32 
THE ANGULAR OR SHARP MOUTH 
necessary, perfectly efficient instruments can be made from an ordinary 
foot-rasp. Large projections require the use of the chisel and mallet or 
Fig. 7.—Tooth 
rasp w i t li 
re movable 
cutters. 
hammer. In the case 
Figs. 8, 9.—Tooth chisels. 
<U -M 
o 
4^ P 
CD 
5H 
O 
CD 
O 
CD 
s & 
p IP 
rP O 
.Sp.2, 
CD O 
.2 ^ 
o ^ 
O CO 
CO CD 
<D co 
13 
oj 
o 
<D . 
+3 CD 
O 
<D 
p tS 
cS O 
Cu 
- 4—1 ^ 
O o 
o o 
- 4 — 1 ^ 
60 
s a> 
P Eh 
r-H CD 
CD "02 
rP CD 
4-> P 
4 -^> 4 ^ 
03 ^ 
Cd H 
to 
cS 
g 3 
• r—I O 
Cj 
'P ^ 
CD P 
O O 
c3 O 
r p. 
CO 
• rH Ud 
- CD 
o 15 
Ti P 
£-> c 5 
CD '— 1 
CO 
<U 
4-> ^ 
p £ 
3 s . 
_ ^ p- 
p 'H o 
/“•. » i—H 
O ® bp 
H >5.S 
1 - 1 r-H 
I "p C-, 
• co 
O 
r-H P P 
& 
t—i 
of the back molars the chisel must be used with 
caution, so as to avoid injuring soft structures. The blow must be sharp 
but short; while, to prevent the chisel travelling too far forward, the 
