Quantitative analysis of the selective pressure impression technique using CAD-CAM technology: A pilot clinical study

Area of Science:

• Prosthodontics
• Dental Materials
• Digital Dentistry

Background:

• Quantitative 3D clinical analysis of selective pressure impression technique is limited.
• Direct measurement of tissue displacement during complete maxillary denture impressions is lacking.

Purpose of the Study:

• To digitally compare impressions of the edentulous maxillary ridge using the selective pressure technique.
• To evaluate the impact of varying custom tray relief amounts on impression topography.

Main Methods:

• Nine participants received complete maxillary dentures.
• Custom trays with 0.0-mm, 1.0-mm, and 3.0-mm relief were 3D printed.
• Definitive impressions were made, scanned, and superimposed for topographical analysis.

Main Results:

• No significant topographical differences were found among impression groups with varying relief.
• Mean volumetric differences were minimal across all relief groups.
• Less tissue compression was observed with relief trays compared to the control.

Conclusions:

• Custom tray relief of 1.0 mm and 3.0 mm did not significantly impact impression topography.
• The findings suggest relief may reduce tissue compression without altering the final impression.
• Further research could explore optimal relief strategies for complete dentures.