Maximal Incisal Opening--a Diagnostic Index?

@article{Sheppard1965MaximalIO,
  title={Maximal Incisal Opening--a Diagnostic Index?},
  author={I M Sheppard and Simon M. F. Sheppard},
  journal={The Journal of dental medicine},
  year={1965},
  volume={20},
  pages={13-5}
}