Biomechanical evaluation of stress distributions at the implant-abutment complex and peri-implant bone around mandibular dental implants with different neck geometries and inclinations

Abstract

This study aimed to investigate the effects of the different dental implant neck designs, diameters, and inclinations, on the stress distributions at the mandibular crestal bone and implant-abutment complex, using three-dimensional (3D) finite element stress analysis (FEA) method. Finite element models of three-unit fixed partial dentures supported with two same length implants (10 mm), placed on the second premolar and second molar regions, were designed. Eight different models were designed according to the implants’ neck designs (platform switching/traditional), diameters (4.1 mm/4.8 mm) and the tilting angles of the posterior implants (0°/15°). The anterior implants’ widths were 4.1 mm and the neck design of the anterior implants matched the posterior implants. Two types of 100-N loads in vertical and 30° oblique directions were applied separately onto each central fossae and functional cusps of the fixed partial dentures crowns. Algor Fempro Software was used for the simulation and evaluation of the stress levels at the implant-abutment complex and the crestal bone. Stress levels measured at the crestal bone were found to be lower for the platform switching models. However, the platform switching design generated higher stress magnitudes within the implant-abutment complex. Inclined placement of posterior implants increased the amount of stress at the crestal bone around both implants. Biomechanically, selection of the largest diameter possible when using tilted platform switched implants may be recommended at the posterior mandible.

In Silico Finite Element Analysis of Implant‐Supported CAD‐CAM Resin Composite Crowns

“…In contrast to the similar stress distributions observed throughout the model, even with different crown materials, differences were observed in the stress distribution in the crown‐abutment junction area. Local stress accumulation was detected in the junction regions in vertical (100N 26 and 300N 27 ) and oblique (150N 28 ) loading conditions. Various loading conditions are useful to identify the different stress modes under complex loading situations in oral environment.…”

Influence of different diameter reductions in the labial neck region on the stress distribution around custom‐made root‐analogue implants

“…It is a method used to analyse stresses and strains in complex mechanical systems [23], which has been widely used to study a number of dental biological research questions. In implantology, FEA has been used to evaluate the stress distributions at the implant-abutment complex and in the peri-implant bone around implants of different designs [24,25]. In prosthodontics, FEA has been used to evaluate the mechanical behaviour of different prosthetic solutions [26,27].…”

The impact of different cone-angle implant-abutment relationships on the long-term success of implant restorations

“…Maximum stress areas may be located at the implant neck, and possible overloading could occur in the form compression in the compact bone (due to lateral components of the occlusal load) and in the form tension at the interface between cortical and trabecular bone (due to vertical intrusive loading components) [93-95.]. Load transmission may also occur in the abutment-implant interface zone, which may also lead to the above mentioned phenomenon [96][97][98]. Our FEA analyses also confirmed that the implant-abutment connection greatly influences the distribution of forces in different ways at different heights between the implant and the bone.…”