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首页> 外文期刊>ASDC journal of dentistry for children >Descriptive classification of variations in primary mandibular first molars.
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Descriptive classification of variations in primary mandibular first molars.

机译:下颌第一磨牙变化的描述性分类。

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摘要

Variability in tooth morphology can play a significant role in the achievable results of restorative treatment. This study identified the variations of morphology of the primary mandibular first molar (Type I and II coronal outline and Type A-F cusp alignment.) Type I coronal outline was found more frequently (86 percent) than Type II (14 percent). 93 percent of the primary mandibular first molars comprise four cusps, 5 percent comprise five cusps, and 2 percent comprise 3 cusps (F). Among the four-cusp group, 70 percent had an oblique transverse ridge (C), 25 percent had a poorly developed transverse ridge (A). Among the five-cusp-group, 67 percent had a distal cusp (E), and 33 percent had a fifth lingual cusp (D). The most frequent combination of coronal outline and cusp alignment was Type I-C (60 percent), and followed by Type I-B (22 percent), II-C (5 percent), and II-A (4 percent).
机译:牙齿形态的变化可以在修复治疗的可实现结果中发挥重要作用。这项研究确定了下颌第一磨牙的形态变化(I型和II型冠状轮廓和A-F型尖角对齐。)I型冠状轮廓的出现频率更高(86%),比II型(14%)更高。下颌第一磨牙的93%包含四个尖端,5%包含五个尖端,而2%包含三个尖端(F)。在四尖瓣组中,有70%的人有一个倾斜的横向脊(C),有25%的人有一个发育不良的横向脊(A)。在五瓣组中,有67%的患者具有远端尖瓣(E),而33%的患者具有第五舌尖(D)。冠状轮廓和尖瓣对齐最常见的组合是I-C型(60%),其次是I-B型(22%),II-C型(5%)和II-A型(4%)。

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