A lower fixed ‘tongue crib’ was used diagnostically in a case of bimaxillary protrusion. The anterior open bite and lower incisor spacing resolved under the influence of soft tissue action. Lip exercises were instituted to create a new muscle balance and thus maintain the new incisor positions. The literature is reviewed in relation to tongue cribs, lower incisor position and lip tone. The fundamental interest in the case presented is the support it provides for the ‘balance’ theory of lower incisor position.
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References
1.
BallardC. F. (1957) The aetiology of malocclusion: an assessment, Dental Practitioner, 8, 42–50.
2.
BondyH. E. and HunterW. S. (1969) Tongue volume and the mandibular dentition, American Journal of Orthodontics, 56, 134–142.
3.
FogelB. (1974) Therapy can curb tongue thrust swallowing in “News of Dentistry”Journal of the American Dental Association, 89, 1038–45.
4.
FrielE. S. (1926) An investigation into the relation of function and form, British Dental Journal, 47, 353–379.
5.
GouldM. S. E. and PictonD. C. A. (1964) A study of pressures exerted by the lips and cheeks on the teeth of subjects with normal occlusions, Archives of Oral Biology, 9, 469–478.
6.
GraberT. M. (1972) Orthodontics, Principles and Practice, p. 687, Philadelphia: W. B. Saunders and Co.
7.
JacobsR. M. and BrodieA. G. (1966) The analysis of perioral muscular accommodation in young subjects with malocclusion, Angle Orthodontist, 36, 325–334.
8.
KyddW. L. (1957) Maximum forces exerted on the dentition by the perioral and lingual musculature, Journal of the American Dental Association, 55, 646–651.
9.
LearC. S. C. and MoorreesC. F. A. (1969) Buccolingual muscle force and dental arch form, American Journal of Orthodontics, 56, 379–393.
10.
MossM. L. and SalentinL. (1969) The primary role of functional matrices in facial growth, American Journal of Orthodontics, 55, 566–577.
11.
PascualA. (1975) Taking therapeutic advantage of function and tongue position in Class III malocclusions, Transactions of the European Orthodontics Society, 24, 241–250.
12.
PosenA. L. (1972) The influence of maximum perioral and tongue force on incisor teeth, Angle Orthodontist, 42, 285–309.
13.
ProffitW. R., and MasonR. M. (1975) Myofunctional therapy for tongue thrusting: background and recommendations, Journal of the American Dental Association, 90, 403–411.
14.
ProffitW. R., McGloneR. E. and BarrettM. J. (1975) Lip and tongue pressures related to dental arch and oral cavity size in Australian aborigines, Journal of Dental Research, 54, 1161–72.
15.
RenfroeE. W. (1975) Edgewise, p. 220, Philadelphia: Lea and Febiger.
16.
RosenthalM. (1974) Myofunctional therapy: when to use it, and how, Dental Survey, 50, 22–26.
17.
SchwarzA. M. and GratzingerM. (1966) Removable Orthodontic Applicances, p. 307–8, Philadelphia: W. B. Saunders and Co.
18.
ScottJ. H. (1961) The role of soft tissues in determining normal and abnormal dental occlusion, Dental Practitioner and Dental Record, 11, 302–308.
19.
ScottJ. H. (1967) Dentofacial Development and Growth, p. 166, Oxford: Pergamon Press Ltd.
20.
SimsF. W. (1958) The pressure exerted on the maxillary and mandibular central incisors by the perioral and lingual musculature in acceptable occlusion, American Journal of Orthodontics, 445, 64.
21.
StraubW. J. (1960) Malfunction of the tongue: part 1. The abnormal swallowing habit: its cause effects and results in relation to orthodontic treatment and speech therapy, American Journal of Orthodontics, 46, 404.
22.
TomesC. S. (1873) The bearing of the development of the jaws on irregularities, Dental Cosmos, 15, 292–296.
23.
TulleyW. J. (1956) Adverse muscle forces: their diagnostic significance, American Journal of Orthodontics, 42, 801–814.
24.
TulleyW. J. and CampbellA. C. (1970) A Manual of Practical Orthodontics, 3rd Edition, Bristol: John Wright
25.
WallenT. R. (1974) Vertically directed forces and malocclusion: a new approach, Journal of Dental Research, 53, 1015.
