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The upper dentition would correlate with rostrum width, which should correlate with zygomatic width, within a closely related group, of course. I'd infer lower dentition could maybe correlate with mandible width, which should correlate with zygomatic width. Considering dentition are such poor predictors, I am not sure if this would work that way in reality. Most data has just AP diameters of teeth, making it even harder to analyze for correlations.