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Evaluation of skeletal asymmetry in patients with posterior crossbites.

机译：后交叉咬伤患者骨骼不对称的评估。

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摘要

A posterior dental crossbite, in which one or more of the posterior teeth are locked in an abnormal coronal relationship with the opposing teeth of the opposite arch, is a common malocclusion that affects orthodontic patients. Early interceptive treatment is recommended for patients exhibiting a posterior dental crossbite, with a centric relation (CR) and centric occlusion (CO) shift, since it has been suggested that a prolonged mandibular shift resulting from dental interferences may result in an asymmetrical growth of one or both of the jaws. The purpose of this study was to determine if patients with an untreated skeletal and dental posterior crossbite display skeletal asymmetry based upon evaluation of a posteroanterior (PA) radiographic, utilizing constructed reference lines.;Sixty subjects where selected from patient files from the State University of New York at Buffalo orthodontic clinic. Thirty patients, 14 years of age and older, were selected for the crossbite group if there was the presence of a dental crossbite involving at least two posterior teeth as well as the presence of a skeletal posterior crossbite, based upon Ricketts PA cephalometric analysis as a ratio of J-J to Ag-Ag less than 0.75. Using the above criteria, thirty patients, 14 years of age and older were selected for the control group if they had a Class I malocclusion without a dental crossbite and skeletal posterior crossbite, based upon Ricketts PA cephalometric analysis as a ratio of J-J to Ag-Ag greater than 0.75. Evaluation of cranial skeletal asymmetry was made on PA cephalograms utilizing constructed reference lines. The observed differences between the ratio (JR-JL/RAG-LAG) of the control and crossbite groups were statistically significant (F = 113.624, df = 1, 56, p ≤ 0.001). The results for length of Ag along the vertical reference line showed no significant differences (p>0.05) between the right, and the left sides of the females and the males for both the control and the crossbite groups. The results for the asymmetry index indicated no significant differences (p>0.05) between the control and the crossbite groups. The results for surface area of the triangle indicated that no significant differences existed between the right, and the left sides of the females and the males for both the control and the crossbite groups (p>0.05).;The present study is in agreement with those studies that found no link between posterior crossbite malocclusion and asymmetrical growth. Additional studies need to be performed in order to investigate further the true impact that a posterior crossbite has on cranial skeletal structures.
机译：后牙牙合咬合是一种影响正常牙齿矫正的常见错牙合畸形，其中一个或多个后牙与对侧牙弓的对侧牙以一种异常的冠状关系锁定。建议对具有后牙交叉咬合，具有中心关系（CR）和中心闭塞（CO）移位的患者进行早期拦截治疗，因为已经表明，由于牙齿干扰而导致的下颌移位延长可能导致一个人的不对称生长或两个下巴。这项研究的目的是利用建立的参考线，通过评估后前（PA）影像学来确定未经治疗的骨骼和牙齿后交叉咬伤的患者是否表现出骨骼不对称性; 60名受试者选自州立大学的患者档案纽约州布法罗正畸诊所。如果根据Ricketts PA头颅分析法将存在至少两颗后牙的牙齿交叉咬伤以及骨骼后牙交叉咬合存在，则选择30名年龄在14岁及以上的患者作为交叉咬合组。 JJ与Ag-Ag之比小于0.75。根据Ricketts PA头颅分析，以JJ与Ag-的比例为基础，根据上述标准，选择30例年龄在14岁以上的患者，如果他们有I类错牙合而没有牙合咬伤和骨骼后方咬合， Ag大于0.75。使用构造的参考线在PA头颅造影上评估颅骨骨骼的不对称性。对照组和交叉咬伤组的比率（JR-JL / RAG-LAG）之间观察到的差异具有统计学意义（F = 113.624，df = 1、56，p≤0.001）。对照组和交咬组的雌性和雄性右侧和左侧的沿垂直参考线的Ag长度结果均无显着差异（p> 0.05）。不对称指数的结果表明对照组和交叉咬伤组之间无显着差异（p> 0.05）。三角形表面积的结果表明，对照组和交叉咬伤组的雌性和雄性的右侧和左侧之间没有显着差异（p> 0.05）。那些没有发现后交叉咬合错位与不对称生长之间没有联系的研究。为了进一步研究后牙合咬伤对颅骨骨骼结构的真正影响，还需要进行其他研究。

著录项

  • 作者

    Pancko, Nancy Kate.;

  • 作者单位

    State University of New York at Buffalo.;

  • 授予单位 State University of New York at Buffalo.;
  • 学科 Health Sciences Dentistry.
  • 学位 M.S.
  • 年度 2007
  • 页码 77 p.
  • 总页数 77
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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