PubMed · 4518576
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J R Schmidt, H Ehrenkranz, S E Mohamed, M E Franklin. 1973. A single visit post and core procedure.. https://pubmed.ncbi.nlm.nih.gov/4518576/
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This study determined the retentive values of various size sleeves and their corresponding post heads when these were cemented with zinc phosphate cement. The experiment was divided into four groups of 10 samples each, except for group 3, which had eight samples. In each instance, the retentive values (measured in pounds) were obtained using a universal testing machine. In all samples studied, the retention of the sleeve was greater than 110 pounds. As the post number increased from 0 to 3, there was a corresponding increase in the retentive force needed to dislodge each sleeve. A maximum of 170.5 pounds was found for the No.3 cast-post sample. Comparison shows that the retention of the sleeve (for this cast-post system) onto the post head is in the same range as crown-to-tooth retention values shown by other investigators.
This study was done to determine the efficacy of rapidly mixing zinc phosphate cement in conjunction with fixed prosthodontic procedures. Properties measured included rate of pH change and temperature increase, film thickness, and setting time. The rapid mix technique in conjunction with the frozen glass slab resulted in a faster elevation of the pH but slightly greater temperature rise and film thickness. As was expected, the rapid mixing procedure resulted in an increased working time but decreased setting. On the basis of this study, it appears that the rapid mixing technique in conjunction with a frozen glass slab is an acceptable technique for preparing zinc phosphate cement for fixed prosthodontic procedures.