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Biomedical subjects

Casimir Leknius

Publications and source records attributed to Casimir Leknius.

7 recordsLinked to original sources
PubMed2005

Dimensional accuracy of 7 die materials.

PURPOSE: The purpose of this study was to compare the linear dimensional accuracy and the handling characteristics of 7 die materials. MATERIALS AND METHODS: A master die analogous to a complete veneer crown preparation was machined from medical grade stainless steel, and 3 measurements (1: vertical; 2 and 3: horizontal) were made from 3 scribed reference lines. Individual polyvinylsiloxane impressions were made (n = 10) for each of the specimens. The fabricated dies were measured (50x) to the nearest 0.0001 mm. Data were subject to ANOVA/Duncan tests at significance level 0.05 and pairwise comparisons. RESULTS: Type IV resin-impregnated dental stone and copper-plated dies most closely approximated the dimensions of the master die, and were not significantly different from each other in any of the pairwise comparisons. Conventional Types IV and V dental stone dies exhibited setting expansion within the range appropriate for gypsum. Epoxy resin die materials demonstrated shrinkage comparable to the expansion of the Types IV and V dies. Polyurethane dies displayed a combination of linear expansion and shrinkage. Bis-acryl composite resin dies had excessive shrinkage. CONCLUSIONS: Type IV resin-impregnated dental stone and copper-plated dies were more dimensionally accurate than the other die materials tested.

Calcium Sulfate↗
PubMed2002

Simplified clinical procedure for fitting and removing inlays/onlays prior to cementation.

This article describes a procedure in which polytetrafluoroethylene (PTFE) tape is used as a liner for fitting intracoronally retained, indirect restorations. The minimal thickness of the tape allows complete seating and confirmation of marginal fit of restorations during try-in, yet the tape is tough enough to permit trouble-free removal of the restoration afterward. Protection against inadvertent loss of the restoration can be gained if a knot is placed close to the occlusal surface of the restoration prior to its removal.

Cementation↗