安氏Ⅲ类与Ⅰ类错牙合畸形牙弓与基骨弓宽度协调性的锥形束CT对比研究

Abstract

Abstract: [Abstract] Objective: To analyze the coordination between the widths of dental and basal bone arches in Class III and Class I malocclusion using cone-beam CT (CBCT). Methods: Sixty patients (18-30 y), including 30 cases each of Class III and Class I, were selected to collect CBCT scans and perform three-dimensional imaging to measure the dental arch widths of the maxillary and mandibular cuspid, premolar and molar regions and the corresponding basal bone arch widths. the differences between the dental arch widths in the same tooth sites and the basal bone arch widths were calculated. The difference between the width of the dental arch and the basal bone arch was compared between Class III and Class I malocclusion. Results: The dental arch width of the first maxillary molar was significantly greater in Class III than in Class I (P<0.05), and there was no difference between the dental arch widths of the maxillary cuspids and the first premolars(P>0.05); the dental arch widths of the mandibular cuspids and the first molars were significantly greater in Class III than in Class I (P<0.05), and there was no difference between the dental arch widths of the mandibular first molars(P>0.05). The basal bone arch width of the maxillary first premolars was significantly smaller in Class III than in Class I(P<0.05), and the basal bone arch width of the maxillary cuspids and first molars were not different (P>0.05);the basal bone arch widths of all the mandibular tooth sites were significantly greater in Class III than in Class I(P<0.05). In the maxilla, except for the cuspid site, the difference between the dental arch and the basal bone arch widths in Class III was significantly greater than in Class I (P<0.05); in the mandible, except for the first molar site, the difference between the dental arch and the basal bone arch widths in Class III was significantly smaller than in Class I (P<0.05). Conclusions: By comparing the results of the difference between the dental arch and the basal bone arch widths in Class III and Class I malocclusion, during the treatment of Class III malocclusion, we can increase the maxillary basal bone arch width in the posterior region to improve the coordination of the dental arch and the basal bone arch widhs, and increase the mandibular dental arch width in the posterior region to improve the coordination of the dental arch and the basal bone arch widths.

Key words: malocclusion, class III, class I, dental arch width, basal bone arch width, cone beam CT

References

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The comparative study of the coordination of the width between dental arch and basal bone arch in Class Ⅲ and Class Ⅰ malocclusion

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