Rest assured, there aren't any microscopic cracks. If there were any, your RAM slot wouldn't work at all.
Relax some, take a walk outside.
PC hardware is very durable and i'm sure that you didn't damage your RAM slot.
For example: In my early years of PC building (about 15 years ago or so), when trying to insert a RAM stick, i put so much pressure on the RAM slot that the MoBo itself did bend quite a bit. Only realizing afterwards that i didn't opened one RAM clip that holds RAM in place. That explained why the RAM didn't go in. I opened the clip, put the RAM in without much effort and turned on my system. Everything worked fine, like nothing happened. In the matter of fact, i still have that old PC (Pentium2, 266Mhz) in running conditions, despite it being over 18 years old.