Initial intrusion of the molars in the treatment of anterior open bite malocclusions in growing patients.
Initial intrusion of the molars in the treatment of anterior open bite malocclusions in growing patients.
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DOI：
10.1043/0003-3219(2004)074
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发表时间：
2009-07
期刊：
影响因子：
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通讯作者：
A. Gurton;E. Akin;Ş. Karaçay
中科院分区：
文献类型：
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作者：
A. Gurton;E. Akin;Ş. Karaçay
过度发散型和/或前牙开牙合的治疗是正畸医生面临的常见问题之一。本研究的目的是提出一种新的矫治器（磨牙压入器），并确定其在治疗前牙开的效果。研究组包括14名患者（8名女孩和6名男孩），平均年龄为10岁7个月。所有患者均表现为第二前磨牙间的前牙开牙合畸形。本研究采用磨牙压入前（T1）和压入后（T2）的头颅侧位片。所有患者的根尖X线片、研究模型和标准照片也在磨牙压入前后获得。使用配对样本t检验确定参数之间的差异。使用磨牙侵入器的平均治疗时间为5个月。上颌磨牙和下颌磨牙的平均压入分别为1.86 mm和1.04 mm。上颌中切牙前伸0.54 mm，唇侧倾斜1.46 °，覆牙合增加4.00 mm，下颌平面角平均减小1.57 °，前牙面高度平均减小1.86 mm。下颌骨呈逆时针旋转，颏部向前移动，后/前面高比值增大。在侵入期结束时，患者的前开牙合得到了显著的恢复，简化了进一步的正畸治疗。
The treatment of the hyperdivergent phenotype and/or anterior openbite is one of the common problems facing orthodontists. The purpose of this study is to present a new appliance (Molar Intruder) for molar intrusion and to determine its effects in the treatment of anterior openbite. The study group comprised 14 patients (eight girls and six boys), with a mean age of 10 years and 7 months. All presented anterior open bite malocclusions between the second premolars. The study was carried out on lateral head films taken before (T1) and after (T2) molar intrusion. Periapical radiographs, study models, and standard photographs of all the patients were also obtained before and after molar intrusion. The paired sample t-test was used to determine the differences between the parameters. The average treatment time with the Molar Intruder was five months. The mean intrusion of maxillary and mandibular molars was 1.86 mm and 1.04 mm, respectively. Maxillary incisors extruded 0.54 mm with a labial tipping of 1.46 degrees and overbite increased by 4.00 mm. The mandibular plane angle was decreased by 1.57 degrees, and the anterior face height was decreased by 1.86 mm on average. The mandible showed a counterclockwise rotation, the chin moved forward, and the posterior facial height/anterior facial height ratio was increased. Anterior openbites of the patients were significantly rehabilitated at the end of the intrusion period, simplifying further orthodontic treatment.