| Objective:The prevalence of the mandibular deviation and its clinical character; We analysedmandibular deviation by the panoramic radiogyaph and to evaluate the influce of thecondylar and ramus asymmetry to the mandibular asymmetry; we connected themeasurement of the dental arch and P-A and invested if the dental arch asymmetrywould cause facial asymmetry.The First Part Study of the prevalence and clinical characteristics of themandibular deviation in malocclusion in Tianjin1.Materials and methods: To survey 2384 patients, mals 672 and females 1712,2. Result:(1) The prevalence of the facial asymmetry is 2.6%.(2) There is significant difference between males and females.(3) In all malocclusions, the frequency of mandibular deviation is highest in Classâ…¢,then in Classâ… , the lowest in Classâ…¡.(4) In the individuals with mandibular deviation, the lower jaws are more frequentlyshifting to the left side than to the right side. The Second Part The correlation study of the condyle and ramus asymmetry tothe mandibular deviation1. Materials and methods: The study group includes 23 mandibular asymmetrypatients. The control group includes 23 natural normal occlusion standerd. Comparethe vertical length of the study group between left and right, and the same to thecontrol group.Besides, compare the asymmetry index between the two groups.2. Result: In study group,there is difference in the vertical length between twosides.But,in control group,there is no difference. Comparisons of the asymmetryindices between two groups, there is statistically significant difference for thecondylar and condylar+ramal indices.The Third Part The correlation study of the craniofacial characteristics inmandibular deviation:1.Materials and methods: The patients are also obtained from the orthodonticdepartment of the Tianjin stomatological hospital, males 9, females 12.2.Result: (1)Model analysis:The distance from cusps to the median palatal raphe indeviation side is larger than that of the contralateral side in maxilla.There isstatistically significant difference for the cuspid and the first biscuspid between twosides.The distance from cuspid to the midline in deviation side is smaller than that ofthe contralateral. There is statistically significant difference for the first biscuspid, thesecond biscuspid, the first molar between two sides.(2) P-A analysis:There is no difference between deviation side and opposite side inAnter, Lo, Zyg, Nas, there is significant difference between two sides in Mas, Go, Max.(3)The correlation between the dental arch deviation and facial deviation:Thereis no correlation between the upper dental arch and the lower dental arch.In the study,the correlation between the cuspid, the first molar and the Go of the mandibular issignificant, and the correlation between the second biscuspid, the first molar and themaxillar base is significant. 1. The prevalence of the facial asymmetry is 2.6%.It is lower than other region;Thereis significant difference between males and females.It is higher in males; In allmalocclusions, the frequency of mandibular deviation is highest in Classâ…¢, then inClassâ… , the lowest in Classâ…¡; In the individuals with mandibular deviation, the lowerjaws are more frequently shifting to the left side than to the right side; Mandibulardeviation always has posterior crossbite.2. In our study, the mandibular deviation chiefly reflects in the ramus; In mandibulardeviation, there is disharmony in the height of the condylar. In clinical, we should getrid of the elements that will cause the condylar shape rebuilding in time.3. In the upper arch, the distance from cuspid to the midline in deviation side is largerthan that of the contralatera; In the lower arch, the distance from cuspid to the midlinein deviation side is smaller than that of the contralatera;The deviation always shows inthe mandible. The maxillar base bone isn't evidently change;There is correlationbetween the arch deviation and the mandible asymmetry. It showes that the archdeviation will effect the mandible symmetry. |
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