【摘要】 目的:通过利用颧牙槽嵴区种植钉支抗整体远移上牙列而矫治边缘性Ⅱ类错,探索此类错畸形更简单、有效的矫治方法。方法:选择9例前牙前凸青少年(13～17岁)正畸患者,前牙Ⅰ～Ⅱ度深覆盖,磨牙为尖对尖远中关系,开唇露齿。正畸拔除上颌7或8牙胚,在颧牙槽嵴区植入自攻式微种植钉支抗,采用直丝弓矫治器,整平后直接在0.019×0.025英寸不锈钢方丝上用微种植钉支抗远中移动整个上牙列,并作治疗前、后X线头影测量分析,采用SPSS 17.0软件包中的配对t检验比较治疗前、后上、下唇位置,上、下颌第一磨牙及切牙的移动。结果:治疗后凸面型得到明显改善,唇齿关系更和谐,上颌切牙及磨牙较治疗前向远中移动,牙轴处于正常倾斜范围,面中部未因拔牙而出现饱满度塌陷。前、后牙覆、覆盖正常,后牙、尖牙均为I类关系,平均疗程14个月。结论:种植支抗可以整体远移上牙列,矫治边缘性Ⅱ类错,且疗效更好,疗程更短。更多还原

【Abstract】 PURPOSE: To investigate the effect of distalization of upper dentition using microscrew anchorages placed in inferiozygomatic area to correct borderline Class Ⅱ malocclusion.METHODS: Nine borderline Class Ⅱ cases aged from 13-17 years old,with moderate convex profile were selected.All cases were designed to extract upper second molars or third molar germs to provide space for distalization of upper dentition using microscrew anchorages placed in inferiozygomatic area.Cephalometrics before and after treatment were compared to analyze the movement of upper morlars and incisors,as well as the position change of upper and lower lips.The data were analyzed by paired t test with SPSS17.0 Software package.RESULTS: After an average of 14 months of treatment,all cases got improved profiles with correction of Class Ⅱ dental relationship.The upper molars and incisors were pulled back 3.1 mm and 2.8 mm,respectively.No adverse root resorption or sinus infection caused by the microscrews was observed.CONCLUSIONS: Microscrew anchorages placed in inferiozygomatic area can be used to correct borderline Class II malocclusion by distalization movement of upper dentition with a better profile and no adverse complication.更多还原