The present paper is concerned with premedication, preanesthetic evaluation and postmedication. It must be clearly understood, however, that I'm speaking from the viewpoint of the office practice of oral surgery, using sodium methohexitol as the principal agent.
As the consumption of reamers is much greater than that of files in Japan , it can be safely assumed that most dental clinicians use some kind of reamer for the purpose of root canal enlargement in their daily practice. In his survey on 659 instruments fractured in root canal HIGAKI  reported 592 of them to be reamers with a percentage as high as 89.8%. There are available published research results on the material strength of various root canal enlarging instruments [3, 4, 5], but the author believed that changes in the thickness of blades and edges in root canal enlarging instruments would be intimately concerned with the thickness of dentin to be cut inside the root cavity, when a mechanical enlargement is attempted. Therefore, he conducted a series of investigations into the cutting mechanism, distorsion, its relation to the cutting depth of edge, thickness of cutting chips, shape of cross section of blade and its relation to its cutting efficiency in a selected sample of reamers.
KAZUYA HIROTA of our Department has published some time ago his findings on the toxicity of trichlorethylene, used in the dental field as a local anesthetic agent . It has been known that this drug sometimes brings about a serious cardiac disturbance and BORNES and IVES  reported that trichlorethylene promotes the sensitivity of adrenalin and is responsible for the irregular pulsation. MORRIS  also pointed out that it even brings about the ventricular fibrillation. The present paper is another contribution to the toxicity of trichlorethylene and it will be of interest when our findings are compared with those of HIROTA here and there.