Kant's dentology is the concept of intention over consequence.
Let me attempt to give a classic example used by philosophers:
There's a Y shaped train track. The train is programmed to run to the left fork and so the right one is sealed. Now, there are a bunch of children playing on the left fork and one child on the right fork (the unused one). The train's fast approaching. You have 3 choices.
1. Abandon control station
2. Let it run its course (to the left fork)
3. Turn it so that it runs to the right fork instead.
Choice number one, is of course, unapplicable in the case of your question.
Choice 3 would be following the Utilitarianism concept where happiness of the majority is always a priority. So, to please the majority, you decide to run it over the innocent child who did nothing to deserve the death.
Choice 2, however, would be following Kant's Dentology, in which the intention overrides the consequence of the decision/situation. According to Kant's Dentology, the very action of pressing the button so that the train runs over the one child in order to minimise loss, save trouble, save more lives etc is an INTENTIONAL action that kills the child. It is intentional. That's the key word.
In Kant's Dentology, it is not acceptable to carry out an action as a means to an end. and in this case, the fact that you are turning the direction intentionally fits the profile perfectly-- you are using the child as a means to an end(less deaths).
Just in case you were wondering, I opted for choice number 2 because I simply cannot withstand the fact that I am deliberately killing a child by pressing the button.
A parallel situation would be: 100 suspects. Would you kill the one innocent person in order to save trouble (or minimise griefing etc) and free the 99 or would you hang the 99 and free the one innocent?
Remember, the one child did nothing wrong. So in actual fact the group of children on the left fork were destined to die because they chose to play there while the one on the right did nothing wrong. Yet he's sacrificed in order to save the guilty. It's just wrong. So, yes in this case I am supporting Kant's Dentology.
There's also another judgement concept: the right or wrong concept. It's simple and literal. the child is right, the children on the left fork were wrong, so they die.