Journal of Dentistry, 5, No. 3, 1977, pp. 267-268. Printedin Great Britain 267 JOURNAL OF DENTISTRY Abstracts from this issue BATES J. F., STAFFORD G. D., HUGGETT FL and HANDLEY R. W. Current status of pour type denture base resins, J. Dent. 5 (1977) 177-189. An investigation of eight currently available pour type denture base resins has been carried out. The constituents of each material and the physical and mechanical properties were examined and compared with those of a conventional heat-cured denture base resin. Finally, an assessmentof the laboratory procedures involved, with particular attention being paid to the time required for denture construction, was undertaken. VAN WY K C. W., STAZ J. and FARMAN A. G. The chewing lesion of the cheeks and lips: its features and prevalence among a selected group of adolescents, J. Dent 5 (1977) 193-199. A survey among certain population groups in the Cape Province of South Africa revealed 60 chewing lesions of the cheeks and lips. All but 2 of these were found in pupils from reform schools. In these pupils there were 49 lesions among 1998 males and 9 among 157 females. No similar lesions were found in a comparaMe group of 555 non-institutionalized children. This differ- ence in prevalence was significant at the 5 per cent level. The affected mucosa had a grey-white pitted appearance and could be rubbed off partially. The lesional epithelium was acanthotic with a superficial frayed and necrotic cellular layer. Electron micro- scopic examination showed a pronounced clustering of organisms on the surfaces of the necrotic superfical cells. WATKINS J. J. and TUCKER G. J. An unusual form of impaction of two permanent molars: a case report, ./. Dent 5 (1977) 215-218. A case of horizontally impacted lower first and second permanent molars is described. Such a case does not appear to have been previously recorded in the literature. MARENTIS C. and BRADFORD E. W. The adaptation of composite resin restur- ations to etched dentine, J. Dent. 5 (1977) 296-296. Cavities made in extracted human molars were filled with a composite resin with and without a bonding agent. The interface of the dentine and restoration was examined with a scanning electron microscope to determine the differences between the two types of restoration. The findings were similar for both groups, but there were differences between areas of the restorations which did and did not show leakage of a tracer dye. The possible causes of these differences are discussed. HILL F. J. and SOETOPO A simplified acid+tch technique for the restoration of fractured incisors, J. Dent 5 (1977) 207-212. An acid-etch technique which has been clinically tested on 76 fractured incisors in 53 patients for up to 3 years is described. Although considerably simpler than others which have been evaluated, the technique produced a similar high retention rate of over 90 per cent even though severely fractured teeth were included in the trial. No pulpal or gingival reactions attributable to the restorations were observed. ROOD J. P. The temperature of local anaesthetic solutions,J. Dent 5 (1977) 213-214. The perception of the temperature of local anaesthetic solutions by patients was examined. Extremes of temperature were correctly identified but there was a lack of sensation of temperature in the intermediate range. It is concluded that the temperature of local anaesthetic solutions should prefer- ably be between 20 and 35 “C. WOOD G. D. and FANIBUNDA K. A method for reclaiming amalgam from extracted teeth, J. Dent. 5 (1977) 190-192. An investigation has been undertaken to test the suitability of hydrochloric acid as a means of reclaiming amalgam from extracted teeth.

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Page 1: Current status of pour type denture base resins,

Journal of Dentistry, 5, No. 3, 1977, pp. 267-268. Printedin Great Britain 267

JOURNAL OF DENTISTRY Abstracts from this issue

BATES J. F., STAFFORD G. D., HUGGETT FL and HANDLEY R. W. Current status of pour type denture base resins, J. Dent. 5 (1977) 177-189. An investigation of eight currently available pour type denture base resins has been carried out. The constituents of each material and the physical and mechanical properties were examined and compared with those of a conventional heat-cured denture base resin. Finally, an assessment of the laboratory procedures involved, with particular attention being paid to the time required for denture construction, was undertaken.

VAN WY K C. W., STAZ J. and FARMAN A. G. The chewing lesion of the cheeks and lips: its features and prevalence among a selected group of adolescents, J. Dent 5 (1977) 193-199. A survey among certain population groups in the Cape Province of South Africa revealed 60 chewing lesions of the cheeks and lips. All but 2 of these were found in pupils from reform schools. In these pupils there were 49 lesions among 1998 males and 9 among 157 females. No similar lesions were found in a comparaMe group of 555 non-institutionalized children. This differ- ence in prevalence was significant at the 5 per cent level. The affected mucosa had a grey-white pitted appearance and could be rubbed off partially. The lesional epithelium was acanthotic with a superficial frayed and necrotic cellular layer. Electron micro- scopic examination showed a pronounced clustering of organisms on the surfaces of the necrotic superfical cells.

WATKINS J. J. and TUCKER G. J. An unusual form of impaction of two permanent molars: a case report, ./. Dent 5 (1977) 215-218. A case of horizontally impacted lower first and second permanent molars is described. Such a case does not appear to have been previously recorded in the literature.

MARENTIS C. and BRADFORD E. W. The adaptation of composite resin restur- ations to etched dentine, J. Dent. 5 (1977) 296-296. Cavities made in extracted human molars were filled with a composite resin with and without a bonding agent. The interface of the dentine and restoration was examined with a scanning electron microscope to determine the differences between the two types of restoration. The findings were similar for both groups, but there were differences between areas of the restorations which did and did not show leakage of a tracer dye. The possible causes of these differences are discussed.

HILL F. J. and SOETOPO A simplified acid+tch technique for the restoration of fractured incisors, J. Dent 5 (1977) 207-212. An acid-etch technique which has been clinically tested on 76 fractured incisors in 53 patients for up to 3 years is described. Although considerably simpler than others which have been evaluated, the technique produced a similar high retention rate of over 90 per cent even though severely fractured teeth were included in the trial. No pulpal or gingival reactions attributable to the restorations were observed.

ROOD J. P. The temperature of local anaesthetic solutions,J. Dent 5 (1977) 213-214. The perception of the temperature of local anaesthetic solutions by patients was examined. Extremes of temperature were correctly identified but there was a lack of sensation of temperature in the intermediate range. It is concluded that the temperature of local anaesthetic solutions should prefer- ably be between 20 and 35 “C.

WOOD G. D. and FANIBUNDA K. A method for reclaiming amalgam from extracted teeth, J. Dent. 5 (1977) 190-192. An investigation has been undertaken to test the suitability of hydrochloric acid as a means of reclaiming amalgam from extracted teeth.