Honestly, my dog has cracked a molar - it was a very minor chip actually, and it was on a smoked marrow bone. NOT raw. I don't feed rec bones anywho, it's important to watch your dog, if they are chewing too vigorously and won't ease up then weight-bearing bones are not safe for them.
I feed my pups raw chicken bones often! They love chicken wings, leg quarters,necks and backs. I watch them extremely carefully, and I even hold Fozzie's for him. My boss was a Vet tech for the Vet who created Natura, which is one of the best lines of kibble out there... and she also feeds her dogs raw meaty bones for their teeth and for better physical condition/performance. I trust her opinion just about over ANYone's, she is seriously well-educated about canine nutrition. Labbreeder, I'm guessing the splintered chicken bones WERE cooked? That IS super dangerous, and something I would never even think of feeding. When my dogs eat chicken bones, they gnaw them into tiny, soft pieces that are very easily digestible - and I check the hardness of the pieces - not even a sign of bone in their poops. And Gonzo has NO plaque in sight since feeding raw. I, on the other hand, feel it's unfair to feed a dog synthetic chews for dental hygeine, rather than perfectly safe and very healthy raw meaty bones. Guess we have different opinions =P