After examination, the comparison of the current Guedel and Berman airways are dimensionally very different in relation to the proportional measurements and it is easy to see that these inconsistencies do not correspond to any design and anatomical logic.
Further our studies showed that in Guedel and Berman oral airways there are no proportional dimensional standards being employed to the length change in the bite block and the radius of the C curve. When no proportional standard is employed than this impacts the radius of the back body portion and how it will control and impact the anatomical structures of the oropharynx, i.e., epiglottis, root of the tongue, etc. These dimensional inconsistencies greatly impact how either airway design functions in relation to the anatomical requirements to keep an airway open.
It should also be noted that without the jaw-thrust design element, the relaxed jaw will allow for the relaxed tongue to fall back into the oropharynx because there is nothing to support it, resulting in more than a 10% airway obstruction, causing complications for the anesthetist and the patient.