Abstract

References
1.
Cobin
H P
. (1969 ) N. Y. St. dent. J.
35 , 552 .
2.
Gerry
R G
. (1966 ) J. prosth. Dent.
16 , 316 .
3.
Gray
P G
Todd
J E
Slack
G L
Bubman
J S
. (1970 ) Adult Dental Health in England and Wales in 1968 . London.
4.
Hurwitz
L J
. (1968 ) Brit. dent. J.
124 , 167 .
5.
McMillan
D R
. (1962 ) Brit. dent. J.
112 , 399 .
6.
Toller
P A
. (1969 ) Brit. J. oral Surg.
7 , 47 .
