Abstract
Introduction The removable partial denture (RPD) components, especially the retentive arm, play a major role in the loading characteristic on supporting structures. Objective To evaluate and compare the effect of different clasp designs on the stress distribution pattern, maximum von Mises stress, and average hydrostatic pressure on abutment teeth, as well as edentulous ridges, mini dental implants (MDIs), and peri-implant bone between the conventional removable partial denture (CRPD) and mini dental implant-assisted distal extension removable partial denture (IARPD) using a three-dimensional finite element analysis (3D FEA). Materials and Methods 3D FEA models of mandibular arches, with and without bilateral MDI at the second molar areas, and Kennedy class I RPD frameworks, with RPA, RPI, Akers, and no clasp component, were generated. A total of 200 N vertical load was bilaterally applied on both sides of distal extension areas, and the stress was analyzed by 3D FEA. Results The stress concentration of IARPD with RPI clasp design was located more lingually on abutment teeth, MDI, and peri-implant bone, while the other designs were observed distally on the supporting structures. The maximum von Mises stress on the abutment root surface was decreased when the RPDs were assisted with MDIs. The CRPD and IARPD with the Akers clasp design showed the highest von Mises stress followed by the designs with RPA and RPI clasp, respectively. The average hydrostatic pressure in each group was in approximation. Conclusion The placement of MDIs on distal extension ridges helps to reduce the stress concentration on denture supporting structures. The maximum von Mises stress is affected by the different designs of clasp components. The CRPD and the IARPD with RPI clasp provide the least stress on supporting structures.
Highlights
Among modern dental treatment modalities, the restoration of partial edentulous ridges with removable partial denture is accepted as a standard treatment option [1]
The present research aims to investigate the effect of different clasp designs on the stress distribution pattern and the maximum von Mises stress on the supporting structures as well as to evaluate the suitability of the mini dental implants in conjunction with mandibular distal extension removable partial denture (RPD) as the complementary supporting component
The 3D finite element analysis (3D FEA), which is a well-accepted technique for theoretical calculating of stress distribution within a complex model, was performed to investigate the stress distribution pattern and the maximum von Mises stress on supporting structures between the conventional removable partial denture (CRPD) and the implant-assisted distal extension removable partial denture (IARPD). e results from our study could be valuable for developing the concept of distal extension base RPD designs that focused on preserving the integrity of the remaining oral structures, providing great satisfaction in function and the high survival rate of RPD supporting structures including the assisted dental implants on the free-end saddle areas
Summary
Among modern dental treatment modalities, the restoration of partial edentulous ridges with removable partial denture is accepted as a standard treatment option [1]. Is condition contributes to the decreasing ability of MDIs to carry or support the prostheses compared with the normal-sized dental implant According to this drawback, the RPDs with mini dental implants assisted on the edentulous ridges should be concerned on controlling of torque loaded on supporting structures especially at the RPD abutment teeth and other supporting structures during functions. To the best of our knowledge, there are currently no studies addressing the possibility of applying a mini dental implant as a supporting component in the distal extension ridge For these reasons, the present research aims to investigate the effect of different clasp designs on the stress distribution pattern and the maximum von Mises stress on the supporting structures as well as to evaluate the suitability of the mini dental implants in conjunction with mandibular distal extension RPDs as the complementary supporting component. The 3D finite element analysis (3D FEA), which is a well-accepted technique for theoretical calculating of stress distribution within a complex model, was performed to investigate the stress distribution pattern and the maximum von Mises stress on supporting structures between the CRPDs and the IARPDs. e results from our study could be valuable for developing the concept of distal extension base RPD designs that focused on preserving the integrity of the remaining oral structures, providing great satisfaction in function and the high survival rate of RPD supporting structures including the assisted dental implants on the free-end saddle areas
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