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| Comparative evaluation of miniscrew and orthognathic surgery in treatment of skeletal open bite in adults |
| ZHAO Hong1,BU Yaping1,MA Yan1,ZHENG Chunxiu1,GU Xiaoming1,WANG Xiaokun2 |
| 1. Stomatology Department，General Hospital of Chinese People’s Armed Police Forces, Beijing 100039, China; 2. Jingxi Hospital of Beijing Military Region, Beijing 100041, China |
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Abstract Objective To compare the treatment results in patients with skeletal open bite treated with molar intrusion by using miniscrew anchorage and orthognathic surgery. Methods Twenty-five patients with skeletal open bite were treated either by miniscrew anchorage (n=14) or LeFortⅠosteotomy combined with sagittal split ramus osteotomy(SSRO) (n=11). Self -drilling miniscrew implants were inserted into the buccal alveolar bone between maxillary molars and mandibular molars. Palatal and lingual arches were used respectively. 150 g force each side was added to miniscrew to intrude posterior teeth. Pretreatment and posttreatment lateral cephalograms were measured and compared. Results Skeletal open bite malocclusion in 25 patients were corrected effectively. There was no significant difference between miniscrew anchorage and orthognathic surgery, with increased overbites of 6.6mm and 7.2 mm, respectively. Miniscrew was more effective than orthognathic surgery in intruding posterior teeth. U6-PP (1.8 mm，0.2 mm，P<0.01) and L6-MP (1.2 mm，0.3 mm，P<0.05) were intruded significantly. Orthognathic surgery was more effective than miniscrew anchorage in reducing vertical dimension. The MP/SN(6.3°，3.3°，P<0.01)，N-Me (3.8 mm，1.8 mm，P<0.05), ANS-Me (3.9 mm，1.6 mm，P<0.05) and Gn-TH (2.8 mm，0.9 mm，P<0.05) were decreased significantly. Conclusion Self-drilling minisrcew implant can be used as an efficient method to control vertical anchorage and correct skeletal open bite malocclusion effectively through absolute intrusion of posterior dental alveoli.
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Received: 13 August 2012
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2012, Vol. 23 
