Objective: To provide advice for the clinic application of titanium microscrew implant, we studied the effect of microscrew implant as anchorage and the influencing factors on the stability of microscrew implant.
Methods: A microscrew implant-upper dental arch 3-dimensional finite element model was established to simulate and evaluate the influence of microscrew implant insertion position and angle on the movement tendency of anterior teeth and the stability of microscrew implants. Also its effect of molar intrusion was studied and compared with a microscrew implant-TPA-upper dental arch finite element model. Depending on animal experiments, we analyzed the histology characteristics of the binding situation between the implant and the osseous tissue in different loading occasions. Clinical cases of microscrew implant were also studied.
Results: The decrease of vertical distance between microscrew implant insertion site and alveolar ridge crest and the increase of horizontal distance between the site and medial line of dental arch resulted in significant increase of lingual displacement and occlusal displacement of anterior teeth. The increase of angle formed by microscrew implant and alveolar bone profited the stability of microscrew implant. Loading group after two weeks since it had been implanted had better Osseo integration. And the molar can be intruded entirely by microscrew implant.
Conclusions: Microscrew implant can achieve good effects as anchorage. In order to attain the best therapeutic efficacy, we should choose the indications carefully in the clinical application.