What is the best technique for recreating the belly button during a tummy tuck?

Thank you for your question. You are right, a belly button can be a give away of previous surgery. We all strive to recreate a normal looking belly button and this depends on technique used, patient's ability to heal (infection, partial necrosis, scarring ability). I prefer to use an upside down lazy "V" or chevron incision to bring out the BB. This creates superior hooding and the lower abdominal flap I create is brought inside the BB to not end up with a "Target" sign. See web reference below.

abound as do the incisions used to allow the belly button to be inset but as you appreciated, the scars around the belly button are a dead giveaway.  If your belly button isn't attractive, or deep, you may consider giving up your belly button and having one reconstructed later.  This produces a inverted V shaped shallow belly button that is not surrounded by a scar.

Great question and you are right: the belly button is important since it shows more often. A couple general rules that I follow: not too big, natural shape, and an "innie" is preferred. Sometimes if there is a hernia, revision surgery, or other issues, the belly button itself may not look as natural. If you have a normal one that's an "innie" now, it should stay that way and look great after TT.

There are many techniques for
umbilicoplasty or addressing the belly button during an abdominoplasty.  This tells you that there is no one way that
works on every patient all of the time. 
It is probably best to review your surgeon’s picture gallery and ask
questions directly to see what particular technique appeals to you.

Patients are sometimes surprised that a tummy tuck does not make a new belly button.  It just brings your belly button out through a new opening in the skin.  Most preoperative belly buttons in TT patients have a horizontal orientation due to excess skin and a skin fold right at the belly button location.  I try to make a slightly vertical oblong opening for the new belly button because it looks more youthful.  I also trim the deep fat around the new opening to contour this area.   Also, scar management is super important.  A wide or dark scar around the most awesome belly button is a TT give away.  I have my patients tape their scars until they are faded and also warn against sun exposure until the scar has faded.  Also, the belly buttons that tend to be most difficult to deal with surgically are those in which the patient has had major weight loss (because the belly button stalk is really long and floppy) and belly buttons with previous scars or belly buttons associated with an umbilical hernia.  Sometimes the little belly button is the hardest part of an abdominoplasty!

The belly button or umbilicus in a full abdominoplasty must have a scar around it since it is left in place and then brought back out at the end of the surgery through a new hole.  There are a number of techniques that have been written about and in the end they are all very similar, a variation of a chevron incision.  What few surgeons will talk about and almost no scientific papers on the subject mention is the ultimate result depends largely on how you heal.  All scars shrink and if you are a heavy scar former you are likely to get a less than satisfactory umbilical shape and outcome.  Unfortunately, scarring has far more to do with the result than the technique used.  
Most surgeons, although they do not like to admit it, will ultimately tell you that a tummy tuck is so that you look good in clothing and not so that you can wear a bikini.  If you get a great umbilical scar that is a plus.  Look for a surgeon who is honest about this up front.
I have provided a link about tummy tucks and a video about recovery for you.
I hope that helps.  
Best regards.

In 99.99% of TT's the belly button is still your original one, not moved, removed, or made from scratch. The key to the final result is what shape and size hole in made to bring it back out through. I prefer a modest vertical oval shape because it elongates the abdomen and accentuates muscularity. Small rounf and big round ones and triangle shaped ones look odd to me. It is also helpful to have a little fat around the umbi, if you are too thin it never looks great.