Page 201 - My FlipBook

TIN AND NON-COHESIVE GOLD 169

Method of Working Tin or Non-cohesive Gold.—The

cavity preparation is practically the same as for cohesive
gold, except that deepening of the convenience angles is

Bll *
ll' i
m
'll IJi

i

Fig. 184.—Plugger handles.

omitted, and, owing to lack of edge strength in the material,
enamel bevels should not be so acute. Simple cavities with

four strong walls are a necessity. All filling materials are