To ensure optimal retention, stability, and proper occlusion in denture designs, high-quality impressions are essential. Accurate impressions lead to a final prosthesis that offers long-term comfort and functionality for patients.
Maxillary Impression Requirements
For maxillary dentures, the impression must accurately capture the entire denture-bearing area, including:
- Palate: Ensures a proper seal and fit.
- Alveolar Ridges: Critical for denture support.
- Hamular Notches: Key for secure retention and avoiding movement.
In addition, the following areas must be clearly defined:
- Buccal and Labial Vestibules: Guide proper denture extension.
- Frenum Attachments: Ensure that the denture does not impinge on soft tissues.
- Posterior Palatal Seal Area: Important for enhancing suction and overall retention.
Mandibular Impression Requirements
The mandibular impression must capture:
- Full Arch: Covers all essential support areas.
- Retromolar Pads: Ensures posterior retention and stability.
- Buccal and Labial Vestibules: Key for extending the denture properly.
- Frenum Attachments: To avoid soft tissue irritation.
- Oblique Ridge and Lingual Mylohyoid Ridge: Necessary for stability and retention in the lingual and posterior regions.
Scan Requirements and Best Practices
- IOS Scanning with Retractors: Clinicians must use intraoral scanners (IOS) with nonmetallic edentulous retractors to reduce interference from the tongue and surrounding muscles.
- Complete Anatomical Capture: Ensure that all relevant anatomical landmarks are captured. Incomplete scans or scans with artifacts may result in a nonfunctional denture.
IOS Scan using retractors
All Anatomical Landmarks
Ready to Design
Note:
Incomplete scans or those with artifacts result in nonfunctional dentures, as our system often cannot process them. Using these scans for monoblock try-ins only worsens the issue, as they typically fail to meet the minimum requirements for a custom tray for wash impressions.
Suggested Solutions
- Trios Scanners: These scanners, with their advanced memory and camera capabilities, are ideal for capturing edentulous oral cavities.
- Nonmetallic IOS Retractors: Minimize soft tissue and tongue interference, allowing for clearer scans of all anatomical landmarks.