| Singular | Plural | |
|---|---|---|
| Nominativ | ptongus, ptongus | ptongi, ptongi |
| Genitiv | ptongi, ptongi | ptongorum, ptongorum, ptongum, ptongum |
| Dativ | ptongo, ptongo | ptongis, ptongis |
| Akkusativ | ptongom, ptongom, ptongum, ptongum | ptongos, ptongos |
| Ablativ | ptongo, ptongo | ptongis, ptongis |
| Vokativ | ptonge, ptonge | ptongi, ptongi |