Relationship between malocclusion severity and treatment success rate in Class II nonextraction therapy
Relationship between malocclusion severity and treatment success rate in Class II nonextraction therapy
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DOI：
10.1016/j.ajodo.2008.10.005
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发表时间：
2009-03-01
影响因子：
3
通讯作者：
Pinzan, Arnaldo
中科院分区：
文献类型：
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作者：
Janson, Guilherme;Valarelli, Fabricio Pinelli;Pinzan, Arnaldo
简介：本研究的目的是根据初始严重程度评估II类错（牙合）不拔牙的治疗成功率。方法：将276例安氏Ⅱ类错牙合患者按错牙合严重程度分为2组。第1组包括144例双侧半II类错牙合患者，初始平均年龄为12.27岁。第2组包括132名最初患有双侧完全II类错牙合的患者，初始平均年龄为12.32岁。患者的初始和最终研究模型采用Grainger的治疗优先指数进行评价。卡方检验用于检验两组之间分类变量的差异。关于咬合结果的变量进行了比较与独立的t检验。结果：第1组的最终咬合结果明显优于第2组，治疗时间更短，治疗效率指数更高。结论：基于这些结果，得出结论，当治疗不进行拔牙时，双侧半II类错牙合的治疗成功率高于双侧完全II类错牙合。(Am J Orthod Dentofacial Orthop 2009; 135：274.e1-274.e8）
Introduction: The purpose of this study was to evaluate the treatment success rate of Class II malocclusion without extractions, according to initial severity. Methods: Class II subjects (n = 276) were divided into 2 groups according to the severity of the malocclusion. Group 1 comprised 144 patients with bilateral half Class II malocclusion at the initial mean age of 12.27 years. Group 2 comprised 132 patients who initially had bilateral complete Class II malocclusion at the initial mean age of 12.32 years. The patients' initial and final study models were evaluated with Grainger's treatment priority index. Chi-square tests were used to test for differences between the 2 groups for categorical variables. Variables regarding occlusal results were compared with independent t tests. Results: Group 1 had a significantly better final occlusal result, a shorter treatment time, and a higher treatment efficiency index. Conclusions: Based on these results, it was concluded that bilateral half Class II malocclusion has a better treatment success rate than bilateral complete Class II malocclusion when treatment is conducted without extractions. (Am J Orthod Dentofacial Orthop 2009; 135: 274.e1-274.e8)