Gantini Subrata

3D Reconstruction and Stress Analysis of the Free End Second Premolar Root Form Dental Implant

Stress distributions that occur in the free end second premolar tooth and its root form dental implant replacement were evaluated using finite element method. In the modelling process, 3D reconstructions were performed. Instead of doing it manually, the 3D reconstruction in this paper was done using cone beam computed tomography (CBCT) scanning process. The 3D reconstruction method used in this paper, is considerably faster than the traditional manual 3D reconstruction method. In order to mimic the actual biting force, static load of 200 N was modelled in the vertical direction parallel to the long axis of the tooth which is placed on bite contact at second premolars and dental implant crown. The stress result on root form dental implant is generally higher than the stress on the natural free end second premolar tooth. The stress concentration locations on root form dental implant were also found and will be used in the future to improve the design of root form dental implant.

Design of root canal treatment for dental post application on maxillary central incisor

The main purpose of this study is to evaluate the stress distribution on the maxillary central incisor tooth that has been endodontically treated and restored with silver alloy (silver-palladium) cast post-cores, and to find the optimum wall thickness and height of ferrule for dentin. 3D numerical analysis was done using ANSYS 14® software. Evaluation of stress distribution were done upon eight different variants of maxillary central incisor tooth with ferrule root restoration. The ferrule was modeled with ferrule height variation of 0,5 mm, 1 mm, 1.5 mm, and 2 mm, with constant ferrule wall thickness of 1 mm, while ferrule wall thickness variation of 0.8 mm, 0,9 mm,1 mm, 1,1 mm, and 1.2 mm was modeled with constant ferrule height of 2 mm. Analysis of ferrule which was done with the help of finite element method shows that the optimum ferrule height is 1,5 mm and the optimum ferrule wall thickness is 1 mm. Both models have shown to have the least amount of stress on every components of the tooth. Variants of tooth models have shown to have range of maximum principal stress from 51 MPa to 81,3 MPa and range of minimum principal stress from 12 MPa to 21 MPa, which is far below maximum tensile strength (98 MPa) and compressive strength (297 MPa) of the dentin.

Ligamen periodontal sebagai pendukung gaya kunyah Periodontal ligament acts to support mastication force

Support for removable partial denture (RPD) can be obtained from bone supported mucosa and or from periodontal ligament of tooth. Support can also be obtained from implant. Tooth support (periodontal ligament) is better than mucosal support because histologically, anatomically, and also physiologically, in addition, periodontal ligament acts to resist mastication force.