Increased tooth mobility because of loss of alveolar bone support: a hazard for zirconia two-unit cantilever resin-bonded FDPs in vitro?

Abstract

This study evaluates in vitro the impact of increased abutment tooth mobility on survival of zirconia-based two-unit cantilever resin-bonded fixed dental prosthesis (RB-FDP) by long-term dynamic loading in a chewing simulator. Human maxillary central incisors (n = 32) were endodontically treated and alveolar bone loss was simulated: 0% (group B), 25% (group C), and 50% (group D). RB-FDPs were adhesively luted. Zirconia full crown two-unit FDPs served as control (group A). Specimens were exposed to simulated clinical function by two subsequent sequences of thermal-cycling (2 × 3.000) parallel to mechanical loading (1.2 × 10(6) load cycles) (TCML; first sequence: load 1-25 N; second sequence: load 1-50 N). Tooth mobility increased significantly as the simulated bone level decreased (p < 0.001). Log-rank tests revealed no significant differences between experimental groups (p = 0.479). The results support the assumption that zirconia-based two-unit cantilever RB-FDPs may be an appropriate treatment option, even if abutment tooth mobility increase because of alveolar bone loss. However, debonding of zirconia-based two-unit RB-FDPs will be a likely event, whereas fatal failures of the abutment teeth may not occur.

• Authors: Guido Sterzenbach, Rene Tunjan, Martin Rosentritt, Michael Naumann
• Journal: Journal of biomedical materials research. Part B, Applied biomaterials (J Biomed Mater Res B Appl Biomater) Vol. 102 Issue 2 Pg. 244-9 (Feb 2014) ISSN: 1552-4981 [Electronic] United States
• PMID: 23997026 (Publication Type: Journal Article)
• Copyright: Copyright © 2013 Wiley Periodicals, Inc.

Chemical References

• Resins, Synthetic
• Zirconium

Topics

• Alveolar Bone Loss
• Dental Prosthesis
• Humans
• Incisor
• Male
• Resins, Synthetic
• Stress, Mechanical
• Tooth Mobility
• Zirconium