The incidence of lower second molar impaction was investigated, comparing the records of two samples of 200 orthodontic patients referred consecutively, in 1976 and 1986. A further study compared 50 cases showing both bilateral and unilateral impactions, with a non-impacted control group. This allowed possible causes of the impactions to be examined, particularly concerning the effect of premature loss of deciduous teeth on the distribution of crowding.
AitsaloK., LehtinenR. and OlsalaE. (1972) An orthopantomographic study of the prevalence of impacted teeth, International Journal of Oral Surgery, 1, 117–120.
2.
BradburyA. S. (1985) A current view on patterns of extraction therapy on British health service orthodontics, British Dental Journal, 159, 47–50.
3.
BuchnerH. J. (1973) Correction of impacted second molars, Angle Orthodontist, 43, 30–33.
4.
DemirjianA. (1978) (In: Faulkner and Tanner (eds), Dentition from Human Growth, Two, Bailliere Tindall, London, pp. 414–444.
5.
DemirjianA., GoldsteinH. and TannerJ. M. (1973) A new system of dental age assessment, Annals of Human Biology, 45, 211–227.
6.
HarradineN. W. T. and StephensC. D. (1988) An examination of the complexity of treatment judged in 1986 to be required for orthodontic patients referred to the Bristol Dental Hospital in 1977 and 1985British Journal of Orthodontics, 15, 0–0.
7.
JohnsonE. and TaylorR. C. (1972) A surgical approach in uprighting impacted second molars, American Journal of Orthodontics, 61, 508–514.
8.
RichardsonM. E. (1981) The development of third molar impaction and its preventionInternational Journal of Oral Surgery, 10, Supplement 1, 122–130.
9.
SidebottomA. (1987) Unpublished thesis based on an examination of 1600 consecutive patients seen at Gloucester and Cheltenham hospitals.
10.
TaitR. V. (1976) Dentistry for children: An objective appraisal Personal Publication.
11.
TaitR. V. (1982) Mesial migration and lower third molar tilt, British Journal of Orthodontics, 9, 41–47.
12.
TailR. V. (1984) Further observations on lower third molar tilt, British Journal of Orthodontic, 11, 200–204.
13.
ToddJ. E. and DoddT. (1985) Children's Dental Health in the United Kingdom, HMSO, 1985
