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Biomechanical evaluation of four different framework designs of cantilever zirconia resin bonded fixed dental prosthesis: A three-dimensional finite element analysis study

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Original Article

Author Details : Shachi Pankajbhai Patel*, Ina Bhupesh Patel, Kinjal Maheshbhai Solanki, Ravindra Mandanbhai Chavda, Ronak Hemant Choksi, Chirag Raghuvir Rudakia, Pooja Sawarmal Poonia

Volume : 10, Issue : 1, Year : 2024

Article Page : 22-30

https://doi.org/10.18231/j.aprd.2024.005

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Abstract

Aim: To measure stress and strain concentrations on four different RBFDP designs and its effect on cement layer and the Periodontal tissues using FEA.
Materials and Methods: Using CBCT data, two 3D models of a maxilla with missing lateral Incisor were printed. Tooth preparation for RBFDP was done. One model had proximal-groove of 4mm and other had 3mm proximal-groove. Four designs of cantilever RBFDPs were designed. Model-1: #21 abutment/ 3x3mm connector; Model-2: #21 abutment/ 3x4mm connector; Model-3: #23 abutment/ 3x3mm connector and; Model-4: #23 abutment/ 3x4mm connector. All Models were converted into FEA models, occlusal force of 200N was loaded at 450 to long axis of pontic and FEA was carried out. Maximum Principal Strain(MPS) in the RBFDP framework, periodontal tissues and Maximum Shear Stress(MSS) in cement layer were measured to evaluate the impact on periodontal tissues and the risk for framework-debonding respectively.
Results: The MPS of framework in decreasing order was: Model-1>Model-2>Model-3>Model-4. The MPS of PDL: Model-1 and Model-2 > Model-3 and Model-4. MSS in cement layer: Model-1 and Model-2 > Model-3 and Model-4. Adhesion area with shear stress >11MPa: Model-1 and Model-2 > Model-3 and Model-4. MPS and MMS values were lower in models with 3×4mm connector than models with 3x3mm connector.
Conclusion: Adequate Connector dimension and adhesion-area are critical for success of RBFDP. Within the limitations of this study, RBFDP design with 3x4mm connector and Maxillary Canine as abutment for replacing Maxillary Lateral Incisor is better option in terms of framework-debonding risk and preservation of periodontal tissues.
 

Keywords: Resin Bonded Fixed Dental Prostheses, Finite Element Analysis, Cantilever Prostheses, Y­TZP

How to cite : Patel S P, Patel I B , Solanki K M, Chavda R M , Choksi R H, Rudakia C R, Poonia P S, Biomechanical evaluation of four different framework designs of cantilever zirconia resin bonded fixed dental prosthesis: A three-dimensional finite element analysis study. IP Ann Prosthodont Restor Dent 2024;10(1):22-30

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