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At least 829 records · Page 46Linked to original sources
PubMed1989

[Influence of die spacer on the marginal gap of partial crowns].

The effect of die spacer in the fabrication of partial crowns was examined in an in vitro study. Even with good overall expansion of the investment material it is impossible to prevent tight spots in the areas of the box form or clasp retentions. These have to be removed by grinding. Accurate application of die spacer may improve the marginal fit significantly while reducing the amount of grinding necessary.

Crowns↗
PubMed1989

[Dimensional change and deformation on stone dies for full cast crowns. Differences according to impression methods using vinyl silicone impression materials].

In order to reconfirm the efficiency of an individual tooth tray, an apparatus and method were developed for measuring dimensional changes and observing over all deformation on a stone die for a full cast crown. The stone dies, which were made by combination impression methods I, II and double impression (individual tooth tray use) with vinyl silicone impression materials, were measured and compared. The results were as follows: 1. It made no difference what kind of vinyl silicone impression materials were used. 2. As to the dimensional changes: for combination impression method I, irregular results were found for the stone dies with the differences between +1 standard deviation (SD) and -1 SD being large. The variations of the other two methods were quite small, indicating that the stone dies were made accurately. 3. Observing to magnified images with the naked eye, there were no clear differences between the three methods on the marginal parts, but at the top corners of the stone dies there were good results with the double impression method. 4. It was possible to grasp easily the general aspect of dimensional changes in the stone dies using this newly developed measuring method.

Calcium Sulfate↗
PubMed1989

Correlation between the degree of deformation of the stone die and the amount of the master die undercut. Part 1. Single tooth die.

In order to investigate the deformation the stone die depending on the amount of undercut, 5 kinds of undercut master dies were used to take impressions using 3 kinds of impression materials (addition type silicone rubber, polysulfide rubber, alginate). The stone dies were measured for dimensional changes in shape as projected to a two-dimensional plane by means of a newly devised apparatus. The results showed that deformation of the stone dies increased, in general, in proportion to the amount of undercut of the master die. The stone dies obtained from addition type silicone rubber impression material tend to be less deformed. In the case of the polysulfide rubber impression, the deformation was very small in stone dies in the case of non-undercut master dies, but it was very large in the case of undercut master dies. The alginate impression materials gave results with wider variations.

Alginates↗
PubMed1978

[The shape of the ideal arcogrammetric dental arch].

On 48 arcograms of 24 cases with ideal occlusion polynomes of the form y = bo + b1x + b2x2 + b3x3 ... + b8x8 were established by the method of least squares. By means of a stepwise polynomal regression the coefficients up to the 8th degree were tested on significance. Finally polynomes of 4th degree were chosen to describe the anterior dental arch from 6 mesial to mesial 6 of the arcogram. Resulting error expressed as mean of the residuals of values observed--values calculated was 0.08 +/- approximately 0.6 mm (mean +/- 1 SD).

Dental Arch↗