Related Experiment Videos
Sectional impressions for mandibular distal extension removable partial dentures
H A el-Sheikh1, A M Abdel-Hakim
1Department of Prosthetic Dental Science, College of Dentistry, King Saud University, Riyadh, Saudi Arabia.
The Journal of Prosthetic Dentistry
|August 26, 1998
Summary
Full arch impressions effectively capture support for removable partial dentures, reducing denture base movement during biting. Sectional relining impressions offer minimal improvement, questioning their routine use in distal-extension cases.
Area of Science:
- Dentistry
- Prosthodontics
- Biomaterials
Background:
- Corrected impression techniques are crucial for optimal support in removable partial dentures but are often complex.
- Edentulous ridges require precise impression methods for effective denture base support.
- Distal extension removable partial dentures present unique challenges for achieving stable support.
Purpose of the Study:
- To evaluate the vertical movement of mandibular distal extension removable partial denture bases during biting.
- To compare the efficacy of full arch impressions versus sectional relining impressions in minimizing denture base movement.
- To determine the clinical significance of reduced vertical movement achieved with sectional impressions.
Main Methods:
- Five patients with distal extension removable partial dentures participated in the study.
- Vertical denture base movement was measured using plaster interocclusal records at rest and under biting pressure.
- Denture bases were initially fabricated from full arch custom tray impressions and subsequently relined using sectional impressions.
Main Results:
- A statistically significant decrease in vertical denture base movement was observed with sectional impressions.
- The reduction in vertical movement was less than 0.1 mm, indicating a minimal clinical difference.
- Full arch impressions in custom trays successfully recorded the supportive form of distal-extension edentulous ridges.
Conclusions:
- Full arch impressions in custom trays are adequate for recording the supportive form of distal-extension edentulous ridges.
- The routine use of sectional impressions for all distal-extension mandibular removable partial dentures may not be necessary due to minimal benefits.
- Optimizing impression techniques remains key to enhancing support and stability in removable partial dentures.