Inclination of mandibular incisors and symphysis in severe skeletal class III malocclusion
Abstract Objective The aim of this study was to systematically explore the inclination of the lower central incisor and symphysis in alveolar bone in severe skeletal class III patients. Materials and methods A total of 198 severe skeletal class III patients (ANB ≤ -4°) who underwent combined orthodo...
| Main Authors: | , , , , , , |
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| Format: | Article |
| Language: | English |
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BMC
2023-05-01
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| Series: | Head & Face Medicine |
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| Online Access: | https://doi.org/10.1186/s13005-023-00361-6 |
| _version_ | 1797827322369277952 |
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| author | Jieni Zhang Yuqi Liang Rui Chen Si Chen Jiuxiang Lin Bing Han Xiaomo Liu |
| author_facet | Jieni Zhang Yuqi Liang Rui Chen Si Chen Jiuxiang Lin Bing Han Xiaomo Liu |
| author_sort | Jieni Zhang |
| collection | DOAJ |
| description | Abstract Objective The aim of this study was to systematically explore the inclination of the lower central incisor and symphysis in alveolar bone in severe skeletal class III patients. Materials and methods A total of 198 severe skeletal class III patients (ANB ≤ -4°) who underwent combined orthodontic and orthognathic treatment were divided into three groups based on the mandibular plane angle (MP-SN). Pretreatment lateral cephalograms were analysed and compared among the three groups. We also assessed cone-beam computed tomography (CBCT) images of 11 samples to investigate the reliability of the cephalometric analysis. Results ANOVA showed no statistically significant differences in the angle between the long axis of the mandibular symphysis and the long axis of the lower central incisor (MIA) among the low-angle, normal-angle and high-angle groups (P > 0.05), while significant differences were found in the angle between the axis of the lower incisor and the mandibular plane (IMPA) among the three groups (P < 0.001). The mean IMPA decreased with increasing MP-SN in the 198 patients. The mean MIA in the low-angle and normal-angle groups was 3.70° and 3.52°, respectively, while the value (2.33°) was smaller in the high-angle group. Paired-samples t test showed no statistically significant differences between the cephalometric and CBCT measurements of the MP-SN, the angle between the mandibular plane and the Frankfort plane (FH-MP) and the MIA (P > 0.05). Conclusions In severe skeletal class III patients, the long axis of the lower central incisor was highly consistent with the long axis of the mandibular symphysis, which was more obvious in the high-angle subjects. The MIA reflects the physiological inclination of the lower central incisor better than the IMPA. |
| first_indexed | 2024-04-09T12:46:04Z |
| format | Article |
| id | doaj.art-47e7d1a8c8704150896d0a234ff2b620 |
| institution | Directory Open Access Journal |
| issn | 1746-160X |
| language | English |
| last_indexed | 2024-04-09T12:46:04Z |
| publishDate | 2023-05-01 |
| publisher | BMC |
| record_format | Article |
| series | Head & Face Medicine |
| spelling | doaj.art-47e7d1a8c8704150896d0a234ff2b6202023-05-14T11:29:12ZengBMCHead & Face Medicine1746-160X2023-05-011911910.1186/s13005-023-00361-6Inclination of mandibular incisors and symphysis in severe skeletal class III malocclusionJieni Zhang0Yuqi Liang1Rui Chen2Si Chen3Jiuxiang Lin4Bing Han5Xiaomo Liu6Department of Orthodontics, Peking University School and Hospital of Stomatology & National Center for Stomatology & National Clinical Research Center for Oral Diseases & National Engineering Laboratory for Digital and Material Technology of Stomatology & Beijing Key Laboratory of Digital Stomatology & Research Center of Engineering and Technology for Computerized Dentistry Ministry of Health & NMPA Key Laboratory for Dental MaterialsDepartment of Orthodontics, Peking University School and Hospital of Stomatology & National Center for Stomatology & National Clinical Research Center for Oral Diseases & National Engineering Laboratory for Digital and Material Technology of Stomatology & Beijing Key Laboratory of Digital Stomatology & Research Center of Engineering and Technology for Computerized Dentistry Ministry of Health & NMPA Key Laboratory for Dental MaterialsYuncheng Stomatological HospitalDepartment of Orthodontics, Peking University School and Hospital of Stomatology & National Center for Stomatology & National Clinical Research Center for Oral Diseases & National Engineering Laboratory for Digital and Material Technology of Stomatology & Beijing Key Laboratory of Digital Stomatology & Research Center of Engineering and Technology for Computerized Dentistry Ministry of Health & NMPA Key Laboratory for Dental MaterialsDepartment of Orthodontics, Peking University School and Hospital of Stomatology & National Center for Stomatology & National Clinical Research Center for Oral Diseases & National Engineering Laboratory for Digital and Material Technology of Stomatology & Beijing Key Laboratory of Digital Stomatology & Research Center of Engineering and Technology for Computerized Dentistry Ministry of Health & NMPA Key Laboratory for Dental MaterialsDepartment of Orthodontics, Peking University School and Hospital of Stomatology & National Center for Stomatology & National Clinical Research Center for Oral Diseases & National Engineering Laboratory for Digital and Material Technology of Stomatology & Beijing Key Laboratory of Digital Stomatology & Research Center of Engineering and Technology for Computerized Dentistry Ministry of Health & NMPA Key Laboratory for Dental MaterialsDepartment of Orthodontics, Peking University School and Hospital of Stomatology & National Center for Stomatology & National Clinical Research Center for Oral Diseases & National Engineering Laboratory for Digital and Material Technology of Stomatology & Beijing Key Laboratory of Digital Stomatology & Research Center of Engineering and Technology for Computerized Dentistry Ministry of Health & NMPA Key Laboratory for Dental MaterialsAbstract Objective The aim of this study was to systematically explore the inclination of the lower central incisor and symphysis in alveolar bone in severe skeletal class III patients. Materials and methods A total of 198 severe skeletal class III patients (ANB ≤ -4°) who underwent combined orthodontic and orthognathic treatment were divided into three groups based on the mandibular plane angle (MP-SN). Pretreatment lateral cephalograms were analysed and compared among the three groups. We also assessed cone-beam computed tomography (CBCT) images of 11 samples to investigate the reliability of the cephalometric analysis. Results ANOVA showed no statistically significant differences in the angle between the long axis of the mandibular symphysis and the long axis of the lower central incisor (MIA) among the low-angle, normal-angle and high-angle groups (P > 0.05), while significant differences were found in the angle between the axis of the lower incisor and the mandibular plane (IMPA) among the three groups (P < 0.001). The mean IMPA decreased with increasing MP-SN in the 198 patients. The mean MIA in the low-angle and normal-angle groups was 3.70° and 3.52°, respectively, while the value (2.33°) was smaller in the high-angle group. Paired-samples t test showed no statistically significant differences between the cephalometric and CBCT measurements of the MP-SN, the angle between the mandibular plane and the Frankfort plane (FH-MP) and the MIA (P > 0.05). Conclusions In severe skeletal class III patients, the long axis of the lower central incisor was highly consistent with the long axis of the mandibular symphysis, which was more obvious in the high-angle subjects. The MIA reflects the physiological inclination of the lower central incisor better than the IMPA.https://doi.org/10.1186/s13005-023-00361-6Skeletal class III malocclusionLower incisorCephalometry |
| spellingShingle | Jieni Zhang Yuqi Liang Rui Chen Si Chen Jiuxiang Lin Bing Han Xiaomo Liu Inclination of mandibular incisors and symphysis in severe skeletal class III malocclusion Head & Face Medicine Skeletal class III malocclusion Lower incisor Cephalometry |
| title | Inclination of mandibular incisors and symphysis in severe skeletal class III malocclusion |
| title_full | Inclination of mandibular incisors and symphysis in severe skeletal class III malocclusion |
| title_fullStr | Inclination of mandibular incisors and symphysis in severe skeletal class III malocclusion |
| title_full_unstemmed | Inclination of mandibular incisors and symphysis in severe skeletal class III malocclusion |
| title_short | Inclination of mandibular incisors and symphysis in severe skeletal class III malocclusion |
| title_sort | inclination of mandibular incisors and symphysis in severe skeletal class iii malocclusion |
| topic | Skeletal class III malocclusion Lower incisor Cephalometry |
| url | https://doi.org/10.1186/s13005-023-00361-6 |
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