Compare The Effect On Orthognathic Surgery Between Maxillary Tooth Extraction And Non-extraction

ObjectiveIn presurgical orthodontics treatment of skeletal class III malocclusion patients treated with bimaxillary orthognathic surgery, maxillary premolar extraction is preformed sometimes. The objective of the present article was to compare the postsurgery facial profile and occlusion between extraction and non-extraction decompensation.MethodsRecords of 36 completed surgical-orthodontic treatment skeletal class III malocclusion patients were obtained from Stomatology Hospital of China Medical University,18 underwent maxillary premolar extraction, the other 18 underwent non-extraction.We analyzed their post-decompensation and postsurgery cephalometric radiographs objectively, and also evaluated their profile scissors-shadows in different groups subjectively. ResultsThe cephalometric index of post-presurgical orthodontics showed that there were significant deviations between the extraction and non-extraction groups including U1-SN, Overjet and Cm-Sn-UL values (P<0.05); During surgery, mandible was averagely retruded 8.66mm in extraction group compared with 6.21mm in non-extraction group; after surgery, the extraction group achieved more normal ANB,U1-SN,U1-NA Length and NA-PA values. Soft-tissue analysis showed nonsignificant deviation. Different people gave different evaluation to these profiles. Professional doctors gave higher evaluation to extraction group, but non-professional people did not think there was significant deviation (P>0.05).ConclusionsMaxillary premolar extraction can make incisor decompensation more complete so that mandible can be retruded to more ideal position and concave face can be successfully corrected; because of soft tissue camouflage, the results of non-extraction can also satisfy non-professional people.