Case Analysis Of Skeletal Class ? Malocclusion With Molar Impaction And Atretic Deep Overbite

Objective: To discuss orthodontic treatment of skeletal class III malocclusion with impacted the molar by extracting mandibular premolar and second molar and orthodontic treatment of atretic deep overbite with dentition crowding by extracting four premolars.To analyze the treatment plan and the effect of treatments and summarize the treatment points.Materials and Methods: Both cases were selected by the author during postgraduate study.First patient was a 15 years old and 10 days male whose chief complaint was anterior cross-bite.The main diagnoses include skeletal Class III,Angle Class II malocclusion,average angle,straight profile,reverse overbite of anterior and posterior tooth,first degree open bite between 14,45,46,21,22,32,first degree crowding of lower dentition and impacted teeth of 37.The treatment plans are to reduce 37,44,use the extraction space to retract the lower anterior tooth and correct the anterior crossbite and try to improve the profile,through the interaction of traction and vertical traction to correct posterior crossbite and individual tooth openbite.The second patient is a 20 years old and 11 months female whose chief complaint was irregular dentition.The main diagnoses include skeletal Class II,Angle I malocclusion,average angle,convex profile,third degree deep overbite,second degree crowding of upper dentition and third degree crowding of lower dentition.The treatment plans are to reduce 15,24,34,45,use the extraction space to align the dentition,establish occlusion neutral relationship and open the bite by lowering the anterior tooth.At the same time,four third molars were extracted to improve the stability of long-term effects.Result: In case one,after treatment overbite of anterior teeth is slightly shallow and overjet is normal.The overjet of left posterior teeth is shallow and is normal on the right.There were 1mm open bite between 13,14 and 45.The occlusal relationship is basically good.The profile is improved compared to that of pretreatment.In case two,after treatment,the patient acquired regular dentition,normal overbite,overjet and good occlusion.The gums of upper and lower anterior teeth did not shrink.Soft tissue of facial profile was improved.Conclusion: 1.The bad habit of the mandibular extension can cause the patients without the hereditary history of reverse overbite to develop into the true skeletal Class III malocclusion.2.11 to 14 years of age is the best time for treatment of impacted mandibular second molars.3.If you don't want to increase the upper lip protrusion when the atretic deep overbite patients recover the tip of upper anterior tooth,add a positive torque to the upper incisor area of the arch wire,and return to the end of the arch wire,cooperate with the intramaxillary traction or type II traction.The main effect of torque is lingual movement of the upper incisor roots.4.Angle Class II,division 2 malocclusion with atretic deep overbite patients can comprehensively analyze the possibility of advancement of the jaw after unblocking according to the growth and development status of patients and the use of the Pullinger formula to determine the extraction scheme and time.5.Prejudging on the susceptibility to black triangle in patients with moderate and severe dental crowding are beneficial to the formulation of the orthodontic plan to ensure the patient's treatment effect and satisfaction.