Biomechanical evaluation of stress distribution in subcrestal placed platform-switched short dental implants in D4 bone: In vitro finite-element model study

Abstract

A BSTRACT The present study was carried out to assess stress distribution in the maxillary posterior bone region (D4 bone) with the help of a short platform switched subcrestal dental implants using the FEM model. Missing teeth surfaces related to the maxillary posterior region were stimulated. The bone model had a cancellous core of (0.5 mm) which represents D4 bone. A 7.5x4.6 mm screw type implant system with 3.5 platform switch abutment was selected. ANSYS WORKBENCH was used to model all the finite element structures. Force of 100 N was tested and adapted at an angle of 0º, 15º, 30º on the tooth model. Overall results from the current study showed that a high amount of stress was seen in cortical than in relation to cancellous bone. Stress values reduced from equicrestal to subcrestal (2 mm) placement of dental implants irrespective of angulation of load from 0o to 30o in both types of bone. However higher stress values were seen when force was applied in an oblique direction (30o) in comparison to a vertical load (0o). Least amount of stress was noticed when platform switched implants were placed 0.5 mm subcrestatlly irrespective of angulations of a load. Platform switched short subcrestal implants reduced the stress in the D4 cortical bone than in contrary equicrestal implant placement. This results in the preservation of marginal bone leading to implant success.

Influence of Dental Implant Diameter and Bone Quality on the Biomechanics of Single-Crown Restoration. A Finite Element Analysis

“…It should also be noted that the stress observed in the cases of angled loading was always much higher than those observed in the cases of axial loading, reaching a ninefold increase in the case of the Ø3.75 implant and Type 0-I bone quality. These results are in accordance with those reported by Sesha et al, who also observed higher bone stress when the load was applied with a 30° angulation compared to vertical loading [ 29 ]. Same findings were obtained by Papavasiliou et al, who concluded that stresses under oblique loading were approximately 10 times greater than under axial loading [ 30 ].…”

Biomechanical Evaluation of Stress Distribution in Equicrestal and Sub-crestally Placed, Platform-Switched Morse Taper Dental Implants in D3 Bone: Finite Element Analysis

“…Cortical bone, cancellous bone, and the implant with abutment were all assumed to be linearly elastic, homogeneous, and isotropic [ 11 ]. The corresponding elastic properties, such as Young’s modulus and Poisson’s ratio of cortical bone and implant, were determined according to a literature survey [ 7 ].…”

“…Dimensions and properties for cortical bone, trabecular bone, and titanium implants were assigned to models (Figure 1 ). Each solid component with isotropic, homogeneous, and linearly elastic behavior was assigned its Young's modulus and Poisson's ratio (Table 1 ) [ 7 ].…”

Stresses in lithium disilicate crowns and zirconia implants in patients with bruxism: An in silico study

“…Contrarily, the minimum principal stress was concentrated in the alveolar bone crest, yet with less intensity than in the SP-O group. The occurrence is due to the fact that the load was vertical and not oblique (Moura et al, 2020;Hong et al, 2020;Sesha et al, 2020). Due to the implant does not have a function in the study, this stress was dispersed through all the structure (Hajizadeh, Panahi, 2019;Brandão de Holanda et al, 2020).…”