ABSTRACT
Objective To aesthetically evaluate the mandible,to position the gonion landmark of the aesthetic female with digital techniques and to establish three-dimensional mandibular measurements database of the aesthetic female.Methods 14 aesthetic volunteers were chosen by plastic surgeons and ordinary people based on the identical view of esthetic mandible.The heads were scanned by a spiral CT scanner,and the data were imported into Mimics 18.0 to generate the 3D skull images.Distance,angle and ratio measurements,which could represented the aesthetic characters of the mandible,were made on the images.All the data were transferred into the SPSS 22.0 software to perform statistical analysis.A two-tailed t test was used to compare the symmetry of bilateral mandibles.Dynamic database of aesthetic mandibles was established.The mean,standard deviation,standard error and 95％ confidence interval of data were calculated by statistical software automatically.Results The results suggested that the mean of aesthetic mandibular angle was 123.91°,and the mean of mandibular plane angle was 27.03°.The ratio between the mandibular body and ramus approximated to 2 ∶ 1,and the ratio of the distance between gonion and mental foramen to ramus was close to 1.4.Conclusions The study of mandibular esthetics contributes to positioning the new gonion accurately for patients with prominent mandibular angle and gonion reconstruction,and it can assist surgeons in surgical designing,simulating and performing.