[Clinical analysis of 309 patients with 2 supernumerary teeth in the upper incisor area].

Purpose: To analyze and summarize the clinical characteristics of patients with two supernumerary teeth in the upper incisor area, in order to provide reference for clinical diagnosis and treatment.

Methods: A total of 309 patients with two supernumerary teeth in the upper incisor area who were admitted to Hospital of Stomatology, Hebei Medical University from January 2017 to December 2021 were collected, their age, gender, reasons for medical treatment, and related information on supernumerary teeth were statistically analyzed. The growth direction, eruption status, morphology, and development of supernumerary teeth in different genders and age groups were grouped and analyzed. SPSS 21.0 software package was used for data analysis.

Results: Among 309 patients, the average age was (8.21±3.89) years old, and the male to female ratio was 3.83∶1. The 6-12 years old group had the highest number of visits, with 205 cases (66.34%); 204 cases (66.02%) had 2 supernumerary teeth with inconsistent growth directions, 223 cases (72.17%) had 2 supernumerary teeth with inconsistent morphology, 194 cases (62.78%) had 2 supernumerary teeth with fully developed roots, 174 cases (56.31%) had 2 supernumerary teeth in an unexpired state. There was no significant difference(P＞0.05) in the growth direction, eruption status, development, treatment reasons, and impact on adjacent tissues between the two supernumerary teeth of different genders, but there was significant difference(P＜0.05) in morphology. There was significant difference in the growth direction of two supernumerary teeth in different age groups(P＞0.05), but there were significant differences in eruption status, morphology, development, medical reasons, and impact on adjacent tissues(P＜0.05).

Conclusions: Patients with two supernumerary teeth in the upper incisor area are mostly seen in the mixed dentition period. The incidence rate of males is significantly higher than that of females. Gender has certain impact on the morphology of supernumerary teeth, and age has certain impact on the eruption, morphology, and development of supernumerary teeth.