Comparing three ways to take impressions so lower full-arch implant dentures fit precisely.
Accuracy of Standard vs Geometric Pattern-Assisted Digital Scanning Techniques for Construction of Full Arch Implant Prosthesis Framework: A Crossover Study
This study will try three different impression methods to see which gives the most accurate fit for people with a fully toothless lower jaw supported by four implants.
Quick facts
| Phase | Not applicable |
|---|---|
| Study type | Interventional |
| Enrollment | 4 (estimated) |
| Ages | 30 Years to 70 Years |
| Sex | All |
| Sponsor | Mansoura University Academic / other |
| Locations | 1 site (Al Mansurah, Dakahlia Governorate) |
| Trial ID | NCT07065487 on ClinicalTrials.gov |
What this trial studies
This prospective crossover trial enrolls people with a completely edentulous mandible and four osseointegrated implants to compare three impression techniques for full-arch implant-supported prosthetic frameworks. Each participant will receive conventional splinted polyvinyl siloxane impressions, standard intraoral digital scanning, and geometric pattern-assisted digital scanning in a randomized sequence, producing three digital models per person. Frameworks are designed with CAD/CAM and fabricated by 3D laser sintering, and accuracy is measured by mean three-dimensional deviation between each test scan and a reference scan using digital superimposition software. The crossover design minimizes order bias and allows within-subject comparison of fit passivity across the three methods.
Who should consider this trial
Good fit: Adults aged 30–70 with a completely edentulous lower jaw and four osseointegrated implants who are in good general and oral health and can attend all visits are ideal candidates.
Not a fit: People with medical conditions that affect bone healing, active oral infection or inflammation, a history of bruxism or parafunctional habits, or those without four mandibular implants are unlikely to benefit from the findings.
Why it matters
Potential benefit: If successful, this could improve passive fit of full-arch implant prostheses and reduce the need for adjustments or complications.
How similar studies have performed: Prior work shows digital scanning can be accurate for single implants and short-span restorations, but full-arch scanning remains less proven and geometric reference patterns are a relatively new approach with limited but promising data.
Eligibility criteria
Show full inclusion / exclusion criteria
Inclusion Criteria: Adults aged 30 to 70 years Completely edentulous mandible Presence of four osseointegrated implants in the lower jaw Good oral and general health Willingness to participate and provide written informed consent Availability for all study appointments Exclusion Criteria: Systemic diseases or conditions that affect bone healing or implant integration Presence of oral inflammation, infection, or soft tissue abnormalities at implant sites History of bruxism or parafunctional habits Inability to understand or comply with study procedures
Where this trial is running
Al Mansurah, Dakahlia Governorate
- Mansoura University — Al Mansurah, Dakahlia Governorate, Egypt (Recruiting)
Study contacts
- Study coordinator: Mirna A. Anis
- Email: mirnaashraf01@gmail.com
- Phone: +20502522062
How to participate
- Review the eligibility criteria above with your treating physician.
- Visit the official trial page on ClinicalTrials.gov for the most current contact information and recruitment status.
- Contact the listed study coordinator or principal investigator to request pre-screening. Pre-screening is free and never obligates you to enroll.