Mechanical Behaviour of Ceramic Layered Zirconia Restorations: A Three Dimensional Finite Element Analysis using Microcomputed Tomography Data
Journal Title: Journal of Clinical and Diagnostic Research - Year 2018, Vol 12, Issue 7
Abstract
Introduction: Combining the strength of zirconia cores with superior aesthetics of a weaker veneer ceramic can result in a reliable and more biocompatible restoration. Aim: To investigate the mechanical behaviour with respect to different designs of zirconia-ceramic veneer interface using three-dimensional finite element analysis. Materials and Methods: Tooth preparation of the indicated mandibular molar was done for three patients. Each patient was restored with a different design of zirconia-ceramic interface (Design I- full ceramic veneer, Design II- ceramic veneer on buccal surface extending upto occlusal surface, Design III- ceramic veneer on buccal surface only). Cone Beam Computed Tomography (CBCT) image was taken for each patient after the cementation of the restoration which was used to develop 3D finite element models by applying appropriate softwares (Mimics, Rapidform, Hypermesh, ANSYS). Four types of loads were applied to each of the 3D finite element model-600 N load was applied vertically, 225 N load was applied in three directions (vertically, oblique at 45° and horizontally) at different points on occlusal surface and their buccal inclines. Maximum principal stress and minimum principal stress were obtained by finite element analysis. Results: When vertical loads of 600 N and 225 N were applied, ceramic layer of design II experienced larger tensile stresses 21.83 MPa and 28.33 MPa. When horizontal load of 225 N was applied, tensile stress in ceramic layer was largest in design I i.e., 29.87 MPa. When an oblique load of 225 N was applied, largest tensile stress in ceramic layer of 12.82 MPa was observed in design I. Conclusion: The different design characteristics of the junction between ceramic and zirconia will affect the bond between zirconia core and ceramic veneer. Design III has the least chances of chipping of ceramic layer under masticatory loads. Design II is more prone to chipping of ceramic layer under masticatory loads. Design I may show chipping under high occlusal loads.
Authors and Affiliations
Shruti Singh, Ponnanna Appanna, Kashinatha Holenarasipur Manjunath, Nitesh Rai, Ranganatha Rao K Jingade, Harish Kumar Muniswamy
Keywords
Related Articles
- EP ID EP526102
- DOI 10.7860/JCDR/2018/31339.11792
- Views 82
- Downloads 0
Inverse Association between Serum Bilirubin Levels and Retinopathy in Patients with Type 2 Diabetes Mellitus
Introduction: Oxidative stress plays a central role in the pathogenesis of Diabetic Retinopathy (DR) and serum bilirubin has been shown to have antioxidant properties. Aim: To investigate the association between serum bi...
Glycosylated Haemoglobin as a Risk Predictor of Coronary Artery Disease in Patients with Stable Angina
ABSTRACT Introduction: Glycosylated HaemoglobinA1c (HbA1c) is a time-integrated marker for glycaemic control. It also helps in predicting the risk of Coronary Artery Disease (CAD) among diabetic patients. Aim: To determi...
Massive Ascites and Pleural Effusion in Preeclampsia
Preeclampsia is defined as new onset hypertension and proteinuria after 20 weeks of gestation and complicates approximately 2-8% of all pregnancies. Release of vasoconstrictive agents, endothelial damage, hyperpermeabili...
Maintaining ‘V-Contour’ of the Neck after Surgery for Neglected Congenital Muscular Torticollis in an Adult (A New Technique)
ABSTRACT In Congenital Muscular Torticollis (CMT), also called twisted neck or wryneck, an individual holds his or her head tilted to one side. There is a little consensus on the treatment approach of neglected CMT after...
Biomechanical Study of Trapezoidal Plate, Delta Plate and Miniplate in Subcondylar Fracture
ABSTRACT Introduction: Condylar fracture accounts for 25-35% of all mandibular fracture. When it comes to open reduction and internal fixation, the design of the plate plays a crucial role to withstand the amount of mas...