Department of Orthodontics, School of Dentistry, University of Geneva, Geneva, Switzerland.
Am J Orthod Dentofacial Orthop. 2011 Apr;139(4 Suppl):S129-32. doi: 10.1016/j.ajodo.2010.05.017.
Our aim was to investigate 8 years of vertical changes of the gingival margin and tooth displacement of maxillary molars and incisors in adolescents and adults.
Twenty-five adolescents and 10 adults were included in this study, with dental casts taken 2 and 10 years after orthodontic treatment. The gingival contour of the teeth was traced digitally using calibrated photographs of the 2 dental casts, and gingival changes were measured on crown superimposition. Eruption of the central incisors and first molar were measured on dental casts after scanning and superimposition on the palatal vault.
Adults and adolescents presented a mean molar eruption of 0.27 and 0.34 mm and a mean incisor eruption of 0.39 and 0.73 mm, respectively. Adults and adolescents presented a mean molar gingival displacement of respectively 0.34 and 0.77 mm, and the adolescents a mean incisor gingival displacement of 0.44 mm. Correlation between secondary tooth eruption and gingival displacement was obtained only for the incisors in the adolescent group.
Adolescents and adults presented apical displacement of the gingival contour of the maxillary first molars, as was the case for maxillary incisors in adolescents. Secondary eruption of maxillary first molars and central incisors continues in adolescents and adults.
我们旨在研究青少年和成年人上颌磨牙和切牙牙龈边缘和牙齿位置 8 年的垂直变化。
本研究纳入了 25 名青少年和 10 名成年人，在正畸治疗后 2 年和 10 年分别取牙模。使用校准后的牙模照片对牙齿的牙龈轮廓进行数字化追踪，并在牙冠叠加上测量牙龈变化。在扫描和对上颌穹顶进行叠加后，在牙模上测量中切牙和第一磨牙的萌出。
成年人和青少年的磨牙平均萌出量分别为 0.27 和 0.34mm，切牙平均萌出量分别为 0.39 和 0.73mm。成年人和青少年的磨牙牙龈平均移位量分别为 0.34 和 0.77mm，青少年的切牙牙龈平均移位量为 0.44mm。仅在青少年组中，获得了第二磨牙萌出和牙龈移位之间的相关性。
青少年和成年人上颌第一磨牙的牙龈轮廓呈根尖向移位，青少年的上颌切牙也是如此。上颌第一磨牙和中切牙的二次萌出在青少年和成年人中仍在继续。
