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2022, Vol. 26 ›› Issue (6): 875-880Finite element analysis on the effect of implant length and diameter on initial stability under different bone conditionsGao Wenbo, Ma Zongmin, Li Shuxian, Nie Xiuji
Abstract: BACKGROUND: At present, there is no comprehensive study on the influence of bone quality, implant diameter, and length on initial stability. OBJECTIVE: The micromotion size of the implant-bone interface under load was used as the initial stability evaluation index to study the influence of bone quality, implant length, and diameter on the initial stability. METHODS: Mandibular models of bone types I, II, III, and IV were established, according to the bone classification method proposed by Zarb and Lekholm. Implant models with different diameters and lengths were established, referring to Straumann implant parameters. The implant diameters were 3.3, 4.1, and 4.8 mm; the lengths were 6, 8, 10, and 12 mm. Using the finite element method, the model was loaded with two typical chewing loads (100, 250 N), and the micromotion distribution of the implant-bone interface in each group of models was analyzed and compared under the two loads. The research plan was conducted in accordance with the Declaration of Helsinki and the relevant ethical requirements of the School of Mechanical Engineering, Dalian University. The subjects had fully informed consent and signed the “Informed Consent” for the collection of image data. RESULTS AND CONCLUSION: (1) The peak of the micromotion of the implant-bone interface appeared in the cortical bone area when the better bone jaws were loaded with a vertical load. The peak of the micromotion of the implant-bone interface appeared in the cancellous bone area when the poor bone jaws were loaded with a vertical load. Under oblique loading, the peaks of micromotion generated by the implant-bone interface in the four types of bone mandibles were all in the cortical bone area. (2) In the four loading modes, the initial stability of the implant decreased with the weakening of bone. The initial stability of the implant increased with the increase of the diameter and length of the implant; and the diameter of the implant had an effect on the initial stability of the implant and its influence was greater than that of the length. Key words:initial stability, micromotion, bone quality, implant diameter, implant length, finite element method, implant-bone interface, osseointegration |