Mandibular overdentures held by four Locator attachments versus a four-implant bar
Official title: Residual Ridge Changes in Mandibular Overdentures Retained by Four Locator Attachments Versus Four-Implant Bar Attachments: A 10-Year Retrospective Study
Run by Menoufia University · NCT07093853 · Data updated 2026-11-12
This study tests whether mandibular overdentures retained by four Locator attachments or by a four-implant bar better preserve jaw bone in people who have been fully toothless for at least a year.
Quick facts
| Study type | Observational |
|---|---|
| Ages | 40 Years to 70 Years |
| Sex | All |
| Enrollment | 22 (estimated) |
| Sponsor | Menoufia University Academic / other |
| Locations | 1 site (Al Mansurah, Menoufia) |
| Status | Recruiting |
| Started | January 1, 2024 |
| Main results expected | August 1, 2025 |
| Study ends | October 1, 2025 |
| Registry record updated | July 30, 2025 |
| Trial ID | NCT07093853 on ClinicalTrials.gov |
Is this trial a fit for you?
✓Likely a good fit
Ideal candidates are adults who have been completely edentulous in both jaws for at least 12 months, received four interforaminal implants in the specified positions, and have at least 10 years of radiographic follow-up.
✕Probably not a fit
Patients with systemic bone metabolism disorders, heavy smokers or alcohol abusers, parafunctional habits, implant failures, or implants placed outside the interforaminal region are unlikely to benefit from these specific comparisons.
A plain-English reading of the study's rules. Only the study team can confirm whether you qualify.
What this trial studies
This is a 10-year retrospective comparison of residual ridge changes in completely edentulous patients treated with mandibular overdentures retained by either four Locator attachments or a four-implant bar system. Implant positions are standardized (four interforaminal implants placed in the lateral incisor and first premolar regions) to allow direct comparison of attachment mechanics. Key outcomes include posterior mandibular ridge resorption, marginal bone loss around implants, and anterior maxillary ridge changes, measured from radiographic records over a minimum 10-year follow-up. The dataset comes from patients treated and followed at the dental faculty in Al Mansurah/Menoufia with strict inclusion and exclusion criteria to minimize confounding factors.
Why it matters
Potential benefit: If successful, the results could help clinicians choose the attachment type that better maintains jaw bone and long-term denture stability for fully edentulous patients.
How similar studies have gone: Previous shorter-term studies show both Locator and bar attachments can work well and have different biomechanical advantages, but long-term direct comparisons using four standardized implants are limited.
Who can join: the full rules
Show full inclusion / exclusion criteria
Inclusion Criteria: * Completely edentulous mandible and maxilla for at least 12 months. * Four interforaminal dental implants placed in the lateral incisor and first premolar regions. * Opposing maxillary complete denture constructed using a muco-compressive impression technique, with maximum denture base extension and lingualized occlusion. * Mandibular bone height between 15-25 mm at the symphysis region as measured on panoramic radiograph. * Minimum 10-year follow-up with adequate radiographic documentation. Exclusion Criteria: * Systemic diseases affecting bone metabolism. * Parafunctional habits (e.g., bruxism). * Smokers of more than 10 cigarettes/day or those with alcohol abuse. * Patients with implant failures, missing follow-up data, or implants placed outside the interforaminal region.
Where it's running
-
Faculty of Dentistry
Al Mansurah, Menoufia, Egypt Recruiting
Study contacts
- Principal investigator: Mohammed El-Sawy, PhD — Menoufia University
- Study coordinator: Mohammed El-Sawy, PhD
- Email: Dr_sawy@windowslive.com
- Phone: 00201061314522
Similar studies
Other studies for the same condition or treatment. Recruiting studies are listed first.
-
All-on-6 upper jaw implants placed with stackable guided surgery and immediate loading
This study will test whether a fully digital stackable guided surgery workflow with immediate loading works well for adults needing full-arch upper jaw (All-on-6) implants.
-
Guided Equator overdentures for the lower jaw
This project tests whether fully guided computer-assisted implant placement with Equator attachments gives reliable implant survival and less bone loss for adults with a completely edentulous lower jaw.
-
How three prosthetic methods affect bone levels around dental implants
This trial will test whether three different prosthetic approaches for posterior dental implants change marginal bone levels around the implant over one year in adults eligible for Lance implants.
-
Evaluation of AdvanCore Bone Graft for Bone Healing
This study is testing if the AdvanCore bone graft can help adults with serious bone defects heal better over a year.
-
Comparing high-resolution and pQCT scans to view bone and muscle structure
This study will try high-resolution CT (HR-pQCT), pQCT, and DXA scans to see if they reveal bone and muscle microarchitecture changes in adults at risk of osteoporosis or muscle loss.
-
Custom-made implants for failed hip surgeries
This study is testing whether custom-made hip implants can help adults who need surgery to fix problems from previous hip surgeries due to severe bone damage.
How to take part
- Review the eligibility criteria above with your treating physician.
- Check the official listing on ClinicalTrials.gov for the latest contact details and recruitment status.
- Contact the study coordinator or principal investigator to ask for pre-screening. Pre-screening is free and never obligates you to enroll.