Abstract

References
1.
Begg
P R
, (1954 ) American Journal of Orthodontics
40 , 298 , 373
2.
Beyron
H
, (1964 ) Acta odontologica Scandinavica
22 , 597
3.
Cohen
B
, (1959 ) British Dental Journal
107 , 31
4.
Critchley
P
Saxton
C A
, (1971 ) Helvetica odontologica acta
15 , 94
5.
Gibbons
R J
Nygaard
M
, (1970 ) Archives of Oral Biology
15 , 1397
6.
Murphy
T R
, (1964 ) British Dental Journal
116 , 483
7.
Poole
D F G
Newman
H N
, (1971a ) Journal of Dental Research
50 , 1175
8.
Poole
D F G
Newman
H N
, (1971b ) Nature (London)
234 , 329
