Extraction treatment of a class II division 2 malocclusion with mandibular posterior discrepancy and changes in stomatognathic function.
Extraction treatment of a class II division 2 malocclusion with mandibular posterior discrepancy and changes in stomatognathic function.
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伴有下颌后牙差异和口颌功能改变的 II 类 2 错牙合畸形的拔牙治疗。
DOI：
10.2319/031414-194.1
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发表时间：
2015
期刊：
影响因子：
--
通讯作者：
S. Miyawaki
中科院分区：
文献类型：
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作者：
K. Nagayama;H. Tomonari;F. Kitashima;S. Miyawaki
本病例报告描述了一个成功的拔牙治疗II类2分类错牙合与下颌后差异和先天性缺失上颌侧切牙的左侧。下颌牙弓后间隙小，下颌第二磨牙阻生，远中倾斜。通过拔除右侧上颌侧切牙和两侧下颌第二前磨牙来解决上下颌牙弓的差异。下颌第一磨牙的近中移动适当地发生，第二磨牙移动到直立位置。在上颌牙列中使用唇挡配合预调方丝弓矫治器，以加强磨牙支抗和后倾切牙的唇向移动。尽管进行了拔牙治疗，但由于下颌牙列中的唇挡和实用弓，深咬可以得到矫正而不会加重。因此，安氏I类磨牙的关系和一个理想的覆。治疗后，咬合接触面积和最大紧咬时咀嚼肌活动增加。咀嚼时最大闭合速度和最大张口度增大，咀嚼方式由切碎型向磨碎型转变。本病例之研究结果显示，深咬合的矫正可能对改善口颌功能有效。
This case report describes the successful extraction treatment of a Class II division 2 malocclusion with mandibular posterior discrepancy and a congenitally missing maxillary lateral incisor on the left side. The posterior space in the mandibular arch was small, and the mandibular second molars were impacted, with distal tipping. The discrepancies in the maxillary and mandibular arches were resolved by extraction of the maxillary lateral incisor on the right side and the mandibular second premolars on both sides. The mesial movement of the mandibular first molars occurred appropriately, with the second molars moving into an upright position. A lip bumper was used with a preadjusted edgewise appliance in the maxillary dentition to reinforce molar anchorage and labial movement of the retroclined incisors. Despite the extraction treatment, a deep bite could be corrected without aggravation as a result of the lip bumper and utility arch in the mandibular dentition. Thus, an Angle Class I molar relationship and an ideal overbite were achieved. The occlusal contact area and masticatory muscle activities during maximum clenching increased after treatment. The maximum closing velocity and the maximum gape during chewing increased, and the chewing pattern changed from the chopping to grinding type. The findings in the present case suggest that the correction of a deep bite might be effective for improving stomatognathic function.