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I want to maintain the edges of a surface pinned while I'm sculpting it to keep its positions. Is this possible?

Edges that I want to pin

After sculpt, the edges change its locations

enter image description here

Thanks for the comment! But the problem after hiding the edges, is that it generates a flat face. I want that part also constructed with a grid

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    $\begingroup$ Does hiding them work? Select the edges you want "pinned" and press H to hide them, Blender generally keeps hidden geometry untouched $\endgroup$ – Duarte Farrajota Ramos Jul 15 '16 at 22:25
  • $\begingroup$ Alternative : using the mask brush. But in both cases you'll have what you called a 'flat face' in your edit. You'll need to smooth it manually or add additional edges loops $\endgroup$ – lemon Jul 16 '16 at 15:13
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Like lemon already suggested, the masking tools are your best choice. Yes, you will get the flat faces as well, just as with hiding them, but afterwards you can - with the mask still active - smooth the borders using the smooth brush.

on the bottom left of the screenshot you can see the Hide/Mask menu. Choose one that fits you best. My example is so simple I was able to use box select for this. Basically mask everything except the boundary.

Hide and Mask Menu

after that, you'll see that the inner part turned black (that means it is masked), and the outer part is grey (editable).

Boundary is white

We need the opposite, so we invert the mask with Ctrl + I

mask inverted

Now we can sculpt as we like, ignoring the fact that we get heavily distorted faces on the outside.

face distorsion

With the smooth brush, this can be fixed easily and with a lot of control!

Smoothed result

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