Abstract:

Objective To analyze the clinical data of the patients with non-syndromic supernumerary teeth （NSMST）， and to explore the possible mechanism of occurrence of supernumerary teeth， diagnostic criteria，and treatment method， and to enhance the comprehension of the clinicians about this disease. Methods The clinical data of one patient with NSMST were collected. Based on the specialist examination and relevant literature review results， the causes， diagnostic points and treatment principles of the supernumerary teeth were analysed. Results The patient， a 19-year-old male， checked in the clinic due to his subjective feeling of facial asymmetry， denying any systemic disease or history of genetic disorders. The intraoral examination results showed 4 supernumerary teeth， all of them showed the resembling molars morphology. The cone beam CT （CBCT） results showed that the roots of 4 erupted supernumerary teeth were fully developed. One impacted supernumerary tooth could be seen on the palatal root side of tooth 18， resembling a premolar， with fully developed roots， and there was a calcified crown shadow being observed distal mesially， and no root formation could be seen. The X-ray cephalometric analysis results showed a smaller SNB angle than the normal value， indicating the deficiency in the mandibular development； a larger FH-MP angle indicated a steep mandibular plane and high-angle pattern. There were a total of 6 supernumerary teeth on the right maxillary molar area， so the diagnosis was NSMST. The surgical extraction of the supernumerary teeth was recommended， followed by combined orthognathic-orthodontic treatment to restore normal facial morphology and dental arch form. The patient did not undergo treatment due to his personal reasons. Conclusion The NSMST patients needs to be definitely diagnosed through the imaging examinations clinically，the surgical removal is the principle treatment method，and early discovery and treatment can minimise the impact on the patient’s facial region and dentition.

Key words: Non-syndromic supernumerary teeth, Supernumerary teeth, Molar region, Adult, Dentition