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首页> 外文期刊>ASDC journal of dentistry for children >Adequacy of mandibular premolar position despite early loss of its deciduous molar.
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Adequacy of mandibular premolar position despite early loss of its deciduous molar.

机译：下颌前磨牙位置的适当性，尽管其乳牙磨牙的早期缺失。

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摘要

The mandibular second premolar (MnP2) tooth is one of the most commonly impacted teeth. Early loss of its deciduous predecessor has long been suggested to be a factor in the etiology of the MnP2 impaction. In this study, panoramic roentgenograms were used to measure the angular position of the unerupted MnP2 in 85 children. The study was carried out to test whether early loss of the lower second primary molar (dM2) correlates with MnP2 malpositions that are measurably greater than those from a control sample. The results show a small and statistically insignificant difference between the mean angles in cases with (79.6 degrees) and without (83.2 degrees) dM2. To eliminate individual factors, e.g., genetics, 2 sides of the same patient, with and without dM2, were compared. The group with the missing dM2 on one side showed higher angle differences, compared with the control group. However, the differences were still small (approximately 4 degrees) and statistically insignificant. Our findings do not showa significant influence of early loss of dM2 on the inclination of the unerupted MnP2, suggesting that environmental factors may be of less significance, compared with genetic ones.
机译：下颌第二前磨牙（MnP2）牙齿是最常见的牙齿之一。长期以来，人们早就认为其落叶前体的早期缺失是MnP2感染病因的一个因素。在这项研究中，全景X线照片被用于测量85名儿童中未断裂的MnP2的角位置。进行该研究以测试较低的第二初级磨牙（dM2）的早期丢失是否与MnP2位置异常有关，该位置明显大于对照样品。结果显示，在有（79.6度）dM2和没有（83.2度）dM2的情况下，平均角度之间的差异很小，但在统计学上无统计学意义。为了消除个体因素，例如遗传因素，比较了同一名患者有dM2和没有dM2的两个方面。与对照组相比，一侧缺少dM2的组显示出更大的角度差。但是，差异仍然很小（大约4度）并且在统计上不显着。我们的发现并未显示dM2的早期丢失对未氧化的MnP2的倾角有显着影响，这表明与遗传因素相比，环境因素的重要性可能较低。

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