Does the transversal screw design increase the risk of mechanical complications in dental implants? A finite elements analysis

Abstract

The transversal screw was introduced in order to overcome some disadvantages of the transocclusal screw. However, its mechanical risk has not been studied sufficiently. The main purpose of this research was to assess and compare stress distribution in the screws and abutment of a single-crown implant with transversal and transocclusal screw models. Two 3D models were assembled to analyse a single-implant-supported prosthesis with transversal and transocclusal screws embedded in the jawbone. The crown was subjected to a static load of value 300 N with different levels of inclination. The transversal screw model, with an axial load of 15°, was the one with lowest stress values in all its components. However, the stress was greater with more inclined loads

A Dual Discriminator Adversarial Learning Approach for Dental Occlusal Surface Reconstruction

“…Considering that each tooth has the same characteristic shape as its standard tooth of the same name, bionic geometry morphology design-based methods tend to adopt the standard dental to design crown [ 12 , 42 ]. In the process of crown design, occlusal fingerprint is necessary to fully reflect the functional characteristics of the occlusal surface since it provides reference for the position and direction of the correct occlusal contacts [ 43 ]. If the occlusal fingerprint distribution is not considered during the design process, there will be a large amount of unreasonable interference areas on the designed crown.…”

Effect of crown retention systems and loading direction on the stress magnitude of posterior implant-supported restorations: A 3D-FEA

“…Despite that, experimental and clinical studies with Lateral-screw-retained implant design showed insufficient proof of the treatment reliability. In addition, to allow the screw to tighten with adequate torque, it was recommended that the crown should present at least the lingual face in metal, without esthetic veneering, since the lateral screw required fixation in both crown and abutment [ [11] , [12] , [13] , [14] , [15] ].…”

“…The mechanical benefits of using an extra component (lateral screw) in the prosthesis setup should be better addressed, demonstrating the reduction of stress magnitude and increasing the safety factor for fracture incidence. A previous finite element analysis reported that the conventional prosthetic transversal screw is an option to reduce the risk of mechanical complications, both in the prosthetic screw and in the abutment screw [ 15 ]. However, both models considered in the reported investigation presented a lateral screw, and the comparison with the conventional cement-retained and screw-retained designs was not performed [ 14 , 15 ].…”

“…A previous finite element analysis reported that the conventional prosthetic transversal screw is an option to reduce the risk of mechanical complications, both in the prosthetic screw and in the abutment screw [ 15 ]. However, both models considered in the reported investigation presented a lateral screw, and the comparison with the conventional cement-retained and screw-retained designs was not performed [ 14 , 15 ]. Therefore, the present study aimed to assess and compare the stress distribution in four different crown retention types for single-crown implant designs (cement-retained, screw-retained, lateral-screw retained, and modified lateral-screw retained) during axial and non-axial loading.…”

The Effect on Bone Stress in Oral Prosthetic Rehabilitation Supported by Different Number of Dental Implants: A Numerical Analysis

“…Detecting stress on implant-supported prostheses and analyzing its distribution to the implants have a fundamental importance for the evaluation of both the stresses applied on the implants and the design of the structure. It is important to evaluate different stresses generated on the implants by different loads [6,7].…”