Actually this is the definition of tooth crowns and this is what I meant. I actually found out that the tooth crowns are indeed accurately sized, but Saurian's T. rex continues to have some few minor innacuracies: the lower lips are placed to high on the lower jaw and the upper lips would easily pierce trough the gum like tissue like that. In order for teeth covering lips to work, the upper lips should be longer, covering the upper teeth even when the mouth was open, and the lower lips being placed lower on the jaw like this
d3qi0qp55mx5f5.cloudfront.net/… www.wired.com/wp-content/uploa… (I know these are not T. rex reconstructions. I am just comparing). But unfortunately Saurian's modeller pays little to no attention to how teeth covering lips should work. Also if you take a front look at it's head, you will see that the snout is to thin if we compare it even to the specimen that inspired the model (Stan).
These mistakes, however, are not seen in TSL's T. rex. So if it did not show those spike like scales on it's neck I would say that TSL's T. rex, depending on the skin shown, would be more accurate.