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DENTAL SCIENCE - ORIGINAL ARTICLE
Year : 2012  |  Volume : 4  |  Issue : 6  |  Page : 384-389

Finite element analysis of stresses in fixed prosthesis and cement layer using a three-dimensional model


1 Department of Prosthodontics, Vivekanandha Dental College for Women, Elayampalayam, Tiruchengodu, India
2 Department of Prosthodontics, Sri Ramachandra Medical University, Porur, Chennai, India
3 Department of Prosthodontics, Nooral Islam College of Dental Science, NICE Garden, Aralummood, Neyyatinkara, Kerala, India

Correspondence Address:
Arunachalam Sangeetha
Department of Prosthodontics, Vivekanandha Dental College for Women, Elayampalayam, Tiruchengodu
India
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Source of Support: None, Conflict of Interest: None


DOI: 10.4103/0975-7406.100291

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Context: To understand the effect of masticatory and parafunctional forces on the integrity of the prosthesis and the underlying cement layer. Aims: The purpose of this study was to evaluate the stress pattern in the cement layer and the fixed prosthesis, on subjecting a three-dimensional finite element model to simulated occlusal loading. Materials and Methods: Three-dimensional finite element model was simulated to replace missing mandibular first molar with second premolar and second molar as abutments. The model was subjected to a range of occlusal loads (20, 30, 40 MPa) in two different directions - vertical and 30° to the vertical. The cements (zinc phosphate, polycarboxylate, glass ionomer, and composite) were modeled with two cement thicknesses - 25 and 100 μm. Stresses were determined in certain reference points in fixed prosthesis and the cement layer. Statistical Analysis Used: The stress values are mathematic calculations without variance; hence, statistical analysis is not routinely required. Results: Stress levels were calculated according to Von Mises criteria for each node. Maximum stresses were recorded at the occlusal surface, axio-gingival corners, followed by axial wall. The stresses were greater with lateral load and with 100-μm cement thickness. Results revealed higher stresses for zinc phosphate cement, followed by composites. Conclusions: The thinner cement interfaces favor the success of the prosthesis. The stresses in the prosthesis suggest rounding of axio-gingival corners and a well-established finish line as important factors in maintaining the integrity of the prosthesis.


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