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KMID : 0362720210590080430
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Journal of the Korean Dental Association
2021 Volume.59 No. 8 p.430 ~ p.438
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The longitudinal cephalometric study for positional change of maxillary and mandibular incisors according to three superimposition methods
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Park Hyo-Seon
Oh Min-Hee
Oh Hee-Soo
Cho Jin-Hyoung
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Abstract
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This study investigated the positional changes of maxillary and mandibular incisors during growth and the difference of positional changes according to the three superimposition methods. Lateral cephalographs including 10 subjects(7 males and 3 females) between 7-14 years old were used, which had been taken at University of California in San Francisco and kept at University of the Pacific. Four lateral cephalographs were selected based on chronologic age and development of dental occlusion. After tracing of cephalographs, superimposition was performed in three methods; based on cranial base, maxilla or mandible, and implants of maxilla and mandible. The repeated measure analysis of variance (ANOVA) and ANOVA with post-hoc analysis were performed. With growth, both maxillary and mandibular incisors showed changes in the anterior and downward directions, and the amount of positional changes was different according to the superimposition methods. As a result of comparing the changes of the upper and lower incisors according to three superimposition methods, the horizontal change of the upper incisor showed statistically significant differences between the three superimposition methods in all three periods. The change of the lower incisor showed a statistically significant difference only in the T3-T4 period, and no statistically significant difference in the other periods. In growing children, superimposition based on the facial bone shows that growth of the facial bones including the maxilla and mandible is contained together. This suggests that growth needs to be considered even when evaluating orthodontic treatment.
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KEYWORD
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Positional change of upper and lower incisor, use of intraosseous metallic implant
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