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Evaluation of the Impaction Pattern of the Third Molar Teeth in an Iranian Population

机译：伊朗人口中第三磨牙的撞击方式评估

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Statement of Problem: Impaction of the third molar teeth is common. Due to the probable complications resulting from tooth impaction and the effects of the impaction pattern on treatment plan, the evaluation of this pattern is important. Purpose: This study aims at evaluation of the impaction pattern of the third molar teeth and its relation with the depth of impaction. Methods and Material: In this descriptive study, panoramic radiographs of 409 patients aged 20-40 years old who referred to Dental Clinic of Guilan University in a two-year period were chosen. The depth of impaction was evaluated according to the relationship between the C ementoenamel Junction (CEJ) of the third molar tooth with the alveolar crest. Winter classification was used for detection of the angulations of the impacted teeth. Pearson Chi square test was applied for data analysis. Results: There were 44.7% males and 55.3% females in this study. Evaluation of the impaction depth showed thatthe most frequent impaction level was level C in the maxilla, and it was level B in the mandible. In the maxilla, 47.5% and in the mandible, 41.2% of the impacted teeth were found in the male patients. The maximum and minimum frequency of different kinds of impaction angulations was vertical (67%) and horizontal (0%) in the maxilla.? In the mandible, it was mesioangular (57.3%), distoangular (1.1%), respectively. In the evaluation of different impaction angulations based on the impaction depth, most of the vertical and mesoangular patterns of the impacted teeth were accompanied with level C and level B, respectively. Conclusion: There was no difference between female and male patients for frequency of the impacted teeth in the maxilla and mandible. Distribution of the angular pattern of impaction was different in the maxilla and mandible. There was no significant difference between the frequency of impaction angulations in different impaction levels. Key words : Radiography, Dental - Tooth, Impacted- Molar, Third.
机译：问题陈述：第三颗磨牙的影响很普遍。由于牙齿撞击可能引起的并发症，以及撞击方式对治疗计划的影响，因此对该方式的评估非常重要。目的：本研究旨在评估第三磨牙的撞击方式及其与撞击深度的关系。方法和材料：在这项描述性研究中，选择了在两年内转诊至桂兰大学牙科诊所的409例20-40岁的患者的全景X线照片。根据第三颗磨牙的C牙釉质结与牙槽c之间的关系评估撞击深度。冬季分类用于检测患牙的角度。皮尔逊卡方检验用于数据分析。结果：本研究中男性占44.7％，女性占55.3％。患肢深度的评估显示，最频繁的患肢水平是上颌骨的C级，下颌骨是B级。在上颌骨中，有47.5％的牙齿和下颌中的41.2％的牙齿是男性患者。在上颌骨中，不同类型的撞击角度的最大和最小频率为垂直（67％）和水平（0％）。在下颌骨中，分别为近中角（57.3％）和远中角（1.1％）。在根据撞击深度评估不同的撞击角度时，受影响牙齿的大多数垂直和中间角度模式分别伴有C级和B级。结论：上颌骨和下颌骨的患牙频率在男女之间没有差异。上颌骨和下颌骨的撞击角模式分布不同。在不同的撞击水平上，撞击角度的频率之间没有显着差异。关键词：放射线照相术，牙齿-牙齿，撞击磨牙，第三。

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