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Updated: May 22, 2026
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Measuring the Complete-arch Distortion of an Optical Dental Impression
Published on: May 30, 2019
[Study of the appearance difference of lower complete denture between functional and anatomic impression techniques]
Qun Zhong1, Xue-yin Wu, Qing-yi Shen
1Department of Prosthodontics, Shanghai Stomatological Disease Center, Shanghai, China. zhongqun681115@yahoo.com.cn
Summary
The functional impression technique for complete dentures resulted in significant differences in the oblique ridges compared to the anatomic impression technique. This may explain reduced patient tenderness and highlights the need for buffering in these areas.
Area of Science:
- Dentistry
- Prosthodontics
- Biomaterials Science
Background:
- Complete dentures are crucial for restoring function and aesthetics in edentulous patients.
- Impression techniques significantly influence denture base adaptation and patient comfort.
- Understanding the anatomical landmarks, such as oblique ridges, is vital for successful denture fabrication.
Purpose of the Study:
- To compare the dimensional accuracy of lower complete denture bases fabricated using functional versus anatomic impression techniques.
- To analyze differences in the oblique external ridge, oblique internal ridge, and alveolar process crest between the two impression methods.
Main Methods:
- A comparative study involving 15 patients receiving complete dentures fabricated with both functional and anatomic impression techniques.
- Three-dimensional (3D) laser scanning was employed to capture the surface geometry of the denture bases.
- Statistical analysis using a paired t-test was performed to compare structural differences in key anatomical areas.
Main Results:
- Significant differences (P<0.01) were observed in the external and internal oblique ridges between the functional and anatomic impression techniques.
- No significant differences (P>0.05) were found in the primary support areas of the alveolar process crest.
- The functional impression technique demonstrated distinct surface structural variations in the oblique ridges.
Conclusions:
- The observed differences in oblique ridges between techniques correlate with reduced patient tenderness when using the functional impression method.
- Findings suggest the necessity of incorporating adequate buffering in the external and internal oblique ridge areas during clinical denture fabrication.
- The study provides insights into optimizing complete denture design for enhanced patient comfort and adaptation.
