Clinical Outcomes of Three versus Four Mini-Implants Retaining Mandibular Overdenture: A 5-Year Randomized Clinical Trial

Scientific paper - Original scientific paper

• Author: Asja Čelebic
• Author: Ines Kovačić
• Author: Nikola Petričević
• Author: Mohammed Nasser Alhajj
• Author: Jolanda Topić
• Author: Luka Junaković
• Author: Sanja Peršić-Kiršić
• Author's institution: University of Zagreb; School of Dental Medicine; (Department of Removable Prosthodontics)
• Scientific / art field, discipline and subdiscipline: BIOMEDICINE AND HEALTHCARE; Dental Medicine; Prosthetic Dentistry

Abstract (english)

Background and Objectives: Due to a lack of long-term clinical studies that would clarify whether the insertion of three mini-implants (MDIs) can be as successful treatment as the insertion of four MDIs for the retention of mandibular overdentures (ODs), this 5-year prospective cohort study was set up. Materials and Methods: Participants (n = 83) randomly received either four or three MDIs and a mandibular OD. Clinical examinations were performed at the baseline, as well as after one, three, and five years, respectively. A total of 73 participants (38 in the four-MDI and 35 in the three-MDI groups) partook in the study. The marginal bone level change, success and survival rates, and prosthodontic maintenance were assessed. Results: Repeated measures showed that the mean peri-implant bone loss increased progressively at a small amount over five years in both groups (four-MDI group = −0.36 ± 0.74; three-MDI group = −0.33 ± 0.27 mm; p < 0.05). However, an ANCOVA revealed no significant effects of the group (no significant difference between the three- and the four-MDI groups; F = 0.085; p = 0.771), gender (F = 0.023; p = 0.88), or covariate age (F = 1.95; p = 0.167) on the dependent variable: the 5-year MBL change. The success rate (together with successful survival) was 93.8% in the four-MDI group and 91.7% in the three-MDI group. The log-rank (Mantel–Cox) test revealed no significant differences between them (X2 = 0.373; p = 0.541). Conclusions: In patients with narrow ridges, the insertion of three MDIs in the mandible for overdenture retention can be equally as successful as the insertion of four MDIs.

• Keywords (english): mini-implants; mandibular overdenture; marginal bone level; success; survival
• Language: english
• Publication type: Scientific paper - Original scientific paper
• Publication status: Published
• Peer review: Peer review - international
• Publication version: Published version
• Journal title: Medicina
• Numbering: vol. 60, no. 1, 17
• e-ISSN: 1648-9144
• DOI: https://doi.org/10.3390/medicina60010017
• URN:NBN: urn:nbn:hr:127:940348
• Publication: 2023-12-21
• Document URL: https://www.mdpi.com/1648-9144/60/1/17
• Type of resource: Text
• Access conditions: Open access
• Created on: 2024-02-15 08:06:05