Strain analysis of different diameter Morse taper implants under overloading compressive conditions

Abstract

The aim of this study was to evaluate the amount of deformation from compression caused by different diameters of Morse taper implants and the residual deformation after load removal. Thirty Morse taper implants lacking external threads were divided into 3 groups (n = 10) according to their diameter as follows: 3.5 mm, 4.0 mm and 5.0 mm. Two-piece abutments were fixed into the implants, and the samples were subjected to compressive axial loading up to 1500 N of force. During the test, one strain gauge remained fixed to the cervical portion of each implant to measure the strain variation. The strain values were recorded at two different time points: at the maximum load (1500 N) and 60 seconds after load removal. To calculate the strain at the implant/abutment interface, a mathematical formula was applied. Data were analyzed using a one-way Anova and Tukey's test (α = 0.05). The 5.0 mm diameter implant showed a significantly lower strain (650.5 μS ± 170.0) than the 4.0 mm group (1170.2 μS ± 374.7) and the 3.5 mm group (1388.1 μS ± 326.6) (p < 0.001), regardless of the load presence. The strain values decreased by approximately 50% after removal of the load, regardless of the implant diameter. The 5.0 mm implant showed a significantly lower strain at the implant/abutment interface (943.4 μS ± 504.5) than the 4.0 mm group (1057.4 μS ± 681.3) and the 3.5 mm group (1159.6 μS ± 425.9) (p < 0.001). According to the results of this study, the diameter influenced the strain around the internal and external walls of the cervical region of Morse taper implants; all diameters demonstrated clinically acceptable values of strain.

Analysis of Strain Distribution in Common Clinical Designs of Posterior Implant-Supported Fixed Partial Restorations: Comparison between Six Configurations

“…In two previous strain gauge analyses, it was reported that a vertical 1500 N load yielded the same strain at the implant neck as a 30 • angle 50 N load. Both experiments recorded 600 µs at the implant necks [32,33].…”

The effect of thermomechanical aging on the retention of a conometric system in a chewing simulator

“…In light of this, the increase in retention force after thermomechanical aging is thought to be caused by mechanical adaptation and cold fusion that occurred between the unsmooth surfaces of the abutments and caps as a result of pressure applied by 1200,000 mechanical cycles in the chewing simulator machine. Castro et al 28 employed a strain gauge and observed that compressive loading result in strain around the internal and external walls of the cervical regions of Morse taper implants. The strain was affected by the diameter of the Morse taper implants, with narrow implants subjected to more strain.…”

A strain gauge analysis comparing 4‐unit veneered zirconium dioxide implant‐borne fixed dental prosthesis on engaging and non‐engaging abutments before and after torque application

“…Complex strain fields around fixtures, implant components, or suprastructures could be typically measured using strain gauge analysis (Abduo, Bennani, Lyons, Waddell, & Swain, ; Abreu et al, ; Asvanund, ; Castro, Zancope, Verissimo, Soares, & Neves, ; Cehreli & Iplikcioglu, ; Cho et al, ; De Vasconcellos et al, ; De Vasconcellos, Nishioka, de Vasconcellos, Balducci, & Kojima, ; Heckmann et al, ; Hegde et al, ; Isidor, ; Karl, Rosch, Graef, Talyor, Heckmann, ; Karl, Graef, & Wichmann, ; Karl, Graef, Wichmann, & Krafft, ; Karl & Holst, ; Karl & Taylor, ; Karl, Wichmann, Heckmann, & Krafft, ; Nishioka, de Vasconcellos, & de Melo Nishioka, ; Nishioka, de Vasconcellos, Joias, & Rode Sde, ). With this method, an electrical resistance in the strain gauge enables the measurement of deformation with high sensitivity (μm/m) (Asvanund, ).…”