Influence of denture tooth thickness on fracture mode of thin acrylic resin bases: An experimental and finite element analysis

The Journal of Prosthetic Dentistry
Takashi SekinishiNoriyuki Wakabayashi

Abstract

The optimum selection of denture teeth for patients with a reduced interarch distance has not been established. The purpose of this in vitro study was to investigate the influence of denture tooth material and thickness on the fracture resistance of thin acrylic resin denture bases. Acrylic resin (AC), composite resin (CO), or ceramic (CE) molar denture teeth were embedded in denture base blocks (2.0 mm thick). The distance from the central fossa to the tooth base was 0.5, 1.0, 2.0, or 2.5 mm for AC and CO, and 1.0 mm for CE (n=7), with a total thickness of 2.5 mm for all specimens. Each specimen was placed on a 3-point flexural setup with a shorter (8 mm) or longer (12 mm) support span than the tooth width and vertically loaded. A finite element analysis was performed to assess the stress distributions. The effects of tooth thickness and support span were statistically tested with ANOVA, followed by the Tukey honestly significant difference post hoc test (α= .05). With the shorter support, the mean fracture load was higher in CO than AC, regardless of the tooth thickness. Under the longer support, the mean fracture load with the CO decreased significantly as the tooth thickness increased, with increased maximum stress. Some CO...Continue Reading

References

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