Accuracy of the One-Stage and Two-Stage Impression Techniques: A Comparative Analysis

Area of Science:

• Dental Materials Science
• Prosthodontics
• Clinical Dentistry

Background:

• Accurate dental impressions are vital for successful indirect restorations.
• Tray selection and preparation are critical steps in the impression process.

Purpose of the Study:

• To compare the accuracy of one-stage and two-stage impression techniques.
• To evaluate the marginal gap in dental models created by different impression methods.

Main Methods:

• Resin laboratory models of first molars were prepared for full crowns.
• Impressions were made 20 times each using one-stage and two-stage techniques.
• Marginal gap was measured using a stereomicroscope in mesial, distal, buccal, and lingual regions.

Main Results:

• The one-stage impression technique resulted in a larger mean marginal gap than the two-stage technique.
• No significant difference was observed in the mid-buccal region.
• Significant differences were found in the mesial, distal, and lingual regions, and overall.

Conclusions:

• The two-stage impression technique offers superior accuracy compared to the one-stage technique.
• This suggests the two-stage method is preferable for achieving precise dental restorations.