IN-VITRO STUDY OF DIMENSION DIE STABILITY FOR LONG FIXED PROSTHESIS TAKEN BY PERFORATED METAL STOCK TRAYS AND SELF-CURING ACRYLIC TRAYS
Introduction: taking fixed partial denture impressions, silicon is better by adding dimension stability and a higher detail reproduction. Trays are required; they may be perforated metal stock or self-curing acrylic. Materials and
methods: we performed an experimental, comparative in-vitro study by sampling 10 plaster models got from ten impressions taken using five perforated metal stock trays and five self-curing acrylic trays, all of them made by stainless steel model simulating the lower jaw. Measuring plaster models and the stainless steel model was performed by a single operator through a stereoscope Nikon model CPs 160, Series 1005941. First, we calibrated the stainless steel model by measuring height and diameter of abutment teeth canines 33-43, first molars 36-46, the interpillar distance between 33-43 and 43-46. Then plaster models were measured and results compared using descriptive summary measures and averages based on Mann-Whitney test.
Results: none of the measurements taken on models based on both basin types revealed a statistically significant difference p > 0.5.
Conclusions: no statistically significant difference by taking impressions with perforated metal stock trays or self-curing acrylic trays.
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