ABSTRACT
PURPOSE: To investigate the effect of non-extraction orthodontic treatment on the changes of chin morphology in Angle Class II division 2 malocclusion patients without tooth extractions. METHODS: A total of 20 patients with Class II division 2 malocclusion were treated with MBT straight wire appliance. Cephalometrics analysis was performed before and after treatment. The chin morphology, the position of the incisors and the profile before and after orthodontic treatment were included in the analysis. The data was analysed statistically with PASW statistics18. RESULTS: With the correction of the lingually inclined maxillary incisors, the mandibular plane moved anteroinferiorly and the anterior lower facial height increased.The chin moved forward, with introcession, the depth of the mentolabial sulcus and the chin projection decreased. Upper lip-E line and lower lip-E line became normal or close to normal. All cases showed a better improvement of the profile after treatment(P<0.05). CONCLUSIONS: In Class II division 2 malocclusion patients, after the lingually inclined maxillary incisors were corrected,the chin position could be orthodontically changed and soft tissue profile will be more esthetical.
Subject(s)
Cephalometry , Chin , Dental Care , Face , Humans , Incisor , Lip , Malocclusion, Angle Class II , Tooth ExtractionABSTRACT
OBJECTIVE: To observe the movement of rat's tooth in the area of defective alveolar bone filled with bioglass in comparison with contralateral tooth. METHODS: Forty female Wistar rats were selected. Defects in alveolar bones were created and filled with bioglass. Orthodontic appliances were fixed to mesially guide the maxillary first molars. RESULTS: The rats' teeth were mesially moved in the area filled with bioglass. There were no significant differences between two sides in movement distance of the first molars and in thickness of periodontal tissues with paired t-test (P > 0.05). CONCLUSIONS: The rat's tooth can be mesially moved in the area filled with bioglass.
Subject(s)
Alveolar Process/surgery , Biocompatible Materials , Glass , Tooth Movement Techniques , Alveolar Process/injuries , Animals , Female , Molar/physiology , Periodontal Ligament/physiology , Periodontal Prosthesis , Rats , Rats, WistarABSTRACT
PURPOSE: To investigate the discrepancy between ICP and MCP caused by orthodontic treatment. to evaluate the treatment effect of the malocclusion with later orthodontic treatment. METHODS: Nineteen cases were selected and treated with preadjusted appliance and combination headgear appliance.Pre- and post- treatment celphalometric radiographs were analyzed. RESULTS: Discrepancy between ICP and MCP may be resulted from improper design and operation of orthodontists and poor cooperation of patients; By preadjusted appliance and combination headgear appliance,upper dental arch was moved distally; Molar relationship was changed into Class I by bodily movement; A harmonization between ICP and MCP was rehabilitated. CONCLUSIONS: The discrepancy between ICP and MCP should be minded; Preadjusted appliance and combination headgear appliance were effective in the correction of the discrepancy between ICP and MCP.
