Comparative Evaluation of Stress Acting on Abutment, Bone, and Connector of Different Designs of Acid-Etched Resin-Bonded Fixed Partial Dentures: Finite Element Analysis

Abstract

Background: Finite element analysis (FEA) is one of the best methods for evaluating the stress distribution of restorations, such as fixed partial dentures. The development of resin cement has transformed prosthesis bonding and retention properties. Resin-bonded fixed partial dentures (RBFPD) have been considered minimally invasive treatment options for the prosthetic rehabilitation of single missing teeth.Objectives: The aim of this study was to evaluate the stress load and distribution in four different designs of acid-etched RBFPDs using FEA.Materials and Methods: The designs included standard tooth preparation principles and additional features. The first premolar and first molar abutments replaced the missing second premolar. Designs 1, 2, 3, and 4 included (1) lingual wings and occlusal rests; (2) wings and proximal slices; (3) wings, rests, and grooves; and (4) wings, rests, grooves, and occlusal coverage. The prepared models were restored with RBFPDs. A load of 100 N was applied to the central groove of the pontic to simulate occlusal forces. The materials used in the models were considered to be isotropic, homogeneous, and linearly elastic. FEA was used to reveal stresses acting on the abutment, bone, and connector in all prosthesis designs.Results: The stresses transmitted to the abutment and bones were lowest for design 3, using wings, rests, and grooves. The stresses acting on the connector were the weakest in design 2. The stresses transmitted to the abutment and bone were highest in designs 1 and 4. The stresses transmitted to the connector were highest in design 3.Conclusion: The wings, rests, and grooves design is possibly the ideal and conservative tooth preparation design to receive a posterior RBFPD. This design transmits less stress to the abutments and less bone resorption in the FEA. It is most likely to be successful in the clinical provision and ensures the longevity of the prosthesis.

Current Trends in Bone Grafts - A Review

“…Finally, all of its properties must meet the standards of the relevant Agency or competent authority. The scaffold that can be employed for BTE applications should have the following characteristics: biological requirements (10), structural aspects (11), biomaterial composition (12), and manufacturing method types (13) (Figure 1).…”

“…The non-homogeneous structure of bone is another significant factor to consider. Multilayered, stratified, or gradient scaffolds, in this case, can better match the original structure (12). These biomaterials can be particularly effective when it comes to regenerating complex orthopedic interfaces, such as the osteochondral compartment.…”

Design And Digital Fabrication Technique of a Hybrid Framework - A Literature Review

“…This relationship however is not linear, since twice as many implants does not generate half as much force. This could be owing to the varying anatomy of bone, and the distribution of implants (37).…”

“…The passivity of the framework is fundamental to the success of the prosthesis and also for the underlying implants (37,38). Any misfit, clinically discernable or not is believed to induce internal stresses in the framework as well as the surrounding bone (28,37).…”

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“…Inadequate bone volume is one of the major challenges encountered by dentists when planning for a dental implant placement. Bone defects of the jaws are often related to trauma, surgical removal of malignant neoplasms or benign lesions or congenital anomalies like clefts or visceral skull bones hypoplasia, or as a sequel to periodontal lesions, tooth abscess or extraction and finally jaw atrophy due to advanced age or general disease (1). However the bone has a remarkable capacity to repair itself after encountering such causes, which are achieved through a dynamic process of remodelling, maturation, differentiation and controlled resorption.…”