Biomechanical analysis of different implant-abutments interfaces in different bone types: An in silico analysis

Abstract

The purpose of this study was to analyze the stress distribution of bone tissue around implants with different implant-abutment interfaces: platform switching (PSW); external hexagon (EH) and Morse taper (MT) with different diameters (regular: Ø 4 mm and wide: Ø 5 mm), bone types (I-IV) and subjected to axial and oblique load conditions using three-dimensional finite element analysis (3D-FEA). Sixteen 3D models of various configurations were simulated using InVesalius, Rhinoceros 3D 4.0, and SolidWorks 2011 software, and processed using Femap 11.2 and NeiNastran 11.0 programs. Axial and oblique forces of 200 N and 100 N, respectively, applied at the occlusal surface of prostheses. Maximum principal stress values were obtained from the peri-implant cortical bone of each model. Statistical analyses were performed using ANOVA and Tukey's test for maximum principal stress values. Oblique loading showed higher tensile stress than axial loading (P < 0.001). Wide-diameter implants showed lower stress concentration rather than regular-diameter implants, regardless of both connection and bone type (P < 0.001). Under axial loading, wide-diameter EH implants with regular platforms showed more favorable stress distribution than PSW implants for axial loading (P < 0.001); however, under oblique loading, PSW implants exhibited lower stress concentrations (P < 0.001). Regular-diameter MT implants showed lower stress than EH implants (P < 0.001). Bone type IV showed higher stress in the cortical region than bone types I and II (P < 0.001), but no significant difference when compared with bone type III (P > 0.05). The conclusion drawn from this in silico is that MT implants should be considered for use in situations that preclude the placement of wide-diameter implants, particularly where bone types III and IV are concerned.

Splinted and Nonsplinted Crowns with Different Implant Lengths in the Posterior Maxilla by Three-Dimensional Finite Element Analysis

“…This study assessed the effect of splinted crowns and implant length of Morse taper because this connection type exhibits better biomechanical behavior than other connections [17, 18], contributing to bone preservation [19, 20] and lower complications rates [21]. Furthermore, cemented crowns were simulated in this study because they exhibit better biomechanical behavior with Morse taper implants [16] and contribute to greater preservation of the bone tissue, compared with the screwed crown [22].…”

“…Thus, the second null hypothesis was accepted. Some factors may contribute to similarity in stress in short implants compared with standard implants, such as the implant connection used [17, 18], cemented crowns [22, 29], and subcrestal implants [30] which may contribute to the reduction of stress on the structures. Furthermore, the differences in the implants length were small (11.5, 10, 8.5, and 7 mm).…”

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

“…The models were subjected to an axial load of 100 N distributed throughout the region on the cantilever from the distal implant with reference to the midline and to a 30 N axial load on the implants in the inter-foramen region, both in model 1 and in model 2, as shown in Figure 3. [10,11]. Regarding the bar, the height was 7 mm, with a cantilever length of 14 mm.…”

“…A complete osseointegration was added to both the trabecular and the cortical bone with the implant [9]. The models were subjected to an axial load of 100 N distributed throughout the region on the cantilever from the distal implant with reference to the midline and to a 30 N axial load on the implants in the inter-foramen region, both in model 1 and in model 2, as shown in Figure 3 [10,11]. A symmetry in the median sagittal plane and a fixed support in the posterior surface were considered as boundary conditions in both models.…”

Does the implant-abutment interface interfere on marginal bone loss? A systematic review and meta-analysis

“…13 This implant design, however, favors the concentration of high amount of force over the screw and leads to micromovement generation, that combined, typically results in the subsequent critical failure of the implants due to mechanical and biological reasons. 14,15 To solve this problem, new connection designs were developed, that resulted in a classification division between tapered and non-tapered and internal and external abutments. 16 The internal tapered connection (IC) provides a juxtaposition (by attrition) and superior mechanical stability that eliminates unwanted rotation and pillar loosening.…”