Microleakage of selected composite restorative resins

Journal of Dentistry,

10, No. 4. 1982,

JOURNAL

OF DENTISTRY

Abstracts

from

this

pp. 355-356

Printedin

Great Britain

issue

MORADIANS S., FLETCHER A. M., AMIN W. M., RITCHIE G. M., PURNAVEJA J. and DODD A. W. Some mechanical proPerties including the repair strength of two self-curing acrylic resins. .I. Dent. 10 (1982) 271-280. Selfcuring acrylic resins have been used mainly in prosthetic dentistry for the construction of custom-built impression trays, occlusion registration bases and for repairing fractured dentures. Their disadvantages when compared with heatcured resins are their relatively poor mechanical properties and a high level of residual monomer. Recently, pour-type resins have been introduced for the fabrication of denture bases. The present study was to examine some of the undertaken mechanical properties of these materials and compare the results with those previously reported.

STEELE L. The delivery of dental care for elderly handicapped patients. J. Dem. 10 (1982) 281-288. There are thrae basic modes of delivering dental care to elderly handicapped patients: 1. As outpatients requiring transport. Treated by general dental practitioners, the community dental service or as hospital outpatients. 2. In a simple clinic within an institution. 3. Domiciliary treatment including visits by a dentist to unequipped wards or institutions. In many cases, the choice between different modes of delivery depends upon the treatment needed, venue, services, equipment and facilities available, as well as cost and attitudes of those involved. Data from use of all three modes is presented and is related to the physical, medical and mental state of patients and to the factors which contribute to the costeffectiveness of treatment.

BAGNALL R. D., CALLIS P. D. and ROBERTSON W. D. An endodontic method simulating cancellous bone. J. Dent. 10 (1982) 289-291.

A gypsum-filled polymer has been developed for endodontic teaching purposes. The material is radiographically similar to cancellous bone, is strong and rigid at room temperature, yet can be repeatedly softened by heating so that selected teeth may be extracted for examination. Full-arch models with natural teeth are readily cast in the material, and may be useful in the teaching of extraction techniques.

RETIEF D. H., WOODS E. and JAMISON H. C. Microleakage of selected composite raetorative resins. .I. Dent. 10 (1982) 292-299. Five selected composite restorative resins were used to restore Class V preparations in extracted human maxillary canine teeth. In addition, a low-viscosity bonding resin was used in conjunction with one of the restorative resins. Microleakage, at both the incisal and cervical margins of the restorations, was assessed by means of a radioisotope after the restored teeth had been subjected to 2500 cyclic temperature changes at 5” and 55”, respectively. lncisal microleakage was not significantly different but sewre microleakage was recorded at the cervical margins of the restorations.

LITTLE D.A. The relevance of proathodontics and the science of dental materials to the practice of dentistry. J. Dent. 10 (1982) 300-310. This article attempts by historic reference to demonstrate the present and future relewnce of prosthodontics and the science of dental materials to the practice of dentistry. The historical introduction indicates the inadequacy of prosthodontic techniques and materials used in the past, so that an immediate appreciation of modern techniques may be recognized. The relewnce of prosthodontics is discussed from an educational point of view, and the importance of existing techniques is emphasized with regard to the problems of today. The future role of implant materials and prosthodontics is summarized. The significance of dental materials science is discussed with reference to groups