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WATSON, R. M. Masticatory ability-cineradiographic obser- vations, J. Dent., 1 (1972), 54. ABSTRACT Mast+tory ability may be assessed by analysis of cineradiographic film displaying the pattern of food placement during chewing. Examination was made of subjects in three groups: with intact arches, with defective aiches with few teeth missing, and with arches having only anterior teeth in occlusion. The value of partial dentures which restored the defective occlusions was assessed by comparing the positions of the food bolus in the arch before

and after fitting dentures. Patterns for intact arches showed almost continuous use of the cheek teeth associated with bilateral mastication. REFERENCES

Ardran. G. M.. and Kemp, F. H. (1960). Dent. fractnr dent. Rec., 9, 23.

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BROWN, I. D. An unusual cauae of increased tooth mobility

by themselves but always in conjunction with orthodontic appliances,

during orthodontic treatment, J. Dent., 1 Case 2 shows that even if such a recommendation (1972), 61. ABSTRACT

is acted upon then errors by the patient can still lead to disaster.

Elastic bands are commonly used in orthodontics REFERENCES to move teeth. Two cases are presented illustrating the danger arising when these elastics are able to

Birch, C., and Snyder, F. (1939). J. Am. dent. Ass dent. Cosmos, 26,1933.

slip around the crown into the gingival sulcus. Case 1 suggests that elastics should never be used

Kwapis. B. N., and Knox, J. E. (I 972), Ibid., 84, 629 Vandersall, D. C. (197l),/bid., 63, 1326.

BERTENSHAW, B. W.. and COMBE, E. C. Studies on polycarboxylates and related cements, J. Dent., 1 (1972). 65. ABSTRACT Ten polycarboxylate cement powders have been analysed for their maior constituents and have been classified into four -main categories. Zinc oxide appears to be the principal component of all the powders. Some contain magnesium oxide up to about 10 per cent. One material contains alumina,

and three of the powders contain polyacrylic acid. REFERENCES Bertenshaw, B. W., and Combe, E. C. (1972).

J. Dent., 1, 13. Christian, G. D., and Feldman, F. J. (1970).

Atomic Absorption Spectroscopy: Applications in Agriculture, Biology, and Medicine. Chichester : Wiley-Interscience.

Schwarzenbach. G. (1957). Complexometric Titra- tions. London : Methuen.

BLAIR, G. S., and CHALMERS.1. M. Radiology of the temporomandibular joint, J. Dent., 1 (1972). 69. ABSTRACT Circular tomography of the temporomandibular joint is compared with two established techniques,

REFERENCES Blair, G. S., Chalmers, I. M., Leggat, T. G., and

Buchanan, W. W. (1972). Ora/Surg., in the press, Lundberg, M.. and Ericson, S. (1967). Acta derm.-

vener.. Stockh.. 47. 354. orthopantomography and lateral transcranio- oblique radiography. A high degree of concordance

Madsen; B. (1966). Acte radio/ (diagn.), Stockh., 4. 273.

is demonstrated in the delineation of features of the joint, and circular tomography produces fewer

Nevakari. K. (1959). Suom. Hammas/&+kSeur.

radiographs than do the other two techniques in Toim.. 55. 32.

which these features are obscured. Circular Paatero. Y. V. (1959), Ann/s Med. intern. Fenn.,

tomography appears to be the best technique avail- 48. suppl. 28, 222.

able at the present time for the study of the temporo- Smith, N. J. D., and Harris, M. (1970), Br dent. J.,

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HARRISON. A. Alveolar bone resorption in two edentulous populations, J. Dent., 1 (1972). 77. ABSTRACT Two surveys of elderly persons have been carried out in an attempt to relate the age of the individuals when their teeth were extracted to the amount of alveolar bone remaining. Denture-wearing habits and the number of dentures worn are also taken into consideration. There is little evidence of any associations between the condition of the ridges and the factors examined. REFERENCES Atwood, D. A. (1963). J. prosth. Dent., 13, 810. Bates, J. F., and Murphy, W. M. (1968). 81. dent. J.,

124, 116.

Hobson, W., and Roseman, C. (19531, Ibid.. 94. 208.

Jackson, D. (1965),lbid., 118. 158. Johnson, K. (1963). Amt. dent. J., 8, 428. - - (1964). Ibid., 8, 6, 127, 312. Lam, R. V. (1960). J. prosth. Dent., 10, 25. Pietrokovski, J., and Massler, M. (1967). /bid., 17.

21. Richards, N. D.. Wilcocks, A. J., Bulman.

J. S., and Slack, G. L. (1965), 51. dent. J., 118., 199.

Swallow, J. N., and Adams, 0. (1967). /bid., 123, 137.

Tallgren, A. (1957). Acta odont. stand., 15, Suppl 74 __.

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McGIMPSEY, J. G. An unusual complication while using a Fergusson’s mouth gag, J. Dent., 1 (1972), 83. ABSTRACT An unfortunate complication following the use of a Fergusson’s mouth gag under general anaesthesia is described and its cause discussed.

JONES, D. W., JONES, P. A., and WILSON, H. J. The relationship between transverse strength and testing methods for dental ceramics, J. Dent., I (1972). 85.

ABSTRACT Various factors which affect the strength of dental porcelain have been investigated. The variables studied include rate of loading, heat treatment, firing temperature, vacuum firing, specimen size, and span-to-depth ratio.

REFERENCES Binns, D. B. (1965). J. Br. ceram. Sot., 2, 294. Jones. D. W. (1970). Ph.D. Thesis, University of

Birmingham. - - Jones, P. A., and Wilson, H. J. (1972). Dent

Practnr dent. Rec., 22, 170.

Jones, P. A., Wilson, H. J., and Osborne, J. (1970), Br. dent J., 128, 565.

McLean, J. W. (1967). J. Am. dent. Ass. dent. Cosmos, 75. 657.

Milligan, L. H. (1953). J. Am. ceram. Sot., 36,159. Pulubovarinov. D. N.. and Volosevich. G. W. (19561.

Trudr mosk. khim.-tekhnl. inst.. 2;. 85. ’ ~I’ Ritter,J. E.. and Cooper, A. R. (1963). Physics. Chem.

Glasses, 4. 76. Sartori, J. C. (1939), NWest. Univ. Bull. dent. Res.

Grad. Stud.. 39, 8. SchBnborn. H. (1953). Silikatfechnik. 4. 531. Shevlin, T. S.,‘ and’ Lindenthal, J. W. (1959).

Ceramic Boll.. 38. 491. Skues, L. P. (1938). Undergraduate Thesis, North

Western University Dental School. Wilson, H. J.. and Whitehead, I. (1967), Dent.

Practnr dent. Rec., 17, 350.

COMBE, E. C. Further studies on radio-opaque denture- base materials, J. Dent., 1 (1972), 93. ABSTRACT The effects of the addition of a number of radio- opaque inorganic salts to poly(methyl methacrylate) have been investigated. Of the additives tested, barium fluride appears to be the additive of choice; it can be incorporated into acrylic to form a denture- base material which meets specification require- ments, and which is aesthetically superior to commercial products containing barium sulphate. REFERENCES Beech, D. R., and Combe, E. C. (1971). J. dent.

Res., 50,1192.

Braden, M. (1964), J. prosth. Dent, 14,307. Bursey. D. C., and Webb, J. J. (1960). U.S. arm.

Forces med. J., 11, 561. Chandler, H. H., Bowen, R. L., and Paffen-

barger. G. C. (1971), J. Biomed. Mater. Res., 5, 245.

Combe. E. C. (1969). 81. dent. J.. 127, 355. - - (1971). Dent. Pracrnr dent. Rec., 22, 51, Elzav. R. P.. Pearson, G. 0.. and Irish, E. F. (1971).

J. prosth. Dent., 25. 251. Holden, M. H. (1968). Dent Pracactnr dent. Rec.. 18,

209. Stafford, G. D.. and MacCulloch, W. T. (1971).

Br. dent. J., 131, 22.