E rua ngā momo o ngā taputapu porowhita porowhita, ko tētahi he porowhitataputapu piko, ko tōna toki nui me tōna toki iti e tūtaki ana; ko tētahi he taputapu porowhita porowhita hypoid, me tētahi tawhiti rerekē i waenganui i te toki nui me te toki iti. He whānuitia te whakamahinga o ngā taputapu porowhita porowhita i roto i ngā mara tuku miihini pēnei i ngā motuka, te rererangi, me te keri maina nā ō rātou painga pēnei i te tauwehenga taupatupatu nui, te kaha kawe kaha, te ōwehenga tuku nui, te tuku maeneene, me te iti o te haruru. Ko ōna āhuatanga ko:

1. Taputapu piko tika: He rārangi tika te rārangi niho, e whakawhiti ana i te tihi o te koeko, e whakaiti ana i te niho.

2. Taputapu piko porowhita: He rārangi tika te rārangi niho, ā, e pātata ana ki tētahi pūwāhi, e whakaiti ana i te niho.

3. Ngā taputapu porowhita porowhita: ngā taputapu ka taea te hoki whakamuri (he pai hoki mō ngā taputapu he rite te teitei).

4. Taputapu whakarara porowhita cycloid: niho kōpiko.

5. Taputapu porowhita porowhita kore tohu: Ngā niho whakaiti takirua, βm=0, e whakamahia ana hei whakakapi i ngā taputapu porowhita tika, he pai ake te pumau, engari kāore i te rite te pai ki ngā taputapu porowhita porowhita.

6. Taputapu whakarara niho cycloid kore-tohu: Ngā niho kōpiko, βm=0, e whakamahia ana hei whakakapi i ngā taputapu whakarara tika, he pai ake te pumau, engari kāore i te rite te pai ki ngā taputapu whakarara porowhita.

7. Ko ngā momo niho teitei o ngā taputapu porowhita porowhita e wehea ana ki ngā niho iti me ngā niho teitei ōrite. Ko ngā niho iti ko ngā niho iti kāore i te ōrite te tawhiti o te pane, ngā niho iti te tawhiti o te pane ōrite me ngā niho iti takirua.

8. Niho whakarara: he rite te teitei o ngā niho o te pito nui me te pito iti, e whakamahia whānuitia ana mō ngā taputapu whakarara e piupiu ana.

9. Ngā niho whakaiti wāhi kore-isotopic: he ōrite ngā pito o te kōne iti, te kōne o runga me te kōne pakiaka.