I do not think there is a difference between the two, mainly because, as far as I know, no vowel-sound is produced by using teeth in the process. Here you can find the IPA Chart of pulmonic consonants: http://www.langsci.ucl.ac.uk/ipa/pulmonic.html And here the IPA Chart of vowels: http://www.langsci.ucl.ac.uk/ipa/vowels.html