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首页> 外文期刊>Journal of Dentistry >Evaluation of Histologic Changes of Human Dental Pulp Following Orthodontic Extrusive and Intrusive Forces
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Evaluation of Histologic Changes of Human Dental Pulp Following Orthodontic Extrusive and Intrusive Forces

机译：正畸挤压和侵入力对人牙髓组织学变化的评价

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Statement of Problem: Understanding the effects of orthodontic force on the pulp is of particular interest, especially because altered pulpal respiration rate, secondary dentin formation, internal root resorption, and even pulpal necrosis have all been associated with orthodontic treatment. Purpose: The aim of this study was to evaluate and compare the effects of orthodontic extrusive and intrusive forces on the histologic changes of the human dental pulp after 3 days and 3 weeks. Materials and Method: In this study, 52 sound upper first premolars from 26 patients, scheduled for extraction for orthodontic reasons, were selected. The patients were divided randomly into 2 groups (3 days and 3 weeks). In each group, 10 teeth received orthodontic extrusive forces, 10 teeth underwent intrusive forces and 6 teeth served as controls.? Histologic changes were evaluated and the data were statistically evaluated by nonparametric tests. Results: Vacuolization and disruption of the odontoblastic layer showed statistically significant differences between the control and either of the experimental groups in each test period. Furthermore, fibrous tissue formation in the extrusive group was significantly higher than the control group in the 3-week period. There was no significant difference between 3-day and 3-week intervals in each experimental group, except that fibrosis in the extrusive group was significantly increased after 3 weeks of force application. Comparison between extrusive and intrusive groups revealed no statistical significance in each test period. Conclusion: The results indicate that if orthodontic forces are applied in the optimal range and are not more intense than the physiological limit of tissue tolerance, irreversible injuries to the pulp can be prevented. Key words: Histology, Pulp, Extrusive, Intrusive.
机译：问题陈述：理解正畸力对牙髓的影响特别重要，特别是因为改变的牙髓呼吸速率，继发性牙本质形成，内部牙根吸收甚至牙髓坏死都与正畸治疗有关。目的：本研究的目的是评估和比较3天和3周后正畸挤压力和侵入力对人牙髓组织学变化的影响。材料和方法：在这项研究中，选择了来自26位患者的52个上颌第一前磨牙，这些牙齿计划因正畸原因而拔除。将患者随机分为两组（3天和3周）。在每组中，有10颗牙齿受到正畸挤压力，有10颗牙齿受到了挤压力，而6颗牙齿作为对照组。通过非参数测试评估组织学变化并统计评估数据。结果：在每个测试期间，对照组和任一实验组之间的齿质形成层的真空化和破坏显示出统计学上的显着差异。此外，在3周的时间内，挤压组的纤维组织形成明显高于对照组。每个实验组的3天和3周间隔之间没有显着差异，除了在施加力3周后挤压组的纤维化明显增加。干预组和干预组之间的比较显示在每个测试期间均无统计学意义。结论：结果表明，如果将正畸力施加在最佳范围内并且强度不超过组织耐受性的生理极限，则可以预防牙髓不可逆转的损伤。关键词：组织学，纸浆，挤压性，侵入性。

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