Lets also reflect why you don't have weapons made of bone... they don't hold an edge very well

. Are you going too run around carrying a tooth? Which by the way would only be good for stabbing, its 'edge' is not going to be sharp as steel.
Its hard, which makes it good for armor, but it is not sharp which is what you need for a good weapon. Now I could see a dragonbone hammer, or a dragonbone mace. Which would be of bone, and have teeth or fangs for the spikes on the sides. A dagger I could even see, but you couldn't make a realistic sword or axe out of dragonbone.