Department of Orthodontics, Faculty of Dentistry, Ataturk University, Erzurum, Turkey.
Med Oral Patol Oral Cir Bucal. 2010 Sep 1;15(5):e797-801. doi: 10.4317/medoral.15.e797.
The objectives of this study were to investigate the prevalence and characteristics of tooth agenesis and the associated skeletal morphology and arch widths in a group of Turkish patients seeking orthodontic treatment.
We designed a retrospective study composed of pre- and post-treatment panoramic radiographs and lateral cephalometric films of 3,341 patients (2,040 females and 1,301 males). Tooth agenesis was evaluated for hypodontia and oligodontia -excluding the third molars- from the orthopantomograms. The significance test for the differences in the skeletal morphology between hypodontia and non-hypodontia patients was performed using the Pearson chi-square and Student t-test.
The prevalence of tooth agenesis was 4.6 percent for the Turkish orthodontic patient population. Tooth agenesis was found more frequently in females than in males, although this difference was not statistically significant (p>0.05). The most commonly missing teeth were the maxillary lateral incisors, followed by the mandibular second premolars and mandibular central incisors. Intercanine and intermolar widths in the maxillary and mandibular arches were significantly reduced in the hypodontia group compared with the control group (p<0.01). Tooth agenesis was statistically and significantly less in patients with skeletal Class II (p<0.01). There was no statistically significant difference in hypodontia patients in the vertical relationship of the jaws (p>0.05).
The prevalence of tooth agenesis was found to be 4.6 percent for the Turkish orthodontic patient population (hypodontia 4.3% and oligodontia 0.3%), and was found more frequently in females. Intercanine and intermolar widths were significantly reduced in the hypodontia group for both jaws compared with the control group.
本研究旨在调查一组寻求正畸治疗的土耳其患者中牙齿缺失的发生率和特征，以及相关的骨骼形态和牙弓宽度。
我们设计了一项回顾性研究，纳入了 3341 名患者（2040 名女性和 1301 名男性）的正畸治疗前后全景片和侧位头颅侧位片。从口腔全景片中评估除第三磨牙外的先天性缺牙和少牙。使用 Pearson 卡方检验和学生 t 检验比较先天性缺牙和非先天性缺牙患者的骨骼形态差异。
土耳其正畸患者群体中牙齿缺失的发生率为 4.6%。女性患者中牙齿缺失的发生率高于男性，但差异无统计学意义（p>0.05）。最常见缺失的牙齿是上颌侧切牙，其次是下颌第二前磨牙和下颌中切牙。与对照组相比，上颌和下颌牙弓的尖牙间宽度和磨牙间宽度在先天性缺牙组中显著减小（p<0.01）。骨骼分类为 II 类的患者中牙齿缺失的发生率显著较低（p<0.01）。在颌骨垂直关系方面，先天性缺牙患者之间无统计学差异（p>0.05）。
土耳其正畸患者群体中牙齿缺失的发生率为 4.6%（先天性缺牙 4.3%，少牙 0.3%），女性患者中更为常见。与对照组相比，上颌和下颌牙弓的尖牙间宽度和磨牙间宽度在先天性缺牙组中显著减小。
