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Three-dimensional analysis of mandibular characteristics in patients with skeletal Class II malocclusion and chin deviation.
Lv, Wenxin; Nie, Qiong; Gu, Yan.
Affiliation
  • Lv W; Department of Orthodontics, National Engineering Laboratory for Digital and Material Technology of Stomatology, and Beijing Key Laboratory of Digital Stomatology, Peking University School and Hospital of Stomatology, Beijing, China.
  • Nie Q; Department of Orthodontics, National Engineering Laboratory for Digital and Material Technology of Stomatology, and Beijing Key Laboratory of Digital Stomatology, Peking University School and Hospital of Stomatology, Beijing, China. Electronic address: qiongnie@yahoo.com.
  • Gu Y; Department of Orthodontics, National Engineering Laboratory for Digital and Material Technology of Stomatology, and Beijing Key Laboratory of Digital Stomatology, Peking University School and Hospital of Stomatology, Beijing, China.
Am J Orthod Dentofacial Orthop ; 160(3): 392-400, 2021 Sep.
Article in En | MEDLINE | ID: mdl-34175163
INTRODUCTION: This study aimed to analyze adults with mandibular characteristics of skeletal Class II malocclusion with chin deviation. METHODS: Seventy-five adult patients aged from 18 to 35 years were included and divided into 3 groups on the basis of sagittal skeletal pattern and chin deviation: skeletal Class I symmetry group, skeletal Class II symmetry group, and skeletal Class II asymmetry group (25 patients per group). Mandibular measurements on cone-beam computed tomography images were performed, and the differences between 2 sides in each group and the differences among the 3 groups were investigated. RESULTS: Compared with the contralateral side, the deviated side of patients in the Class II asymmetry group showed significantly smaller condyle angle to midsagittal plane, condylar height, ramal length, and length of the mandibular body, whereas it showed a significantly larger distance from condylion to the midsagittal plane, ramus angle to the horizontal plane, and distance from gonion to the midsagittal plane. Most linear measurements in the Class II symmetry group were significantly smaller than those in the Class I symmetry group. These linear measurements on the contralateral side of the Class II asymmetry group showed no significant difference with the Class I symmetry group, and these measurements on the deviated side of the Class II asymmetry group showed no significant difference with the Class II symmetry group. CONCLUSIONS: Length of the mandible, rotation of condyle, the inclination of the ramus, and position of gonion should be considered in subjects with skeletal Class II asymmetry when making diagnosis and treatment planning.
Subject(s)

Full text: 1 Collection: 01-internacional Database: MEDLINE Main subject: Malocclusion, Angle Class II / Malocclusion, Angle Class III Limits: Adult / Humans Language: En Journal: Am J Orthod Dentofacial Orthop Journal subject: ODONTOLOGIA / ORTODONTIA Year: 2021 Document type: Article Affiliation country: China Country of publication: United States

Full text: 1 Collection: 01-internacional Database: MEDLINE Main subject: Malocclusion, Angle Class II / Malocclusion, Angle Class III Limits: Adult / Humans Language: En Journal: Am J Orthod Dentofacial Orthop Journal subject: ODONTOLOGIA / ORTODONTIA Year: 2021 Document type: Article Affiliation country: China Country of publication: United States