That's some weird, suspect timing following the implant, but even though epinephrine at the dentist is a notorious trigger for some, the fact that the repercussions would typically be expected more instantly makes it sound like coincidence can't be entirely ruled out(?).
Also, as you may be well aware, even following decades of consistent behavior, we can still expect CH to pull a change up on us, and start a cycle in a never-before-experienced fashion, such as a slow ramp up with advil etc. abort-able attacks at first. Hate to think it, but I would be bracing for some possible continued ramping up.