Wei Fan1, De-Guo Gao2, Yu-Ting Wang1, Dan-Dan Li1, Zhen-Dong Wang1. 1. Jiangsu Key Laboratory of Oral Diseases, Nanjing Medical University, Nanjing 210000, China;Dept. of Orthodontics, Affiliated Hospital of Stomatological, Nanjing Medical University, Nanjing 210000, China. 2. Dept. of Orthodontics, Affiliated Hospital of Stomatological, Nanjing Medical University, Nanjing 210000, China;Dept. of Orthodontics, Zhenjiang Stomatological Hospital, Zhenjiang 212000, China.
Abstract
OBJECTIVE: To study the developmental and morphological characteristics of the mandible in patients with impacted mandibular second molar and to predict the possible trend of mandibular development via three-dimensional (3D) measurement and analysis. METHODS: A total of 88 cases of impacted group and 88 cases of control group were screened out. 3D measurements were performed by using Mimics software. A total of 23 landmark points and 17 measurements were determined. The measurements were analyzed by t-test. RESULTS: The mandible length, the space between the first molars, the space between mandibular angles, and the width between the first molars in the impacted group were lower than those in the control group (P<0.05). Moreover, the value of the submandibular angle was higher than that in the control group (P<0.05). CONCLUSIONS: The impacted mandible of patients with mandibular second molar showed lack of sagittal and width development, and the impacted mandibular second molar was a manifestation of its degeneration.
OBJECTIVE: To study the developmental and morphological characteristics of the mandible in patients with impacted mandibular second molar and to predict the possible trend of mandibular development via three-dimensional (3D) measurement and analysis. METHODS: A total of 88 cases of impacted group and 88 cases of control group were screened out. 3D measurements were performed by using Mimics software. A total of 23 landmark points and 17 measurements were determined. The measurements were analyzed by t-test. RESULTS: The mandible length, the space between the first molars, the space between mandibular angles, and the width between the first molars in the impacted group were lower than those in the control group (P<0.05). Moreover, the value of the submandibular angle was higher than that in the control group (P<0.05). CONCLUSIONS: The impacted mandible of patients with mandibular second molar showed lack of sagittal and width development, and the impacted mandibular second molar was a manifestation of its degeneration.
Entities:
Keywords:
degeneration; impacted mandibular second molar; mandible; three-dimensional measurement
Authors: Guilherme Thiesen; Maria Perpétua Mota Freitas; Eustáquio A Araújo; Bruno Frazão Gribel; Ki Beom Kim Journal: Am J Orthod Dentofacial Orthop Date: 2018-07 Impact factor: 2.650
Authors: Michael P Kelly; Houri K Vorperian; Yuan Wang; Katelyn K Tillman; Helen M Werner; Moo K Chung; Lindell R Gentry Journal: Arch Oral Biol Date: 2017-01-23 Impact factor: 2.633