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Cheol-Woo Park
, Sung-Hun Kim, In-Sung Yeo, Hyung-In Yoon, Jung-Suk Han
, Sung-Hun Kim, In-Sung Yeo, Hyung-In Yoon, Jung-Suk Han
Abstract
Purpose
The purpose of this study was to investigate the effects of the insertion depth of an immediately loaded implant on the stress distribution of the surrounding bone and the micromovement of the implant using the three-dimensional finite element analysis.
Materials and methods
A total of five bone models were constructed such that the implant platform was positioned at the levels of 0.00 mm, 0.25 mm, 0.50 mm, 0.75 mm, and 1.00 mm depth from the crest of the cortical bone. A frictional coefficient of 0.3 and the insertion torque of 35 Ncm were simulated on the interface between the implant and surrounding bone. A static load of 178 N was applied to the provisional prosthesis with a vertical load in the axial direction and an oblique load at 30°with respect to the central axis of the implant, then a finite element analysis was performed.
Figures and Tables
Fig. 1
Representative illustration of 5 different bone models. Implant platform (red line) was positioned at depths of 0.00 mm (A), 0.25 mm (B), 0.50 mm (C), 0.75 mm (D), 1.00 mm (E) from the crest of the cortical bone.
Fig. 2
Loading condition. The static load (178 N) was applied to the provisional prosthesis. (A) vertical load, (B) oblique load, θ = 30°.
Fig. 3
Stress distributions in peri-implant bone before loading. The stress was concentrated in a close and narrow area along the thread of the implant and similar on the labial and palatal side. (A) 0.00 mm, (B) 0.25 mm, (C) 0.50 mm, (D) 0.75 mm, (E) 1.00 mm.
Fig. 4
Stress distributions in peri-implant bone under vertical loading. The stress was distributed widely and the area of stress concentration in the crest of the cortical bone gradually decreased as the insertion depth increased. (A) 0.00 mm, (B) 0.25 mm, (C) 0.50 mm, (D) 0.75 mm, (E) 1.00 mm.
Fig. 5
Stress distributions in the peri-implant bone under oblique loading. The stress was concentrated on the labial side of the cortical bone, and the area of high stress concentration shifted more and more apically as the insertion depth increased. (A) 0.00 mm, (B) 0.25 mm, (C) 0.50 mm, (D) 0.75 mm, (E) 1.00 mm.
Table 2
Maximum and average values of von Mises stress in peri-implant bone according to different insertion depths before loading (unit: MPa)
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