Study on the morphological changes of condyles before and after orthognathic surgery in patients with skeletal class Ⅲ malocclusion and mandibular deviation
[Objective:] To examine the effects of orthognathic surgery on the condylar morphology in patients with skeletal class Ⅲ malocclusion and mandibular deviation, as well as the variations in condylar morphology and alterations in individuals with varying degrees of deviation. [Methods:] According to t...
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| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | zho |
| Published: |
Editorial Office of Journal of Oral and Maxillofacial Surgery
2024-08-01
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| Series: | Kouqiang hemian waike zazhi |
| Subjects: | |
| Online Access: | https://journal06.magtech.org.cn/Jweb_joms/EN/10.12439/kqhm.1005-4979.2024.04.005 |
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| Summary: | [Objective:] To examine the effects of orthognathic surgery on the condylar morphology in patients with skeletal class Ⅲ malocclusion and mandibular deviation, as well as the variations in condylar morphology and alterations in individuals with varying degrees of deviation. [Methods:] According to the value of menton deviation (MD), 20 patients with skeletal class Ⅲ malocclusion and mandibular deviation were selected, and then divided into group A (mild deviation group: 4 mm≤MD<10 mm) and group B (severe deviation group: MD≥10 mm), 10 cases in each group. Condyles were three-dimensionally reconstructed in Proplan CMF using the craniofacial spiral CT data from the T1 (before surgery) and T2 (six months after surgery) periods. Condylar morphological index (MI) was derived after reading the condylar volume and surface area. [Results:] Condyles in group A had a decrease in volume and surface area in T2 (P<0.05) on both the deviated side (DS) and the non-deviated side (NDS). For condylar volume, surface area, and MI during the T1 and T2 periods in each group: The NDS was larger than the DS, and the bilateral difference was statistically significant as group A is smaller than group B; the values of each index in group A were higher than those in group B, and there was a statistical difference in the DS (P<0.05). There was a statistical difference in the magnitude of changes in volume and surface area between the two groups on the DS (P<0.05), and the degree of condylar change between T2 and T1 is different. [Conclusion:] Condylar volume and surface area were reduced after orthognathic surgery, and statistically significant differences in condylar volume and surface area reduction were more pronounced in the mildly deviated group at 6 months postoperatively on the DS. Condylar volume, surface area, and MI were less than those on the NDS, and the DS indexes were higher in individuals with mild deviation than in individuals with severe deviation. The morphological changes of condyles after surgery were related to the degree of deviation. |
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| ISSN: | 1005-4979 |