Page 710 - My FlipBook

708 ORTHODONTIA AS AN OPERATIVE PROCEDURE.

A new application of force has been lately introdueed, viz. the
elongation of win; by pinching or compressing it with s])ecial round

Fio. 633. Fig. 634.

^yip'i^k

Coffin spring plate for lower arch. Coflin spring plate for single teeth.
pliers, shown in Fig. 676. This may be used in many places in,stead
of the jack-screw.
The ccHistruction of jack-screws and drag-screws has been greatly
simplified. Thin soldered bands are cemented to the teeth, or " anchor
bands," the ends of which are united by screw and nut. To these
bands tubes arc soldered for the attachment of appliances which are so
constructed that force once applied need not be withdrawn till the en-
tire movement is accomplished. A rest may be allowed, but no back-
ward movement. Thus no interference is made with building up the
tissues behind the tooth.
Appliances, complete or in parts, to be adajited to special cases have
been put on the market by Prof. Angle. These more nearly fill the
want of one who cannot make all his appliances.
Dr. V. H. Jackson's method consists in the use of piano wire or
other elastic wire for force and the attachment of the wire to the teeth,
in most cases, by means of a "crib" made of the wire itself, and not
by means of bands or plates.
For full descriptions of these methods the student is referred to the
writings of the authors themselves.^
General Directions.
All metallic bands which are to remain in contact with the teeth for
any length of time should be cemented to them with zinc phosphate, to
prevent deleterious action of acids of fermentation which would be gen-
erated and retained between bands and teeth. The rubber dam should
be applied whenever possible to the tooth to be banded, and to one or
'In the American Text-Book of Pros^thetic Dentistry, edited by Dr. Charles J. Essig,
will be found a chapter on "Orthodontia Technic," by the writer, in which tlie making
of regulating appliances is described much more fully than is possible here.