| Objective: To discuss the clinical effects of camouflage orthodontic treatment of skeletal class III malocclusion with overbite of incisors in youth.Method: An adolescent male patient with skeletal class III malocclusion with overbite of incisors was selected from the stomatology department of the second affiliated hospital of Dalian Medical University in June 2014. The patient was 16 years old with permanent teeth dentition. The relationship of molar was medial relationship, namely Class Ⅲ.The relationship of canine on both side was also medial relationship. The relationship of Anterior teeth was overbite with shallow overjet. There was no crowding on both upper and lower dentation. The midline in upper was normal, while the lower midline shifted to 1mm on the left. There was a flat Curve of Spee. The shape of the dentation on upper was square and round and lower was pointed round. The shape and the position of the tongue was as normal as the other soft tissue. Oral hygiene was general. From the frontal view the position of pogonion was in the middle. The midface region was symmetrical and proportional. The lateral profile was straight with slightly dysplastic maxillary and normal mandibular growth. After the analysis of the clinical examination, the model analysis and cephalometric analysis of the patient, the camouflage orthodontic treatment with non-surgery was suggested. Treatment involved non-extraction of upper or lower teeth and fixed appliance. As time as leveling, upper anterior teeth moved forward and restricted the lower incisors to remove the overbite relationship, cover the inharmonious, establish the normal anterior bite relationship and molar relationship. Keep the upper midline and readjust the lower midline. Remove theocclusal interference to make a stable occlusion. Use the triangle elastic during the late treatment to adjust the occlusal relationship. Observation of the changes between pre-treatment and post-treatment through lateral cephalometric values and model analysis and the curative effect of the treatment were discussed after finishing.Result: The active treatment period was 7 months.(1)The facial profile improved and good occlusion achieved, and confirmed by SNA angle altered from 74.77°to 75.64°,SNB angle altered from 79.87 ° to 78.70 °, A-NaPerp. increased from-6.71 mm to-5.97 mm, Po-NaPerp. altered from-1.15 mm to-3.67 mm, Co-Gn unchanged, Co-A increased from 83.57 mm to 86.87 mm, ANB angle increased from-5.01 ° to-3.06°,Wits appraisal increased from-15.60 mm to-7.17 mm, the base skeletal position of maxillary and mandible was slightly improved. APDI angle altered from 99.89°to94.81 °, skeletal class Ⅲ relationship improved, ODI angle unchanged.(2)U1-SN angle increased 8.70°,U1-NA increased 1.87 mm, U1-NA angle increased 7.83°, the camouflage treatment was compensatory of the upper incisor labial inclination to improve the anterior crossbite.(3)P-UL altered from-4.10 mm to-1.97, P-LL unchanged, ULP altered from 6.65 mm to 8.67, LLP unchanged. After the treatment the profile of the patient was kept straight, the short of the upper lip was improved and the patient was satisfied with the treatment.Conclusion:(1)The treatment of lightly skeletal class III malocclusion with anterior overbite in youth was changing the position of teeth to rebuild the normal anterior bite relationship, obtain the Compensatory of the abnormal skeletal development and stable occlusion and achieve the purpose of the treatment.(2) The development of Maxillary was restrict with overgrowth of mandible due to the anterior overbite. Therefore,removing the anterior overbite as soon as possible was an effective way to reverse the situation. Especially for skeletal class III malocclusion with anterior overbite young patients, who did not reach the age of surgery, camouflage orthodontic treatment was the best choice for the youth of skeletal class III malocclusion with overbite of incisors. |
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