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230 OPERATIVE DENTISTRY

once established, a few Aveeks' neglect often resulting in irrepara-
ble injury. These visits should be established at regular and fre-
quent intervals, as the most unhygienic conditions may result from
only a few days' neglect and upon earl}' detection and eradication
depends the success of interference. •
Length of Time at Each Sitting should not exceed thirty min-
utes for a child under twelve years of age and should not exceed
one hour until after eighteen years of age. Great care should be
exercised in causing the child anj^ considerable amount of pain.
Better that the filling consist of temporary stopping to last but a
few days than to cause lasting memories of dental pains inflicted
by the dentist.
The Filling Materials to Be Used are limited to those of speedy
Dianipulation, and those requiring a minimum of convenience
form. This Avill place in the list, amalgam, tin, gutta-percha and
cements.
Cavity Preparation should be limited to the removal of the ma-
jor portion of deca.y, sterilization and securing the cleavage of the
enamel in cavity outline by the use of the chisel. All else should
be avoided.
Extension for Prevention, Extension for Resistance, Flat Seats
for Fillings, Line Angles and Point Angles and all else in cavity
preparation so carefully applied to filling the teeth of adults
should be ignored when dealing with deciduous teeth. If decay
has not left the cavity naturally retentive, cement should be re-
sorted to instead of cutting.
Cavities of Class One. Pit and fissure should be filled with
amalgam or tin under as dry conditions as can be secured Avithout
the rubber dam. The use of the rubber dam should be restricted
to the six anterior superior teeth and when used should be very
loosely ligatured.
Cavities of Class Two. Proximal cavities in molars should be
filled Mith amalgam. AVhen the retentive form is not good in the
cavity without much cutting, the amalgam should be laid in soft
cemelit.
When Two Cavities Exist in molar proximal space which are
r^ot retentive it is good practice to fill the tAvo cavities as one,
counting on refilling the cavitj- in the second molar if the first
molar is lost early, or perchance Avhen this has failed, Avhich it Avill
sooner or later, the cavities Avill return Avith independent retentive
form.