zettai is not a glottal stop. Not sure what the term is, but it's a fricative of some sort. You're stopping the flow of air with your tongue on the back of your teeth.
A glottal stop is like "uh oh", where you stop the air with your glottis.
labiodental? err, i mean interdental? or is it alveolar? I know what you mean, like pausing half a step to put a barely perceptible extra bit of mass behind the release of the 't' sound.
A glottal stop is like "uh oh", where you stop the air with your glottis.