IInfluence of distal extension bar on hard and soft tissue outcomes around two implants supporting a mandibular overdenture: A 5-year clinical trial

Document Type : Original Article

Authors

1 Associate Professor, Department of Prosthodontics, Faculty of Dentistry, Mansoura University, Mansoura, Egypt

2 Associate Professor, Department of Oral Medicine and Periodontolgy, Faculty of Dentistry, Mansoura University, Mansoura, Egyp

3 Associate Professor, Department of Oral and maxillofacial Surgery Faculty of Dentistry, Mansoura, Mansoura, Egypt Associate Professor, Department of Oral and maxillofacial Surgery, Faculty of Dentistry, Horus University, New Damietta, Egypt

Abstract

Objectives: This randomized clinical trial aimed to investigate the potential influence of a short distal extension bar on marginal bone and soft tissues around a mandibular two-implant overdenture (2-IOD).
Patients and Methods: Thirty participants (18 males, 12 females) were randomly assigned to receive new maxillary complete denture, opposed by mandibular cast-bar-retained 2-IOD by using either a straight bar and a single clip as control group (SB) or bar with bilateral 7-mm distal extension and 3 nylon clips as intervention group (DBE). Peri-implant marginal Bone Loss (PiBL) and clinical soft tissue parameters were evaluated during a 5-year follow-up. Data were analyzed to detect differences between groups or time points.
Results: Study data were collected from 26 patients (9 females and 17 males) and were analyzed after considering 4 patients as dropouts. PiBL in both groups significantly occurred after the first year when compared with other time points, which showed a slower rate. Distal aspect in DBE showed statistically significant less bone loss when compared to the mesial aspect in the first two years. Both mesial and distal aspects recorded non-significant differences between SB and DBE groups when they were compared at any of the time points. DBE group registered improved clinical parameters compared to SB group during the evaluation periods. At the end of the study, there were no differences between groups for most indices.
Conclusions: Within the considered limitations, Mandibular 2-IOD supported by a bar with short distal extensions can provide predictable outcomes regarding peri-implant hard and soft tissues.

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Egyptian Dental Journal
Volume 71, Issue 3 - Serial Number 4
Fixed Prosthodontics, Removable Prosthodontics and Dental Materials
July 2025
Pages 2439-2455

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