It's a possibility, but I'd suspect something else. If you haven't done it already, you might wanna check how the dent looks like and what might have caused it. Front axle can get pretty close to the oil pan under extreme articulation, and if you haven't added any bumpstops it's possible that happens.
I managed to hit my oil pan with the steering shock mount attached to the drag link (on the ORO U-Turn kit). I mounted it in a slightly wrong place, and since that I removed it altogether since I have no need for a SS.
Btw, there isn't too much extra space at the front of the oil pan so I would make it absolutely certain your oil pan isn't hitting the crankshaft (which you obviously would hear) or the main bearing caps.
i say if it isn't clunking and it isnt leaking...you're fine. also, if you can still easily remove the plug you're fine.
one thing to check though is the torque on the bolts. since the pan was hit apparently hard, you'll need to make sure the gasket wasnt crushed more than it was supposed to be. so...torque the bolts.
i had some idiot lift the front of my camaro by the oil pan...put a nice dent right in the middle of the pan...where the plug was. the plug was pulling off shavings so i replaced the pan with a canton race pan. everything's good now.