Abstract
The present studies, as basic studies purposing to clarify the condensability of amalgam mix using a spherical alloy and a lathe cut alloy, examined the effects of various manipulative conditions. For the studies, a condensation apparatus for measuring the condensability, which makes it possible to measure the condensation height during operation, was contrived and applied.
The following results were obtained.
(1)The change of condensability became stable according to the increase of the number of thrust, and when the thrust number exceeded 75 or 100, it became almost fixed.
(2)The mixing time and the size of amalgam mix had little effects on the condensability.
(3)The mercury-alloy ratio, the starting time of condensation, the condensation pressure, the size of plugger in diameter and the cavity-plugger's area ratio had effects on the condensability.The effects were remarkable especially in the case of spherical alloy amalgam.
(4)Under the same condensation pressure, spherical alloy amalgam showed smaller condensability as compared with lathe cut alloy amalgam.
