Impact of implant length and implantation depth on stress on type Ⅲ bone surrounding implant
Aim:To analyze the impact of implant length and implantation depth on the biomechanics of type Ⅲ bone surrounding implants using three-dimensional finite elements.Methods:Using modeling software such as Mimics,a platform transfer implant with diameter of 5 mm and length of 8 and 10 mm,respectively,were created for this experiment.The depth of the implant's neck platform was set as 0,1 mm,2 mm lower than the crest of the alveolar ridge,and there were 6 groups of three-dimensional models.Applying 225 N vertical and 200 N oblique loads to each model allowed researchers to examine the Von Mises stress/strain peak of the bone tissue around implants and distribution features.Results:The stress nepho-gram revealed that the stress/strain primarily focused in the bone surrounding the implant's neck platform.The implant's neck platform had the least stress/strain distribution in the cortical bone's apex region when it was positioned 1 mm below the crest of the alveolar ridge.As the implant's neck platform was moved lower under the same implant length,the stress/strain peak of the cortical bone first increased and then reduced,the stress/strain peak of the cancellous bone progressively increased,and the stress on the apex of the alveolar ridge gradually decreased.The stress/strain peak of the cancellous bone exceeded the upper limit of the safe range of physiological strength when the neck platform of the implant was placed 2 mm below the crest of the alveolar ridge.The stress/strain on the bone tissue surrounding the implant diminished as implant length increased.The depth of neck platform implantation had bigger impact on the surrounding bone stress than the length of the implant.Under the same conditions,the Von Mises stress/strain peak under oblique loading was larger than that under vertical loading.Conclusion:The mechanical results of implants with two implant lengths are similar,and the effect of im-plantation depth on the implant bone interface is greater than that of implant length.When the available height of the mandi-ble bone is constant,the implant with a length of 8 mm and an implantation depth of 1 mm is more conducive to remaining the surrounding bone and soft tissue.
implant lengthimplantation depthstressfinite element
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