Can absolutely burn a corpse. Time/temperature that's all one needs, one can trade time for tempeture etc... These "ovens" are wood fired Italian ceramic style, Roberta's has the very same style.

Obviously bone requires more effort, once the bone has been "cooked" throughly, it's crystallized-salts basically. Dump those remain's, in the 28-quart Holbert mixer (located in most all commercial kitchens) especially in a pizza joint!

Now you have flushable dust!