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Three-dimensional analysis of dual-arch impression trays
Monica J Cayouette1, John O Burgess, Robert E Jones
1Medical University of South Carolina, College of Dental Medicine, Department of Prosthodontics, Charleston, South Carolina 29425, USA. cayouetm@musc.edu
Summary
The custom tray technique demonstrated the highest accuracy in dental cast fabrication, showing reproducibility comparable to the master model. Other impression techniques yielded clinically acceptable results but with minor inaccuracies.
Area of Science:
- Dental materials science
- Prosthodontics
- Biomaterials engineering
Background:
- Accurate dental casts are crucial for fabricating well-fitting restorations.
- Evaluating the dimensional accuracy of various impression techniques is essential for clinical success.
- Three-dimensional (3D) measurement offers a precise method for assessing cast accuracy.
Purpose of the Study:
- To compare the dimensional accuracy of dental casts made with four impression tray types and two materials against a master model.
- To utilize 3D measurement for a precise comparison of cast dimensions.
Main Methods:
- Vinyl polysiloxane and polyether impressions were taken of crown preparations on an acrylic master model.
- Specific reference points were marked on preparations, occlusal surfaces, and finish lines.
- Impressions were poured with Type IV dental stone, and casts were analyzed using a 3D measuring system to determine coordinates.
Main Results:
- Analysis of variance (ANOVA) and Dunnett's t test were used to assess accuracy and precision.
- The custom tray technique showed no detectable inaccuracies and high reproducibility, similar to the master model.
- All evaluated impression techniques produced clinically acceptable results.
Conclusions:
- The custom tray technique is the most accurate method for producing dental casts.
- While other techniques showed minor inaccuracies, they remain clinically acceptable for dental restorations.