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Lectures on Operative Dentistry, ;

Bacteriology and Dental

Pathology.

By G. V. Black, M. D., D.D. S., S. C. D., LL.D.

FIRST LECTURE.
November 14, 1900.
I want to speak to you this morning with reference to
some points in the infirmary practice. I shall do this for a
few times before I begin my regular course of lectures. I
shall speak mostly in regard to matters that have not been
treated in the little books on technical procedures in filling
teeth, and particular points where I notice failure among you

in your infirmary practice.
nixing Amalgam.
The first thing this morning I will speak of is the mix-
ing of amalgam. I notice that many of you are failing in the
mixing of your amalgam ; in fact, I may say that your pro-
cedures in this I regard as careless. I do not think that
you give the matter in your thought sufiicient importance.
Now it is very important that amalgamation between the
mercury and the filings be very perfect. In the older alloys
that were made with a smaller proportion of silver, compara-
tively, the amalgamation was very readily brought about
the mercury and the filings seemed to take to each other
readily, and many of the older dentists who are still using
these softer alloys will rub up the mercury and the filings in
the hand and seem to get a very perfect mix, and it is a mix
that is sufficient for those softer alloys, those alloys that
swell and shrink, because if we have a small amount of sil-