Circumferential bone level and bone remodeling in the posterior mandible of edentulous mandibular overdenture wearers: influence of mandibular bone atrophy in a 3-year cohort study.

Abstract

OBJECTIVES:

Evaluate circumferential bone level and morphological alterations in the posterior mandibular ridge of atrophic (AP) and non-atrophic (NAP) patients using implant-retained mandibular overdentures (MO) over 3 years.

MATERIALS AND METHODS:

Twenty-six edentulous patients categorized according to mandibular atrophy (AP = 13/NAP = 13) received two narrow diameter implants (Facility, 2.9 × 10 mm) in the anterior region of mandible. The vertical and horizontal bone level was measured along with bone remodeling at 4 distances from the mental foramen in the posterior region of the mandible (L1-L4) via CBCT.

RESULTS:

NAP showed significantly higher total height and medullary height in all posterior regions at 1 and 3 years (p ≤ 0.01). Cortical height and width were significantly higher (p ≤ 0.05) in this group at distances L1 and L4, respectively, in year 1. NAP shows a significantly higher % of medullary height at distances L1 (p ≤ 0.05), L2 (p ≤ 0.01), and L3 (p ≤ 0.05) after 1 year, and at all distances (p ≤ 0.05) after 3 years. Bone remodeling in the groups differed significantly (p ≤ 0.05) in terms of cortical width and % medullary width at L3.

CONCLUSION:

AP and NAP showed similar vertical and horizontal bone level. Bone resorption in the posterior ridge was stabilized by MO over 3 years; however, AP are more susceptible to the long-term substitution of medullary bone by cortical bone.

CLINICAL RELEVANCE:

This study is the first to longitudinally evaluate bone dimensions in atrophic and non-atrophic two-implant MO users by CBCT and revealed that MO is a predictable treatment based on the stabilization of the posterior bone resorption.

• Authors: Alessandra Julie Schuster, Anna Paula da Rosa Possebon, André Ribeiro Schinestsck, Otacílio Luiz Chagas-Júnior, Fernanda Faot
• Journal: Clinical oral investigations (Clin Oral Investig) Vol. 26 Issue 3 Pg. 3119-3130 (Mar 2022) ISSN: 1436-3771 [Electronic] Germany
• PMID: 34854990 (Publication Type: Journal Article)
• Copyright: © 2021. The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature.

Chemical References

• Dental Implants

Topics

• Atrophy (pathology)
• Bone Resorption (pathology)
• Cohort Studies
• Dental Implants
• Dental Prosthesis, Implant-Supported
• Denture, Overlay
• Humans
• Mandible (diagnostic imaging, pathology)