Finite element analysis of cortical bone strain induced by self-drilling placement of orthodontic microimplant

Jin-Seo Park; Wonjae Yu; Hee-Moon Kyung; Oh-Won Kwon

doi:10.4041/kjod.2009.39.4.203

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Park, Yu, Kyung, and Kwon: Finite element analysis of cortical bone strain induced by self-drilling placement of orthodontic microimplant

Original Article

Korean Journal of Orthodontics

Korean Journal of Orthodontics 2009; 39(4): 203-212.

Published online: 31 August 2009

DOI: https://doi.org/10.4041/kjod.2009.39.4.203

Finite element analysis of cortical bone strain induced by self-drilling placement of orthodontic microimplant

Jin-Seo Park, DDS, MSD^a, Wonjae Yu, DDS, MS, PhD^b, Hee-Moon Kyung, DDS, MSD, PhD^c, Oh-Won Kwon, DDS, MSD, PhD^c

^aGraduate Student, Department of Orthodontics, School of Dentistry, Kyungpook National University, Korea.

^bAssociate Professor, Department of Orthodontics, School of Dentistry, Kyungpook National University, Korea.

^cProfessor, Department of Orthodontics, School of Dentistry, Kyungpook National University, Korea.

Corresponding author: Wonjae Yu. Department of Orthodontics, School of Dentistry, Kyungpook National University, 188-1, Samduk-dong 2-ga, Jung-gu, Daegu 700-412, Korea. +82 53 420 4991; wonjaeyu@knu.ac.kr

Received 29 January 2009 Revised 1 July 2009 Accepted 4 July 2009

Abstract

Objective

The aim of this study was to evaluate the strain induced in the cortical bone surrounding an orthodontic microimplant during insertion in a self-drilling manner.

Methods

A 3D finite element method was used to simulate the insertion of a microimplant (AbsoAnchor SH1312-7, Dentos Co., Daegu, Korea) into 1 mm thick cortical bone. The shape and dimension of thread groove in the center of the cortical bone produced by the cutting flute at the apical of the microimplant was obtained from animal test using rabbit tibias. A total of 3,600 analysis steps was used to calculate the 10 turns and 5 mm advancement of the microimplant. A series of remesh in the cortical bone was allowed to accommodate the change in the geometry accompanied by the implant insertion.

Results

Bone strains of well higher than 4,000 microstrain, the reported upper limit for normal bone remodeling, were observed in the peri-implant bone along the whole length of the microimplant. Level of strains in the vicinity of either the screw tip or the valley part were similar.

Conclusions

Bone strains from a microimplant insertion in a self-drilling manner might have a negative impact on the physiological remodeling of cortical bone.

Keywords: Microimplant, Self drilling placement, Strain during insertion, 3D finite element method

Figures and Tables

Fig 1

Geometry of microimplant, cortical bone specimen and the axis system together with important dimensions: A, geometry (unit: mm); B, initial mesh of the cortical bone constructed with 48,921 tetrahedral elements.

Fig 2

Cortical bone: A, 3D image reconstructed from micro CT data; B, A-A' aspect shown in A with detailed dimensions of thread groove. 0.3 mm chamfer was placed at the entrance of the implant bed to avoid numerical instability during FE analysis.

Fig 3

Material property of cortical bone used in the present study (cf. Table 1).

Fig 4

Strain (radial strain) distribution in the cortical bone at 9 separate stages of implant insertion (cut off strain: 4,000µ-strain). A, Step 720 (2 turns); B, step 1,080 (3 turns); C, step 1,440 (4 turns); D, step 1,800 (5 turns); E, step 2,160 (6 turns); F, step 2,520 (7 turns); G, step 2,880 (8 turns), H, step 3,240 (9 turns); I, step 3,600 (10 turns).

Fig 5

Development of strain (radial strain) with the course of microimplant insertion, monitored at 7 reference points. A, Location of the reference points within section A-A' (see Fig 2); B, comparison of the strains at each of 7 reference points.

Fig 6

Strain (radial strain) distribution in the cortical bone at 9 separate stages of implant insertion (cut off strain: 40,000µ-strain). A, Step 720 (2 turns); B, step 1,080 (3 turns); C, step 1,440 (4 turns); D, step 1,800 (5 turns); E, step 2,160 (6 turns); F, step 2,520 (7 turns); G, step 2,880 (8 turns), H, step 3,240 (9 turns); I, step 3,600 (10 turns).

Table 1

Mechanical properties (bone and implant materials)

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