Comparative study of dimensional accuracy of different impression techniques using addition silicone impression...

Area of Science:

• Dentistry
• Dental Materials Science

Background:

• Accurate dental impressions are crucial for fabricating well-fitting restorations.
• Addition silicone is a widely used impression material, but technique variations can affect dimensional accuracy.

Purpose of the Study:

• To compare the dimensional accuracy of four different impression techniques using addition silicone material.
• To identify the most accurate technique for full-crown preparations.

Main Methods:

• Four impression techniques were evaluated: single, double with spacer, double with cut-out, and double mix.
• A typhodont model with Ivorine teeth served as the master model.
• Stone dies were poured from impressions made using each technique.
• Dimensional accuracy was assessed by measuring height, width, and diameter on the stone dies.

Main Results:

• Most measurements showed slight decreases in dimension compared to the master model; some increased.
• The double with cut-out and double mix techniques exhibited the least dimensional differences.
• These techniques were more accurate than the single and double with spacer methods.

Conclusions:

• The double with cut-out and double mix impression techniques provide superior dimensional accuracy with addition silicone.
• These techniques are recommended for achieving precise dental impressions, particularly for full-crown preparations.