3D-Printed Implant Overdentures: Comparing Impression Techniques
Impact of Impression Techniques on Patient Satisfaction and Chewing Efficiency in 3D-Printed Implant Overdentures: A Crossover Study
Mansoura University
16 participants
Jan 6, 2026
INTERVENTIONAL
Conditions
Summary
This randomized crossover clinical trial aims to compare three different impression techniques for the construction of 3d-printed mandibular implant overdentures in completely edentulous patients. Sixteen patients will receive two mandibular implants and three overdentures fabricated using:(1) conventional open-tray implant level impression (2) functionally generated reline impression, and (3)mucostatic base with functional borders impression. Each overdenture will be worn for three months with a washout period between interventions. The primary outcome is masticatory efficiency, assessed using a color -mixing ability test at 3,6, and9 months. Secondary outcome is patient satisfaction, assessed using a Visual Analog Scale (VAS) at the same intervals. the study hypothesis is that the impression technique influences both chewing efficiency and patient satisfaction
Eligibility
Inclusion Criteria4
- Healthy patients, free from systemic diseases that affect bone resorption (e.g., uncontrolled diabetes, osteoporosis)
- Residual alveolar ridges covered with healthy, firm mucosa
- Adequate mandibular bone length and width to accommodate standard implant sizes.
- Angle's Class I maxillo-mandibular relationship.
Exclusion Criteria6
- Absolute contraindications to implant placement (e.g., active cancer, immune system diseases)
- History of head and neck irradiation or chemotherapy within the past 3 years
- Metabolic bone diseases such as uncontrolled diabetes, osteoporosis, or hyperparathyroidism
- Parafunctional habits such as bruxism or clenching
- Smoking or alcoholism
- Any physical or medical condition that may interfere with study follow-up or implant success
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Interventions
Primary impression with irreversible hydrocolloid, custom tray with open window, and final impression with silicone material around impression copings to fabricate a 3D-printed implant overdenture
Interim prosthesis relieved and reline impression taken during centric closure with border molding, scanned to construct a 3D-printed implant overdenture
Intraoral scan of edentulous arch, 3D-printed baseplates for occlusion rim, functional border molding, and digital workflow to fabricate 3D-printed implant overdenture
Locations(1)
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NCT07208812