One of the black wires at the dimmer is the feed, it was spliced with other black wires going elsewhere to feed other outlets, one probably the outlet you worked on.
There should be one wire at the dimmer that did not connect to the large splice , and only went to the dimmer. This wire should be going to the outlet or light the dimmer was/is controlling.
Either you spliced something wrong, of when you pushed the wires back in the box, you may have pinched or nicked a wire, assuming a metal box.
What is the dimmer controlling?
You will need a tester to check for the one hot feed in the dimmer box. If you know which wire is being controlled by the dimmer, then all the other black wires should go to the feed.
If there is no power at all in the box, then ned to check all the breakers, not just check to see if they are tripped, but need to open the box and test each breaker to be sure there is power leaving.
Opening the panel is dangerous and should only be done by a pro, unless you are skilled and knowledgeable enough working around live power.
ANother thing that can happen is that a splice in another box feeding the one you worked on may have failed. Finding that will require opening every box in the circuit one at a time.
I hope this helps. If not get back with more questions. Any chance of furnishing pictures of what you have? It may help to see what you have.
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