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ORIGINAL ARTICLE
Year : 2019  |  Volume : 9  |  Issue : 4  |  Page : 338-348

Influence of radius of curvature at gingival embrasure in connector area on stress distribution of three-unit posterior full-contour monolithic zirconia Fixed Partial Denture on various amounts of load application: A finite element study


1 Department of Prosthodontics, Narayana Dental College and Hospital, Nellore, Andhra Pradesh, India
2 Department of Endodontics and Conservative Dentistry, Narayana Dental College and Hospital, Nellore, Andhra Pradesh, India
3 Department of Endodontics and Conservative Dentistry, GSL Dental College and Hospital, Rajhamandry, Andhra Pradesh, India
4 Department of Prosthodontics, CKS Theja Dental College and Hospital, Tirupati, Andhra Pradesh, India

Correspondence Address:
Dr. Kalamalla A SaranBabu
Assistant Professor, Narayana Dental College and Hospital, Chintareddypalem, Nellore-524003, Andhra Pradesh
India
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Source of Support: None, Conflict of Interest: None


DOI: 10.4103/jispcd.JISPCD_20_19

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Objectives: To test the hypothesis that radius of curvature at gingival embrasure in connector area significantly affects the fracture resistance of full-contour monolithic zirconia three-unit posterior Fixed partial denture (FPD) on various amounts of load application. Materials and Methods: In this study, two types of three-dimensional finite element models of a three-unit posterior full-contour monolithic zirconia FPD with two gingival embrasure radii (rGE I, 0.45mm and rGE II, 0.25mm) were constructed. The components modeled through finite element modeling were subjected to 400, 600, and 800N vertical loads at the central fossa of the pontic, and further analysis was carried out. Results: All the results were displayed by post-processor finite element analysis software (ANSYS). The study revealed that with increase in the amount of load application as well as decrease in the gingival embrasure radii, stress concentration values were increasing gradually for both the full-contour monolithic zirconia FPD. Conclusion: The fracture resistance of the zirconia posterior FPD was significantly affected by the gingival embrasure radii and the mode of load application. When there is a clinical situation of heavier occlusal forces, the fracture resistance can be increased by designing greater gingival embrasure radii in the connector region.


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