Biomedical subjects

R Pinkert

Publications and source records attributed to R Pinkert.

31 records · Page 2Linked to original sources

PubMed1975

[Stable osteosynthesis in mandibular fractures using cold polymerizing polymethylmethacrylate "Kallocryl-K"].

The author describes a method for the stable osteosynthesis of mandibular fractures. Prefabricated cups of cold-curing poly(methylmethacrylate) were fixed to the fragments by means of freshly mixed methacrylate, which produced their stable union for the period of healing. Uneventful healing was confirmed by clinical and radiological examinations. Side-effects on the cardiovascular system which may be caused by the residual monomer were not observed.

Fracture Fixation↗

PubMed1975

[Histological studies on the healing of mandibular osteotomies in the dog following stable osteosynthesis with the cold polymerizing polymethylmethacrylate "Kallokryl K"].

The disadvantages of methods of accomplishing stable osteosynthesis of mandibular fractures are described and the possibilities of jacketing the fragments with Kallokryl K plastic material, which is a cold-polymerizing polymethyl methacrylate, pointed out. After six months from the surgical operation, the healing under Kallokryl K was clinically and histologically evaluated on canine mandibles subjected to osteotomy and with the periosteum removed from the lower jaw bone. The reaction of both soft tissue and bone to the plastic material attached thereto was also evaluated. The results are discussed in the light of what is presently known about primary and secondary bone healing.

Animals↗

PubMed1975

[Characterization and determination of residual monomer content of implantation materials from polymethacrylic acid methylester].

Cold polymerizates "Kallocryl K" and "Palacos" were characterized by means of physico-chemical methods of examination. The residual monomer content of the polymerizates, which is of major toxicological interest, was also determined quantitatively. It was possible to show that the residual monomer content decreases exponentially as a function of the duration of polymerization. "Palacos" polymerizates had much higher residual monomer contents than "Kallocryl K" polymerizates when the same time of polymerization was used. Also discussed in this paper are possible methods of reducing the residual monomer content prior to implantation of the plastic materials.

Dental Implantation↗

PubMed1975

[Studies on the diffusion of the remaining monomers from implantation plastics of polymethacylic acid methylester].

Positive clinical results were obtained using implanted cold polymerizates, and these were compared with the negative results of experiments made on animals. The observed local pathophysiological processes are considered to be due to the effects produced by the methacrylic methyl ester. The absolute content of residual monomers in the implants does not allow to make any definite conclusions as to the rate of diffusion into the organism. Therefore, the diffusion of residual monomers into an aqueous medium was titrimetrically measured for three weeks by the pyridine sulfate dibromide method. After a description of the method of titration and the results obtained, a discussion is given of the causes of the different rates of diffusion of residual monomers from Kallokryl K and Palacos samples, which are dependent upon the duration of polymerization in air.

Acrylic Resins↗

PubMed1974