1. Impacted tooth is a common disease in dental clinics.

2. Impacted tooth is frequent disease of oral section.

3. VR directly displayed the three-dimensional position of the impacted tooth and its relationship with the adjacent teeth.

4. Methods Fifty-nine patients with impacted tooth were taken transverse tomography by SIEMENS panoramic machine.

5. Traditionally, the impacted tooth should be extracted first, and the implant insertion to be performed after the wound is completely healed.

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6. But biomechanical mechanism on traction of impacted tooth is not clear.

7. Objective To analyze stress around the impacted tooth by constituting a 3-dimensional finite element model of impacted tooth , consequently offer reference basis for clinic traction treatment.

8. MIP displayed the anatomic structure of the impacted tooth and the bone density around it.

9. Impacted tooth frequently appears in upper cuspid and upper central incisors(except of the third molar) .

10. This article presents a 13-year-old female patient with an impacted maxillary second premolar which is incomplete root formation. The impacted tooth was surgically repositioned to normal occlusion.

11. Objective To discuss the value of transverse tomographic technique in the location of impacted tooth in the anterior maxillary.

12. Objective To explore a new method of fabricating attachment bonded to impacted tooth using rapid prototyping.

13. Methods By comparatively analyzing tomograms of Spiral CT and curve fault for 18 maxillofacial fracture and 5 impacted tooth patients.

14. Results MPR was able to demonstrate the relative bone intensity around the implanted tooth and exactly determine the distance of impacted tooth with the buccolingual bone wall or adjacent teeth.

15. Results 14 patients were localized successfully, and one patient was failing because the distance between the impacted tooth and the reference tooth is too close to differentiate.

16. The X-ray photographs of 400 cases of mandbular impacted third molar were observed and the impacted molar types and relations between impacted types and complications of impacted tooth were analysed.