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The materials used in this study comprised the study models of nine patients diagnosed as skeletal Class\u2162malocclusions at Orthodontic Clinic of Niigata University Dental Hospital. In all patients, more than five years passed since sagittal splitting ramus osteotomy had been undergone. We measured irregularity index, intercanine width, intermolar width, arch length, overjet and overbite using each model taken at first visit, finish of active treatment or more than five years after surgery. 1) In the period from first visit to finish of active treatment, crowding was improved. However, more than five years after surgery, irregularity index in the mandible tended to increases significantly. 2) Although overjet and overbite more than five years after surgery were decreasing compared with the period of first visit, there was no significant. 3) Intercaninewidth, intermolar width, and arch length did not show a significant change. In the cases having had large irregularity index at first visit, the change after treatment show a tendency to become large. As previously reported, the change in irregularity index of the maxilla after treatment was less than that of the mandible. It is reported that both overjet and overbite after surgery were maintained by dental compensation corresponding to the postoperative skeletal change. Thus, increase of irregularity index after treatment in the pretreatment study appears to be associated with the postoperative dental compensation.","subitem_description_type":"Abstract"},{"subitem_description":"\u672c\u7814\u7a76\u3067\u306f\u3001\u4e0b\u984e\u679d\u77e2\u72b6\u5206\u5272\u8853\u306b\u3088\u308a\u5916\u79d1\u7684\u77ef\u6b63\u6cbb\u7642\u3092\u884c\u3063\u305f\u9aa8\u683c\u6027\u4e0b\u984e\u524d\u7a81\u75c7\u60a3\u8005\u306b\u304a\u3051\u308b\u4e0a\u4e0b\u6b6f\u5217\u5f13\u306e\u9577\u671f\u7684\u306a\u5909\u5316\u306b\u3064\u3044\u3066\u8abf\u3079\u3001\u691c\u8a0e\u3057\u305f\uff61\u8cc7\u6599\u3068\u3057\u3066\u3001\u672c\u5b66\u9644\u5c5e\u75c5\u9662\u77ef\u6b63\u6b6f\u79d1\u8a3a\u7642\u5ba4\u306b\u304a\u3044\u3066\u9aa8\u683c\u6027\u4e0b\u984e\u524d\u7a81\u75c7\u3068\u8a3a\u65ad\u3055\u308c\u3001\u4e0b\u984e\u679d\u77e2\u72b6\u5206\u5272\u8853\u3092\u65bd\u884c\u3057\u305f\u60a3\u8005\u306e\u3046\u3061\u8853\u5f8c5\u5e74\u4ee5\u4e0a\u7d4c\u904e\u3057\u3001\u8cc7\u6599\u306e\u63c3\u3063\u3066\u3044\u308b9\u75c7\u4f8b\u306e\u60a3\u8005\u306e\u7814\u7a76\u7528\u6a21\u578b\u3092\u7528\u3044\u305f\uff61\u521d\u8a3a\u6642\u3001\u52d5\u7684\u6cbb\u7642\u7d42\u4e86\u6642\u3001\u624b\u8853\u5f8c5\u5e74\u4ee5\u4e0a\u7d4c\u904e\u6642\u306e\u5404\u6642\u671f\u306b\u304a\u3051\u308b\u4e0a\u4e0b\u984e\u6b6f\u5217\u5f13\u306eirregularity 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