Use of Medrex in dentistry.

Silent colour footage with no intertitles demonstrating the application of Marrett's 'Medrex' circuit used in dental anaesthesia. Firstly, the contents are described as 'general points of technique' ('acting'; possibly recreations of a male patient being anaesthetised), then children ('live'; girl, then boy both about 8/10 year's old) extractions of fillings, adult (live; a woman) insertion of endotracheal tube without relaxants for lengthy surgery, resuscitation, hyper-ventilation with oxygen (acting).