bone is sturdiest, your dentist would also plan on the angle in which the implant must be placed. If your bone is at an angle, the implant also should be. That should not create a problem for you. The dentist will just need to ensure the crown atop the implant compensates for the angulation. I would urge having that crown/implant re-evaluated and adjusted.