下颌骨体支形态对下颌第一恒磨牙出牙影响的研究。

Y. F. Lin
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引用次数: 1

摘要

据报道,下颌第一恒磨牙是第一颗长出的恒牙。然而,根据最近的报道,观察到在下颌中切牙出牙后出现下颌第一恒磨牙的儿童数量有相当大的增加。本研究的目的是探讨下颌第一恒磨牙先于下颌中切牙出牙的受试者(A组)和下颌中切牙先于下颌第一恒磨牙出牙的受试者(B组)在下颌骨包括下颌骨体和支的形态学上是否存在差异。采用45度斜位头颅x线片和牙石膏模型作为材料。通过对数据的统计分析,得出以下结论:1。两组之间的常规角度侧位测量结果无显著差异。2. 两组患者下颌骨长度差异无统计学意义。3.两组在下颌骨体和支上均有显著差异。即与b组相比,A组患儿的下颌第一恒磨牙支更窄,体更长,出牙空间更大。这说明,尽管两组患儿下颌骨的前后尺寸没有显著差异,但以体支比表示的下颌骨内部比例存在显著差异。这可能表明不同比例的下颌骨成分与下颌第一恒磨牙的出牙时间有密切的关系。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Study on morphology of mandibular corpus and ramus influencing the eruption of mandibular first permanent molar.
The mandibular first permanent molar has been reported to be the first permanent tooth to erupt. However, according to the recent reports, a considerable increase in the number of children has been observed with the eruption of the mandibular first permanent molar after the eruption of the mandibular central incisor. The purpose of this study is to investigate whether there is any morphological difference in the mandible including the mandibular corpus and the ramus between the subjects with the mandibular first permanent molar erupting prior to the mandibular central incisor (Group A) and the subjects with the mandibular central incisor erupting prior to the mandibular first permanent molar (Group B). Lateral, posteroanterior, 45-degree oblique cephalometric radiographs and dental plaster models were used as the materials. Based on the data statistically analyzed, the results are summarized as follows: 1. No significant differences were found in the conventional angular lateral cephalometric measurements between the two groups. 2. No significant difference was found in the mandibular length between the two groups. 3. Significant differences were found in the mandibular corpus and the ramus between the two groups. In other words, the children in Group A have a narrower ramus, longer corpus and a larger eruption space for the mandibular first permanent molar than the children in Group B. These results indicate that even though there was no significant difference in the anteroposterior dimension of the mandible between the two groups, the internal proportion of the mandible represented as the ratio between the corpus and ramus was significantly different. This may suggest that the different proportional constituents of the mandible have a close relationship with the eruption timing of the mandibular first permanent molar.
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