Biomechanical Stress in Obturator Prostheses: A Systematic Review of Finite Element Studies

Abstract

Aim. This systematic review is aimed at investigating the biomechanical stress that develops in the maxillofacial prostheses (MFP) and supporting structures and methods to optimize it. Design and Methods. A literature survey was conducted for full-text English articles which used FEA to examine the stress developed in conventional and implant-assisted MFPs from January 2010 to December 2020. Results. 87 articles were screened to get an update on the desired information. 74 were excluded based on a complete screening, and finally, 13 articles were recruited for complete reviewing. Discussion. The MFP is subjected to stress, which is reflected in the form of compressive and tensile strengths. The stress is mainly concentrated the resection line and around the apices of roots of teeth next to the defect. Diversity of designs and techniques were introduced to optimize the stress distribution, such as modification of the clasp design, using materials with different mechanical properties for dentures base and retainer, use of dental (DI) and/or zygomatic implants (ZI), and free flap reconstruction before prosthetic rehabilitation. Conclusion. Using ZI in the defective side of the dentulous maxillary defect and defective and nondefective side of the edentulous maxillary defect was found more advantageous, in terms of compression and tensile stress and retention, when compared with DI and free flap reconstruction.

Suitability and Trueness of the Removable Partial Denture Framework Fabricating by Polyether Ether Ketone with CAD-CAM Technology

“…Varying designs of removable partial dentures, involving variances in the shape of the clasp and thickness of the framework, had been shown to possess a significant effect on abutment teeth as well as the surrounding oral soft and hard tissues [ 31 , 32 , 33 , 34 ]. With the goal of clarifying the design principles of PEEK RPDs, the stress distribution of the PEEK RPD framework in different designs will be further improved and analyzed in the subsequent research to find the best design for various cases of dentition defect.…”

Finite element stress analysis in mandibular molars with apical root resorption and crown destruction after root canal treatment using various materials

“…Inan et al (32) compared FEM and photoelastic methods for evaluating stress in the supporting bone around implants and found that both methods provide stress distribution information, but FEM provides more detailed and comprehensive results. Mousa et al (33) analyzed obturator biomechanical stresses using FEM and concluded that FEM can be reliably used to analyze stress distribution in various defect types, prosthesis rehabilitations, and supporting structures. Based on these studies, stress analysis using FEM was conducted in our research.…”

Rehabilitation of Aramany Classification I Defect on a Completely Edentulous Patient: A Clinical Case Report.

“…8 Using Zigomatic Implant in the edentulous maxillary defect was found more advantageous, in terms of compression and tensile stress and retention, when compared with conventional dental Implant. 9 Except when contraindicated due to financial or surgical considerations, implant-assisted overdentures are usually the treatment of choice. During this case, although the patient understands the advantages of implantsupported prosthesis she isn't interested and only prefers a non-invasive conventional treatment.…”