Abstract:

Objective Basing on the three-dimensional reconstruction of jaw bone data, a template was designed for the guide of implantation of miniscrew. It’s postoperative accuracy and clinical results were also evaluated. Methods The CT scan was performed on 30 patients who needed imbed implant anchorage. Basing on the data, three-dimensional model was reconstructed and the location of implant was determined. The location plates basing on the labial and palatal surface data and guide tube that can be assembled were designed. All data we obtained were output to make to resin template using rapid prototype technology. One side of each patient’s maxillary were randomly selected to imbed miniscrew by using three-dimensional model. The other side located miniscrew by X ray film. The effect of template were evaluated during 5-7 months treatment. Results The template we designed can do the stable guide. The miniscrew can reach the exact place as anticipated designed. After 5-7 months of clinical observation, 30 miniscrew position and orientation of experimental group consistent with the preoperative design, and no contact with adjacent teeth. A case of failure according to the interference by soft tissues, and the success rate was 96.7%. There were 23 miniscrew stability and 7 loosening in the control group. The success rate was 76.7%. Conclusion The miniscrew can be implanted accurately to the optimal location with three-dimensional guide and decrease the failure rate of implant anchorage.

Key words: miniscrew, three-dimensional guide, implant anchorage