ObjectiveTo investigate the methods and significance of early orthodontic treatment for class Ⅱ malocclusion with molars scissors bite. MethodsTen patients with classⅡ malocclusion with molars scissors bite from 2011 and 2014 were selected. Study models and clinical data of them were retrospectively analyzed. Cephalometric radiographs taken before and after treatment were traced and measured. Student's t-test was used to analyze whether there was a significant difference before and after treatment. ResultsAfter treatment, the change of SNA, S-Go/N-Me, and soft tissue facial angle was not significant(P>0.05). SNB, N-ANS, ANS-Me, and S-Go increased significantly. ANB, Y axis, H angle, lower lip to H-line, and inferior sulcus to H-line decreased significantly(P<0.05). The treatment duration was 12 months on average. ConclusionEarly treatment of molars scissors bite and class Ⅱmalocclusion can keep the mandible and tempromandibular joint function well through occlusion guidance and muscle balance, which may prevent the exacerbation of facial deformity effectively.
ObjectiveTo discuss the clinical effects of micro implant anchorage combined with orthodontic positioning in the guided eruption of impacted maxilla anterior teeth. MethodsThirty-two patients with maxillary impacted teeth treated between 2010 and 2013 were selected, including 13 males and 19 females, aged from 13 to 26 years old, with an average age of (18.5±4.5) years. The extraction of the teeth and the local expansion of the extraction of the teeth were used to provide enough space for the impacted maxilla anterior teeth. The micro implant anchorage combined with orthodontic positioning was applied to treat 32 patients with 39 maxillary impacted teeth. Then, we observed the feasibility and efficacy of the therapeutic method. ResultsThe 39 impacted teeth were all successfully tracked and well aligned with good periodontal attachment. Pulp vitality test showed that 13 pulp reaction were retarded and 26 appeared normal. ConclusionThe micro implant anchorage combined with orthodontic positioning is effective in guided eruption of impacted anterior maxillary teeth.