抄録
It is not an over statement to say that the progress and developmaent in modern medicine, and especially dentistry, has been a history of the battle with pain. A great number of our predecessors have made tremendous efforts to alleviate this pain. Because people request measures for painless treatment beyond what is necessary, most dentists will prepare vital teeth for routine protine prosthetic treatment only after giving the patient anesthetic. However, because of this anesthetic it is impossible to acquire important information related to the patiet's threshold of pain, which is a physiological response. Therefore it is thought that instances often occur where too much tooth structure is cut away during preparation of the abutment tooth, and the pulp is adversely affected.
It is customary to use an air turbine handpiece (300, 000 to 400, 000 rpm) and local anesthetic when preparing vital teeth as abutments. However, in order to minimize the pain of treatment we always use a high-speed, friction grip, contra-angle handpiece with an electric micromotor (160, 000 to 200, 000 rpm) when preparing vital abutment teeth. I would like to report that because of this I have been able to carry out prosthetic treatment without the use of anesthetic for most cases.
