Correct spelling for the English word "dentagra" is [dɛntˈaɡɹə], [dɛntˈaɡɹə], [d_ɛ_n_t_ˈa_ɡ_ɹ_ə] (IPA phonetic alphabet).
There is no dictionary definition available for the term "dentagra." It seems to be a non-standard or invented word that is not recognized by any reputable dictionaries. Thus, no precise definition can be provided. Sometimes, made-up words or terms may be used in specific contexts or communities, but they do not have an established meaning in the general language.
1. Toothache. 2. Tooth-forceps.
A practical medical dictionary. By Stedman, Thomas Lathrop. Published 1920.