Sobha, K (2011) Evaluation of stress distribution in fixed partial dentures with pier abutments using rigid and nonrigid connectors: A finite element analysis. Masters thesis, Tamil Nadu Government Dental College and Hospital, Chennai.
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Abstract
In recent years fixed prosthesis has obtained an increasing acceptance from partially edentulous patients as it regains comfort, masticatory ability, appearance, health and integrity of the dentition. Planning a fixed prosthesis requires a sharp acumen to diagnose the presenting conditions and a thorough knowledge of the available treatment methods. In the success of fixed partial denture, abutment plays an important role. The type of occlusion, amount of bone present and periodontal health of the tooth also determines the success rate. The health of the periodontium depends upon several factors and one such vital factor is the magnitude and direction of load and the stresses induced thereupon. The vertical stress directing along the long axis of the tooth is less injurious when compared to the oblique force, which is more deleterious to the periodontium. Apart from the load applied, the resilient character of the restoration also plays an appreciable role. The occlusal stress may cause periodontal injury when it goes beyond the adaptive capacity of the periodontium. Torque is the most dangerous force to injure the periodontium to the maximum level due to development of shear stress. Deleterious forces can also cause bone resorption and inflammation of the periodontium. AIM OF THE STUDY: To evaluate the amount of stress distribution in fixed partial dentures with pier abutments using rigid and nonrigid connectors. OBJECTIVES: 1. To evaluate the amount of stress transmitted to the supporting structure by loading a fixed partial denture with pier abutment using a rigid connector design. 2. To evaluate the stress distribution using a different orientation of nonrigid connector design in four locations: Distal to mesial abutment (canine), Mesial to pier abutment (second premolar), Distal to pier abutment (second premolar), Mesial to distal abutment (second molar), 3. To evaluate the stress distribution under different loading conditions: Loading of all teeth to simulate maximum centric occlusion contacts, Loading of canine to simulate a single anterior contact, Loading of second molar to simulate a single posterior contact, 4. To compare the stress distribution with rigid and nonrigid design types. CONCLUSION: This study was done to evaluate the stress distribution in fixed partial dentures with pier abutments using rigid and a different orientation of nonrigid connector designs. A finite element study was done to determine the amount of stress distribution and to find out the ideal location of nonrigid connector. Finite element models were simulated using CATIA V5R18 software by giving various commands. All the five models were loaded with a static vertical occlusal force of 50N to the cusp fossa to simulate anterior, posterior and complete loading. The results were analyzed and interpreted using ANSYS software through IGES (Initial Graphic Exchange Specification) file. The data obtained were tabulated and statistical analysis was done. The findings of the present study support the following conclusions. 1. The stress distribution in fixed partial denture with pier abutment was affected by the presence and location of a nonrigid connector. 2. The area of minimum stress concentration occurs in pier abutments when the nonrigid connector was positioned distal to the pier abutment. 3. The overall stress distribution on the pier abutment was decreased when a nonrigid connector with an elastic cap was used. Finite element analysis suffers from several limitations, mostly related to necessarily simplified assumptions due to the lack of information about material properties, uncertainty of correct load distribution, assignment of the proper boundary conditions and creation of a valid mesh.
| Item Type: | Thesis (Masters) |
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| Uncontrolled Keywords: | stress distribution ; fixed partial dentures ; pier abutments ; rigid and nonrigid connectors ; A finite element analysis. |
| Subjects: | DENTAL > Prosthodontics and Crown and Bridge |
| Depositing User: | Thavamani K |
| Date Deposited: | 04 Jul 2017 14:16 |
| Last Modified: | 04 Aug 2022 10:51 |
| URI: | http://repository-tnmgrmu.ac.in/id/eprint/922 |
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