Related Experiment Videos
[Measuring the accuracy of various elastomeric impression materials using a CNC coordinate measuring device (Part 1)]
M Wichmann1, L Borchers, E Limmroth
1Zentrum Zahn-, Mund- und Kieferheilkunde der Medizinischen Hochschule Hannover.
Deutsche Zahnarztliche Zeitschrift
|August 1, 1990
Summary
This study evaluated 23 dental impression materials for accuracy. Two-phase techniques generally yielded smaller stone dies, while single-phase and double-mix methods produced larger dies compared to the master model.
Area of Science:
- Dental Materials Science
- Prosthodontics
Background:
- Accurate dental impressions are crucial for fabricating prosthetics.
- Variations in impression materials can affect the dimensional accuracy of stone dies.
Purpose of the Study:
- To compare the dimensional accuracy of 23 different impression materials.
- To assess the impact of impression techniques on stone die reproduction.
Main Methods:
- Standardized impressions of a stainless steel master die using 23 materials.
- Dimensional analysis of master die and stone dies via CNC coordinate measuring device.
Main Results:
- Dimensional differences in prepared tooth heights ranged from -36 to +19 microns.
- Occlusal distances on stone dies were 2-54 microns larger than the master die.
- Diameters varied by -89 to +52 microns; two-phase impressions resulted in smaller dies, while single/double-mix produced larger dies.
Conclusions:
- Impression material and technique significantly influence stone die accuracy.
- Material selection and technique are critical for achieving precise prosthetic fit.