Yes, I too know the feeling you are describing.
It should go away of its own accord, but why wait?
When your dentist phones back, do mention that you clench your jaw while asleep, if you haven't already done so. You might need a night brace to prevent this.
Does the jaw hurt when you open your mouth as if yawning widely?
If not you could try exercising your jaw by placing the tip of your tongue along the back of your lower teeth, then opening and closing your mouth slowly.
Make quite sure not to move your jaw sideways while doing this. Concentrate on moving your chin down and up in a straight vertical line.
You may well hear a creaking sound while doing this exercise, but as long as nothing hurts, just try to ignore the noise. It sounds very loud, as it is so near you ears!