Mandibular Overdentures Retained by Four Locator Attachments Versus Four-Implant Bar Attachments
Residual Ridge Changes in Mandibular Overdentures Retained by Four Locator Attachments Versus Four-Implant Bar Attachments: A 10-Year Retrospective Study
Menoufia University
22 participants
Jan 1, 2024
OBSERVATIONAL
Conditions
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
Inclusion Criteria5
- 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 Criteria4
- 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.
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Interventions
This study retrospectively evaluated two types of implant-retained mandibular overdenture attachment systems placed in edentulous patients over a 10-year period. All patients received four dental implants placed in the interforaminal region (lateral incisor and first premolar areas). In the Locator group, each implant was restored with an individual Locator attachment, allowing for independent retention and easier hygiene access. In the Bar group, the four implants were splinted together with a rigid metal bar, and the overdenture was attached using clips that engaged the bar, offering splinted support and enhanced load distribution. Both interventions were designed to support mandibular overdentures and were compared in terms of their long-term effects on posterior mandibular ridge resorption, marginal bone loss around implants, and anterior maxillary ridge resorption.
Locations(1)
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NCT07093853