Funny. Two of my favourite animals!
i doubt the komodo dragon's fangs would make it through the thick fur and skin of the polar bear, not to mention past the bears paws the size of the lizards head. The komodo dragon usually attacks out of ambush (if it can't find any carrion), aiming for the flanks or throat of its prey, commonly goats or deer that rarely possess paws.
But if 100 duels were to fight, the komodo dragon would have to be cloned in order to attend the duels. The bear would suffer from exhaustion and eventually become unwary, revealing sensitive body parts, vulnerable to the ectotherms poisonous bites.