Objective:To measure and analyse maxillofacial skeletal morphology based on the 3D model by Mimics and Matlab soft-ware.Methods:140 male volunteers aged 18-37 years,99 of Han,32 of Uygur and 9 of other natinalities were included.The values of maxillofacial skeletal morphology were measured by Mimics software combined with Matlab software after CT scanning.The data of skeletal morphologic features among skeletal classⅠ,Ⅱ and Ⅲ and among the ethnic groups were analysed with SPSS 26.0 software.Results:The distribution of skeletal class showed that there were 83 cases(59.3％)of class Ⅰ,41(29.3％)of class Ⅱ and 16(11％)of class Ⅲ.There were no significant differences on the age,height,nasal bone length,nasal bone depth,maxillary width,maxillary height,mandibular symphysis height,condylion distance and gonion distance among the 3 skeletal groups(P＞0.05).Skeletal class Ⅱshowed a significant shorter mandibular ramus,mandibular body and entire mandibular length compared with class Ⅰ and class Ⅲ,while class Ⅱ had a significant longer palatal length and larger Me angle compared with class Ⅲ(P＜0.05).Skeletal class Ⅲ showed no significance differences of all dimensions compared with class Ⅰ(P＞0.05).The nasal bone depth of Han subjects was smaller than that of Uygur,while the length of the mandibular symphysis and the entire mandible of Han group were greater than that of Uygur group(P＜0.05).No correlation was observed between age and all facial skeletal dimensions respectively(P＞0.05).The ANB an-gle is negatively correlated with the mandibular body(r=-0.327)and mandibular length(r=-0.322)respectively.Conclusion:There was no significant difference in nasal bone,facial bone width and facial bone height among the 3 skeletal patterns.Class Ⅱhas a significant shorter mandibular ramus,mandibular body and entire mandibular length.Uygur young males have significantly greater nasal bone depth than Han.

Objective:To measure and analyse maxillofacial skeletal morphology based on the 3D model by Mimics and Matlab soft-ware.Methods:140 male volunteers aged 18-37 years,99 of Han,32 of Uygur and 9 of other natinalities were included.The values of maxillofacial skeletal morphology were measured by Mimics software combined with Matlab software after CT scanning.The data of skeletal morphologic features among skeletal classⅠ,Ⅱ and Ⅲ and among the ethnic groups were analysed with SPSS 26.0 software.Results:The distribution of skeletal class showed that there were 83 cases(59.3％)of class Ⅰ,41(29.3％)of class Ⅱ and 16(11％)of class Ⅲ.There were no significant differences on the age,height,nasal bone length,nasal bone depth,maxillary width,maxillary height,mandibular symphysis height,condylion distance and gonion distance among the 3 skeletal groups(P＞0.05).Skeletal class Ⅱshowed a significant shorter mandibular ramus,mandibular body and entire mandibular length compared with class Ⅰ and class Ⅲ,while class Ⅱ had a significant longer palatal length and larger Me angle compared with class Ⅲ(P＜0.05).Skeletal class Ⅲ showed no significance differences of all dimensions compared with class Ⅰ(P＞0.05).The nasal bone depth of Han subjects was smaller than that of Uygur,while the length of the mandibular symphysis and the entire mandible of Han group were greater than that of Uygur group(P＜0.05).No correlation was observed between age and all facial skeletal dimensions respectively(P＞0.05).The ANB an-gle is negatively correlated with the mandibular body(r=-0.327)and mandibular length(r=-0.322)respectively.Conclusion:There was no significant difference in nasal bone,facial bone width and facial bone height among the 3 skeletal patterns.Class Ⅱhas a significant shorter mandibular ramus,mandibular body and entire mandibular length.Uygur young males have significantly greater nasal bone depth than Han.