My dentist tends to do an X ray per year, so if you just go there for a check up, he will simply do the regular one, then might, if you are on good terms with the dentist, do the potted module as a no charge item, if billing queries he will simply mark it as "patient moved during exposure" which null rates it.
Have asked my dentist to call me when he gets a new Xray unit, I want the old one. Grumpy tube, low emission no problem, just have to either get some image intensifier cassettes to strip out as a light source or get a pack of black and white paper ( and a lot of buff envelopes and cardboard light barrier sheets) and rediscover the joys of hypo, fixer and stop baths.