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KMID : 0362420140520040305
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Journal of Korean Academy of Prosthodontics
2014 Volume.52 No. 4 p.305 ~ p.311
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Analysis of stress distribution of tooth restored with metal-ceramic crown covering abfraction lesion according to its finish line location under occlusal load
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Kim Jee-Hwan
Yoon Chol-Wook
Kim Tae-Hyeon
Kim Han-Sung
Woo Dae-Gon
Lee Keun-Woo
Shim June-Sung
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Abstract
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PURPOSE. When the full veneer crown was treated in the tooth with abfraction lesion due to various causes, the prognosis of it may be compromised according to the location of the finish line, but there is few study about the location of its buccal finish line. The purpose of this study was to investigate the effect of location of the finish line of the full veneer crown on stress distribution of the tooth with abfraction lesion.
MATERIALS AND METHODS. The two dimensional finite element model was developed to express tooth, surrounding tissue and full veneer crown. The stress distribution under eccentric 144 N occlusal load was analyzed using finite element analysis. The location of finish line was set just at the lower border of the lesion (Group 0), 1 mm (Group 1) and 2 mm (Group 2) below the lower border of the lesion.
RESULTS. In the Group 0, von Mises stress was concentrated at the finish line and the apex of the lesion. Also, the stress at the bucal finish line propagated to the lingual side. In the Group 1 and Group 2, stress distribution was similar each other. Stress was concentrated at the apex of lesion, but the stress at the buccal finish line did not propagate to the lingual side. That implied decrease of the possibility of horizontal crown fracture.
CONCLUSION. Full veneer crown alleviated the stress concentrated at the apex of the abfraction lesion, when the finish line of full veneer crown was set below the lower border of abfraction lesion.
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KEYWORD
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Abfraction, Metal-ceramic crown, Finish line, Stress distribution, Finite element analysis
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