I'm so sorry to hear about this issue, and I am wondering if you went back to the dentist twice (once to see Ogata and then again to see Vasily and start Ogata's route again). If you saw Ogata twice at the dentist in build 2.0, it would end his route at Weekend 2, unfortunately, and you wouldn't be able to get to his Weekend 3 event.
That's the only thing I can think! Since it sounds like you already beat the game, I would download build 2.1 before starting another playthrough. That should resolve the issue. If it doesn't, definitely let us know!