Cindy Trosen Sundet, DDS

Most importantly, do not smoke.  
1) Smoking will increase healing time, decrease white cell count, increase the chance of a "dry socket".  A "dry socket" is when the blood clot has been lost, usually from smoking, sucking from a straw(any negative pressure), exercising right after, poor health, diabetes, etc.  The bone is actually exposed and needs to be covered with daily or every 2 days packing placed in your dental office until it heals from the inside out.
2) be sure to keep hydrated with water, juice, fruit, watermelon, ice-cream, (no straws).  You can also increase your nutrition with Ensure and other supplemental drinks.  You can add ice cream or just place it in a cup and in your freezer.  Use a spoon and eat it that way.  Soft food such as scramble eggs, steamed soft vegetables, tuna sandwiches, etc.
I hope you are considering implants to replace those back teeth.  Front teeth do not stay healthy and in place long if you have no back teeth to support them.   Remember after 25 +, front teeth are mainly for looks :), do not use as tools.  
Please follow up with your dentist as he/she has your dental and medical history to help you the most.   I can only give you general information not necessarily specific to your situation.
Best Regards.  (sorry this took so long to respond, I just found your request for answers.)

Do you have a few photos(selfies) you can submit, front and profile, repose and smiling?
I can see you have listened carefully to your post surgical instructions. You are very articulate in your request and seem very reasonable in your requests.  I think it is very important that you have a follow-up appointment with one or both your surgeon and restorative dentist in the first week of surgery.  It appears to me that you a understand that healing takes time, and have reasonable expectations that this is a provisional "flipper", it probably has composite teeth set in a pink plastic retainer type "flipper".  There are ways to make a
"flipper" look and feel better as soon as you are healed enough to have another impression or maybe they can even change the one you have, though you would be without it for at least 24 hours. It will not be the same as the beautiful porcelain crowns that will be placed on the implant abutments when healing is complete, but it can look nice and function well.
I am a restorative Dentist.  I like to see my patients Day 2 or 3 to make any necessary adjustments to your "flipper".  This is important to confirm that your "flipper" is not impinging on surgical site, occlusion(bite) is accurate, function/speech, and aesthetics are what everyone expected.  The "flipper" is usually made as close as possible to what the surgical area will be.  We don't know until after the swelling is down, so we approximate it on the models.  
Perhaps you can have the "flipper"adjusted for now, if possible thinned at the palate(if it does not make it to unstable), review home care, and adjust any occlussal concerns.
In a couple of weeks a new impression can be made (providing healing is going well), and a 2nd "flipper" can be made to accommodate the design, above requests and engineering required to get you to the next step in your reconstruction.  
This "flipper" can be used as a "trial provisional" that you and your dentist can use to tweak the details out for your Implants. There is usually a charge for a 2nd "flipper" and that is not wrong.  I would continue to keep on the positive as making a provisional "flipper" that everyone is happy with, helps with the porcelain implant design. 
Phoenetics are just as important as aesthetics and function.... as you know so well.
In the mean time, practice saying out loud "60, 61, 62, 63, .... through 79".  This will help your tongue adjust to this device in your mouth.  You may find yourself over articulating at first.  Hang in there.  I am sure you will appreciate the end results.   Best Regards,

Here are a few comments to consider:

"Do I need to buy a new implant to make another crown?" .... Not   

   necessarily.

   Please have your implant evaluated with a radiograph, periodontal pocket       depths and occlusion(bite) by your Dentist.  

  Most likely you will not need  anew implant or new implant abutment if all

    all is healthy.   You will need new impressions after your original crown

    is taken off.

   

"What if I do ...teeth whitening before I do the new crown? Will I have a color difference in the future?"

    Yes, you can bleach your teeth before you proceed with new crowns and 

     fillings if necessary.  Your Dentist can document your present shade on a

     shade guide and show you where you may end up after bleaching.  Once 

     you have bleached your teeth it is usually a permanent lightening of your 

     teeth.

     Your teeth may darken if you smoke, drink a lot of coffee and tea, etc.

     However, you can always bleach again to bring back to match to the 

     shades you, your Dentist and Porcelain Ceramist agree on.   You may 

     want to discuss bleaching trays to bleach as well as Zoom in office 

     bleaching treatment.  If you decide on bleaching trays, you will have them 

     for future "touch ups".  Please consider to not bleach lighter than the 

     whites of your eyes.  You may find this a most pleasing effect.

     Best Regards,  

     Cindy Trosen Sundet, DDS