Al Kuwari Huda M, Talakey Arwa A, Al-Sahli Reem M, Albadr Anisa H
Department of Pediatric Dentistry and Orthodontics, College of Dentistry, King Saud University, PO Box 60169, Riyadh 11545, Kingdom of Saudi Arabia.
Saudi Med J. 2013 Jun;34(6):639-43.
To evaluate the influence of orthodontic treatment that involved first premolars extraction on the angulation of the developing mandibular third molars, and whether this will result in an improvement in it's path of eruption during tooth development.
A cross-sectional radiographic study was conducted using 80 panoramic radiographs of 40 orthodontic patients previously treated at the College of Dentistry, King Saud University, Riyadh, Kingdom of Saudi Arabia. The sample consisted of 2 groups, extraction and non-extraction orthodontic therapy group with equal number of patients in each group. The orthodontic treatment of the extraction group involved the extraction of first premolars, whilst non-extraction group had received orthodontic therapy without teeth extraction. The angulation of the right and left third mandibular molars was measured in each patient separately, and the data was analyzed using the non-parametric Mann-Whitney Test.
The present data has shown significant improvement in the third molars angulation in the extraction orthodontic therapy group compared to non-extraction group, Although this finding was significant in both genders, females tend to show better response in the improvement of third molar angulation to extraction therapy than males (p=0.001, p=0.006).
Orthodontic treatment with first premolars extraction has improved the third molars angulation during their course of eruptions and consequently supports the decision of the orthodontic extraction therapy approach in borderline cases.
评估拔除第一前磨牙的正畸治疗对下颌第三磨牙发育角度的影响，以及这是否会在牙齿发育过程中改善其萌出路径。
采用横断面影像学研究，使用沙特阿拉伯利雅得国王沙特大学牙科学院之前治疗的40例正畸患者的80张全景X线片。样本分为两组，拔牙组和非拔牙正畸治疗组，每组患者数量相等。拔牙组的正畸治疗包括拔除第一前磨牙，而非拔牙组接受了不拔牙的正畸治疗。分别测量每位患者左右下颌第三磨牙的角度，并使用非参数曼-惠特尼检验分析数据。
目前的数据显示，与非拔牙组相比，拔牙正畸治疗组的第三磨牙角度有显著改善。尽管这一发现在男女两性中均有显著性，但女性在第三磨牙角度改善方面对拔牙治疗的反应往往比男性更好（p=0.001，p=0.006）。
拔除第一前磨牙的正畸治疗改善了第三磨牙在萌出过程中的角度，因此支持在临界病例中采用正畸拔牙治疗方法的决定。
