Journal of Conservative Dentistry
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ARTICLE
Year : 2005  |  Volume : 8  |  Issue : 3  |  Page : 32-42

Behavioural pattern of three different bilayered restorations under tensile loading in a modified abfrfactive lesion simulated by finite element analysis


Department of Conservative Dentistry & Endodontics, Meenakshi Ammal Dental College, Chennai-95., India

Correspondence Address:
R G Balaji
Department of Conservative Dentistry & Endodontics, Meenakshi Ammal Dental College, Chennai-95.
India
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Source of Support: None, Conflict of Interest: None


DOI: 10.4103/0972-0707.42589

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This study evaluates how three types of bilayered restorations behave in a modified abfractive lesion when subjected to a tensile load using a finite element model analysis. Mandibular premolars were used and an oblique load of 100 N was applied at an angle of 45 degrees to the long axis of the tooth. A wedge shaped lesion was then created on the buccal aspect of the tooth in the cervical region. It was then subjected to the same loading conditions. Then the internal line angle was rounded off and the tooth was subjected to the same loading conditions. This region then restored in four ways and subjected to the same loading conditions. The cavities were restored with a hybrid composite alone or with bilayered restorations. The stress analysis was performed on this tooth using the ANSYS solver The results were, stress was more in teeth with cervical lesions. Among the various restorations used it was seen that a combination of Z100 and Silux Plus performed the best. In conclusion it is seen that roundening of line angles is mandatory in wedge shaped cervical lesions. A bilayered restoration is to be used in which, the deeper layer has a low modulus of elasticity and a high ultimate tensile strength.


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