Of course you can. You need to go to the local grocery or pharmacy and pick up temporary cement like Denttemp. Buy two or three doses of this, because it may come out again before you see the doc. Sometimes denture adhesive or even sugar free gum can work in a pinch, but the Denttemp is better. Make sure you clean out the crown and clean the tooth you are placing the temporary.Then make sure both are dry and practice placing the crown a few times without the cement so you get a feel for this. Then place the cement in the crown and place it on the tooth and bite down and hold in place. Make sure you floss and clean off all of the excess cement from the tooth and tongue an check. Brush the tooth and rinse. Thats it! Make sure you keep your dentist appointment and have him seat the permanent crown, Julian, and good luck!