Radiographic and Retention Evaluation Over Seven Years for Four Implant Retained Overdenture

Marginal Bone Loss and Retention of Four-Implant Locator-Retained Mandibular Overdentures: 7 Years Follow up

ABSTRACT Statement of the problem: Insufficient long-term retrospective data is evaluating marginal bone loss and retention of four-implant Locator-retained mandibular overdentures.

Purpose: To assess marginal bone loss and retention of four-implant Locator-retained mandibular overdentures over seven years at the time of overdenture insertion (T0), 1 year (T1), and 7 years (T7) after insertion.

Material and methods: This retrospective study included 27 completely edentulous patients with maxillary single denture, and four parallel implants were placed interforaminal, and they already have a mandibular four-implant retained overdenture with LOCATOR attachments.

Inclusion Criteria Patients rehabilitated with a mandibular overdenture retained by four dental implants.

Four implants positioned in the anterior and premolar regions of the mandible. Four Locator attachments used to retain the mandibular overdenture. Availability of baseline clinical and radiographic records at the time of prosthesis insertion.

Availability of clinical and radiographic records at 1-year and 7-year follow-up.

Exclusion Criteria Patients with incomplete clinical or radiographic records. Patients without the required 1-year or 7-year follow-up records. Patients with radiographs that were inadequate for reliable assessment of peri-implant marginal bone levels.

Patients whose records did not allow assessment of prosthetic retention at the specified follow-up periods.