Are you trying to avoid asking w to do the dentist trip? Because it sounds confusing and a little bit annoying to leave it unclear and make her ask. When you sent the dentist appointment time but didn't say can you bring her, that was unclear. And then when she asked for clarification you still didn't say "yes, can u do it? i can if you're busy" For coparenting try to seem less squeamish about nailing down plans regarding D.
Not to mention YOU made the apointment without asking your wife IF she could make it then, or wanted to go, OR if you could just handle it all yourself.
You "informed" her of the date YOU had already arranged and left her to infer that SHE would take her, unless she "asked" you to do so.
You put her in the position where she HAD TO ASK you b/c you did NOT volunteer to do it, "unless SHE was 'busy",( which is arguably you prying into what she's up to, which is arguably, none of your business.)
Why not call her BEFORE the call to the dentist, to say you want to make the appointment, it's covered by insurance and you'll take her, UNLESS wife wants to...
hmm?? SP, If that did not even cross your mind, you need to spend some time thinking about why.
M: 57 H: 60 M: 35 yrs S30,D28,D19 H off to Alaska 2006 Recon 7/07- 8/08 *2016* X = "ALASKA 2.0" GROUND HOG DAY I File D 10/16 OW DIV 2/26/2018 X marries OW 5/2016