Mesh is used in surgery all the time and it is generally safe. However, I see no utility in it's use for a standard tummy tuck. Do you have a hernia? Why is this coming up?
Is this a cosmetic abdominoplasty? Or are you undergoing a reconstructive procedure (i.e., breast after mastectomy) in which the surgeon is using a TRAM flap? More information would be needed to answer this question fully.