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目的:比较摇椅形镍钛圆丝和方丝唇弓矫治安氏Ⅰ类或安氏Ⅱ类错伴深覆患者牙列时,下颌牙在三维方向上的变化,为临床选择不同类型的弓丝提供依据。方法:按标准选择40例病例,依据所使用的镍钛弓丝截面形态、尖牙向后“8”字结扎、唇弓末端回弯等不同,将研究对象分为4组。打开咬合前、后留取患者石膏模型,用激光扫描仪和图像处理软件Imageware扫描处理石膏牙模型,建立数字化研究模型,测量下颌牙的三维变化。应用SPSS12.0软件包对数据进行统计学分析。结果:摇椅形唇弓打开咬合时,会导致牙三维方向上的诸多变化,包括①下颌磨牙区牙弓宽度略增加,尖牙区和第二前磨牙区牙弓宽度变化不明显,牙弓长度有增加趋势。②下切牙龈向压低,唇侧倾斜;使用镍钛方丝及不作末端回弯、“8”字结扎时切牙唇倾较明显。尖牙向远中移动,向后“8”字结扎时移动明显,龈向变化不明显。第二前磨牙向升高;第一磨牙远中颊尖龈向压低,近中颊尖变化不明显,牙有向远中移动的趋势;使用镍钛方丝时,出现颊倾。结论:使用摇椅形唇弓打开咬合时,应用截面形态不同的镍钛圆丝或方丝及弓丝末端是否回弯和尖牙是否向后“8”字结扎,在下颌牙产生的三维变化有一定差异。
OBJECTIVE: To compare the changes of mandibular teeth in three-dimensional directions when rocker chair-shaped NiTi wire and square wire lip bow are used to correct the dentition of Angle Class Ⅰ or Class Ⅱ Malocclusion with deep overburns. Arch wire provides the basis. Methods: Forty cases were selected according to the standard. The subjects were divided into four groups according to the cross-sectional morphology of the nickel-titanium arch wire, the canine posterior “8 ” ligature and the bend of the end of the lip arch. Open the occlusal before and after the patient gypsum model retained, with a laser scanner and image processing software Imageware scan gypsum model, the establishment of digital research model to measure the three-dimensional changes in mandibular teeth. SPSS12.0 software package for statistical analysis of the data. Results: When the rocker-shaped lip was opened and occluded, many changes in the three-dimensional direction of the tooth occurred, including: (1) the arch width of the mandibular molars increased slightly; the arch width of the canines and the second premolar area did not change significantly; There is an increasing trend. Lower incisor gingival depression, labial tilt; use nickel-titanium square wire and not for the end of the bend, “8 ” word ligation incisors lips more obvious. Fangs move farther away, backward “8 ” words ligation movement obvious, gingival feast to change is not obvious. The second premolar increased; the first molar distal cheek tip gingival depression, near the buccal cusps did not change significantly, the teeth have a tendency to move in the far; nickel-titanium square wire, the cheek tilt. Conclusions: When using the rocking chair-shaped lip to open the bite, whether the nickel titanium round wire with different cross-sectional shape or the square wire and the end of the arch wire are bent back and the canine is ligated backwards and the three-dimensional There are some differences in change.