Marques Leandro Silva, Ramos-Jorge Maria Leticia, Araujo Mônica Tirre de Souza, Bolognese Ana Maria
University of Vale do Rio Verde, Três Corações, Brazil.
World J Orthod. 2008 Winter;9(4):319-28.
To evaluate the effects of orthodontic treatment among individuals with Class II Division 1 malocclusion and severe overbite.
The sample was made up of 70 patients (35 males and 35 females), with an average age of 11.6 years in pretreatment and 14.9 years in posttreatment. One hundred forty lateral cephalograms were obtained and traced by a single investigator. All individuals were treated with the edgewise technique associated with the Kloehn cervical extraoral headgear during the growth spurt, and simultaneously presented ANB > or = 5 degrees and overbite > or = 4 mm. Statistical analysis involved t tests for both independent and paired samples and the Spearman correlation test.
There were no significant differences between genders regarding the effects of treatment. The cases treated with extraction presented a greater reduction in the SNA angle. On average, all the variables of the study were significantly different when comparing the pretreatment and posttreatment conditions, except for the measurement of the mandibular plane angle (SNGoMe).
Correction of severe overbite occurred in virtue of the intrusion of the maxillary and mandibular incisors associated to a reduction of the maxillary prognathism and differential growth of the mandible, as well as dentoalveolar growth.
评估正畸治疗对安氏II类1分类错牙合及严重深覆牙合患者的疗效。
样本由70例患者组成（35例男性和35例女性），治疗前平均年龄11.6岁，治疗后平均年龄14.9岁。由一名研究人员获取并描绘了140张头颅侧位片。所有个体在生长高峰期采用方丝弓技术联合Kloehn颈带式口外弓进行治疗，同时呈现ANB≥5°和深覆牙合≥4mm。统计分析包括独立样本和配对样本的t检验以及Spearman相关性检验。
治疗效果在性别之间无显著差异。拔牙治疗的病例SNA角减小更明显。平均而言，比较治疗前和治疗后的情况时，除下颌平面角（SNGoMe）测量值外，研究的所有变量均有显著差异。
严重深覆牙合的矫治是由于上颌和下颌切牙的压低，同时上颌前突减小、下颌差异生长以及牙槽生长所致。
