NCT07093853 Mandibular Overdentures Retained by Four Locator Attachments Versus Four-Implant Bar Attachments
| NCT ID | NCT07093853 |
| Status | Recruiting |
| Phase | — |
| Sponsor | Menoufia University |
| Condition | Bone Loss |
| Study Type | OBSERVATIONAL |
| Enrollment | 22 participants |
| Start Date | 2024-01-01 |
| Primary Completion | 2025-08-01 |
Trial Parameters
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Brief Summary
This 10-year retrospective study investigates residual ridge changes in edentulous patients treated with mandibular overdentures (ODs) retained by either four Locator attachments or a four-implant bar system. Although two-implant ODs are well established, four-implant configurations may offer enhanced stability and function. Locator and bar attachments are commonly used, but their long-term effects on bone resorption patterns-especially posterior mandibular and anterior maxillary resorption-remain unclear. By standardizing implant positions, this study aims to directly compare the two systems to help guide clinicians in selecting the most effective attachment type for long-term success.
Eligibility 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.