Mendoza-García Luz-Victoria, Vaillard-Jiménez Esther, García-Rocha Araceli, Bellot-Arcís Carlos, Paredes-Gallardo Vanessa
Master in Orthodontics. Benemérita Universidad Autónoma de Puebla. Puebla, Puebla México.
Master in Pediatric Dentistry, Professor, Faculty of Dentistry, Benemérita Universidad Autónoma de Puebla, Mexico.
J Clin Exp Dent. 2017 Mar 1;9(3):e333-e337. doi: 10.4317/jced.53434. eCollection 2017 Mar.
Third molars present more problems than other teeth because they are the last teeth to erupt, and so it is important to assess their development when designing an orthodontic treatment plan. The aim of this study was to compare the angulation of the mandibular third molar and retromolar space before and after orthodontic treatment in cases involving first premolar extraction.
76 patients, 59 women (77.63%) and 17 men (22.36%), were recruited from the Orthodontics Clinic at Benemérita Universidad Autónoma de Puebla (Mexico). Panoramic radiographs were analyzed before and after orthodontic treatment that included first premolar extractions, measuring retromolar space (RS) and the angles formed by the intersection of the axes of the third and second molar (α) and the intersection of the axis of the mandibular plane and third molar (β).
The data obtained underwent statistical analysis. The angle α and β showed statistically significant differences on the left side in women. In men, only the right side α angle showed significant differences. Retromolar space increased significantly on both sides for both sexes.
Third molar angulation presents different behaviors between men and women, with greater verticalization in women. Third molar, retromolar space, orthodontics.
第三磨牙比其他牙齿出现的问题更多，因为它们是最后萌出的牙齿，所以在设计正畸治疗方案时评估它们的发育情况很重要。本研究的目的是比较在涉及拔除第一前磨牙的病例中，正畸治疗前后下颌第三磨牙的角度和磨牙后间隙。
从墨西哥普埃布拉自治大学正畸诊所招募了76名患者，其中59名女性（77.63%）和17名男性（22.36%）。对包括拔除第一前磨牙的正畸治疗前后的全景X线片进行分析，测量磨牙后间隙（RS）以及第三磨牙和第二磨牙轴线交点形成的角度（α）和下颌平面与第三磨牙轴线交点形成的角度（β）。
对获得的数据进行统计分析。角度α和β在女性左侧显示出统计学上的显著差异。在男性中，只有右侧的α角显示出显著差异。男女两侧的磨牙后间隙均显著增加。
第三磨牙的角度在男性和女性之间表现出不同的行为，女性的垂直化程度更高。第三磨牙、磨牙后间隙、正畸学。
