Patch,
Here is a quick lining 101, others please correct this if there are any mistakes.
Kerfing= verb, what you are doing when you make saw kerfs
Lining= noun, stuff you line your sides with to add glue surface and side stiffness.
Your question may have to do with classicals? The lining and the tentalones are different due to building process in a plantilla.
Tentalones: Separate little blocks glued in place
Standard linings-kerfs to the inside, usually triangle shaped. Pros- easy to make and install. Solid part against sides adds some material if the bindings are going to go deeper then the sides. Cons- They don't always lay super flat, so the pro of extra material for bindings has some holes in it, they are seen on cheap guits, so they don't add any curb appeal. Kerfs to the inside of the box do not add any stiffness to the sides.
Reverse kerf: Kerfs glue to the sides, adds stiffness by making a small torsion box. Does not add material for binding, if the binding channel is so deep as to go into the kerfing, there is possible glue mess on the inside when gluing the binding. The solid side to the inside of the box sometimes looks faceted especially at the center bout, where you can see it. To solve this the thickness after the kerf needs to be pretty thin making them a bit fragile to work with.
Solid: Adds stiffness and glue surface. Cons: Hard to make, Most wood is bending pretty easily at about .080 or so, so to make a 1/4" lining you need to glue up 3 slices of pre-bent material in a form, then the visible edge has to be cleaned up, which is bent now, so it gets a bit trickier.
Fox lining: Charles bends these in the bender to get them started. Has the advantages of all of the above, adds material to the sides for binding, becomes a torsion box for stiffness, looks good in the box. They are a bit time consuming to make, but not too bad, easier then solid. To see a picture about 2/3rds down on the page: http://www.frets.com/fretspages/feature ... fox02.html
AST A4 lining, must be very easy to install and lay flat, how ever I don't think they will add the stiffness that reverse kerf linings will. http://www.advancedshelltech.com/Produc ... front.html
Please add to or correct this list, hope it helps.
Rob
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All the major lutherie suppliers use it, so don't feel bad.