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- Title
Effect of vertical misfit and clip material on stress distribution of overdentures under masticatory loading.
- Authors
Santos, Mateus; Zen, Bruno; Bacchi, Atais; Dos Santos, Mateus Bertolini Fernandes; Zen, Bruno Massucato
- Abstract
Framework misfit is a common problem observed in overdentures, which might result in prosthetic and biological complications. The aim of this study was to evaluate the influence of vertical misfit and clip material on the stress distribution in an overdenture-retaining bar system under masticatory loading. A 3-D finite element model of a resorbed jaw was created, including two implants and a bar-clip retained overdenture. A pressure of 100 MPa was applied to the right mandibular first molar. Different vertical misfit levels (50, 100, and 200 µm) and clip materials (plastic or gold) were evaluated. Data were evaluated using von Mises stress and microstrain. Vertical misfit amplification caused an increase in the microstrain values in the peri-implant bone tissue next to the ill-fitted component and increased the stresses in the prosthetic screws. The clip material influenced the stress and microstrain distribution in the prosthetic components and bone tissue. The levels of vertical misfit seem to be closely linked with the stress values in the prosthetic screws, mainly to that of the ill-fitted component. The gold clip presented an increase in the stress compared to the plastic clip.
- Subjects
COMPLICATIONS of prosthesis; SURGICAL instruments; OVERLAY dentures; BONE screws; FINITE element method; DENTISTRY; DENTURES; DENTAL implants; MASTICATION
- Publication
Medical & Biological Engineering & Computing, 2016, Vol 54, Issue 10, p1515
- ISSN
0140-0118
- Publication type
journal article
- DOI
10.1007/s11517-015-1426-0