Pediatrician - Dr. Nancy Hesz at Star Pediatrics in Xenia - it's a little bit of a drive, but she's really great
OB/Midwife - I really love the midwives at Lifestages (based at Good Samaritan Hospital, but they have some satellite offices too). Also, Dr. Horlacher at Miami Valley is great. There's a group of midwives at MVH too - Midwives of Dayton I think? Some people really love them. I love *some* of them, but not all, just my personal opinion though.
Chiropractor - Dr. Christine Dobran in Kettering, hands down. She is super, awesome, fantastic. I can't sing her praises highly enough :-)
Dentist - For adults or the kids? I've got nothing for the adults, but Dr. Jody Wright at Wright Smiles in Springboro is awesome. The other dentist in her office is really nice and quite excellent as well.
So, that's not everything, but it's something to get you started :-)
If you are looking to make friends / connect, there's a La Leche League group that meets once a month in East Dayton. I think the second Tuesday at 7 pm. I haven't been in a few years, but I met a lot of nice moms when I was attending a few years ago.
We live about 40 min. SW of Dayton now, but I group in Kettering and lived in Dayton the last 5 years before we moved, so I'm pretty familiar with the area :-) Lmk if you have more questions - you can send me a pm if you want.