To evaluate the maxillary dentition effects of the extrusion arch for anterior open bite (AOB) correction in mixed dentition patients. Fourteen subjects with an initial mean age of 9.17 ± 1.03 years presenting with dentoalveolar AOB (mean − 1.28 ± 1.46 mm) and normal facial pattern (FMA = 25.76°) were treated with an extrusion arch. The mean treatment period was 7.79 ± 2.58 months. Lateral cephalograms and dental models were taken before (T0) and after the correction of AOB (T1). Data were analyzed using paired t test to evaluate differences between T0 and T1. For all tests, a significance level of P < .05 was used. All patients achieved positive overbite at T1, with a mean increase of 3.07 mm. The maxillary incisors extruded 1.94 mm. Retroclination of the maxillary incisors (− 6.15°) and an increase in the interincisal angle (5.57°) were observed. There was a significant decrease in the distance between the incisal edge of the maxillary incisors and the molars (− 2.21 mm). There was significant mesial tipping of the maxillary molar (− 11.49°). Significant reductions of overjet (− 1.65 mm), arch perimeter (− 3.02 mm), and arch length (− 2.23 mm) were noted. The transverse maxillary intermolar distance did not change significantly. The use of a maxillary extrusion arch was effective in the treatment of AOB. Overbite increased due to incisor extrusion, as well as retroinclination and overjet reduction. However, side effects, such as mesial molar tipping and decreases in arch perimeter and length might occur.

中文翻译：

---

挤压弓在前路开放性咬合治疗中作用的前瞻性临床试验

为了评估混合牙列患者的前牙开口张开矫正术（AOB）矫治时，使用挤压牙弓的上颌牙列效应。用挤压牙弓治疗了十四名初始平均年龄为9.17±1.03岁且患有牙槽泡AOB（平均-1.28±1.46 mm）和正常面部表情（FMA = 25.76°）的受试者。平均治疗时间为7.79±2.58个月。在AOB校正之前（T0）和校正后（T1）拍摄侧位脑波图和牙科模型。使用配对t检验分析数据，以评估T0和T1之间的差异。对于所有测试，均使用P <.05的显着性水平。所有患者在T1时都获得了积极的咬合，平均增加了3.07 mm。上颌切牙伸出1.94毫米。上牙切牙后倾（-6.15°）和切齿间夹角增加（5。观察到57°）。上颌切牙的切缘与磨牙之间的距离（-2.21 mm）明显减少。上颌磨牙明显偏向内侧（-11.49°）。注意到显着减少了过喷射（-1.65毫米），弓长（-3.02毫米）和弓长（-2.23毫米）。上颌横磨牙间距离无明显变化。使用上颌挤压牙弓可有效治疗AOB。由于门牙挤压，后倾和过喷射减少，咬合增加。但是，可能会发生副作用，例如中臼齿倾侧以及牙弓周长和长度的减小。上颌磨牙明显偏向内侧（-11.49°）。注意到显着减少了过喷射（-1.65毫米），弓长（-3.02毫米）和弓长（-2.23毫米）。上颌横磨牙间距离无明显变化。使用上颌挤压牙弓可有效治疗AOB。由于门牙挤压，后倾和过喷射减少，咬合增加。但是，可能会发生副作用，例如中臼齿倾侧以及牙弓周长和长度的减小。上颌磨牙明显偏向内侧（-11.49°）。注意到显着减少了过喷射（-1.65毫米），弓长（-3.02毫米）和弓长（-2.23毫米）。上颌横磨牙间距离无明显变化。使用上颌挤压牙弓可有效治疗AOB。由于门牙挤压，后倾和过喷射减少，咬合增加。但是，可能会发生副作用，例如中臼齿倾侧以及牙弓周长和长度的减小。由于门牙挤压，后倾和过喷射减少，咬合增加。但是，可能会发生副作用，例如中臼齿倾侧以及牙弓周长和长度的减小。由于门牙挤压，后倾和过喷射减少，咬合增加。但是，可能会发生副作用，例如中臼齿倾侧以及牙弓周长和长度的减小。