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Forces produced by different nonconventional bracket or ligature systems during alignment of apically displaced teeth

linhongcrystal 添加于 2010-5-4 22:11 | 755 次阅读 | 0 个评论

作者
Baccetti T, Franchi L, Camporesi M, Defraia E, Barbato E
摘要
OBJECTIVE: To analyze the forces released by four types of passive stainless steel self-ligating brackets (SLBs), and by two nonconventional elastomeric ligature-bracket systems when compared with conventional elastomeric ligatures on conventional stainless steel brackets during the alignment of apically displaced teeth at the maxillary arch. MATERIALS AND METHODS: An experimental model consisting of five brackets was used to assess the forces released by the seven different ligature-bracket systems with 0.012'' or 0.014'' superelastic nickel titanium wire in the presence of different amounts of apical displacement of the canine (ranging from 1.5 mm to 6 mm). Comparisons between the different types of bracket/wire/ ligature systems were carried out by means of ANOVA on ranks with Dunnett's post hoc test (P < .05). RESULTS: When correction of a misalignment greater than 3 mm is attempted, a noticeable amount of force for alignment is generated by passive SLBs and nonconventional elastomeric ligature-bracket systems, and a null amount of force is released in the presence of conventional elastomeric ligatures on conventional brackets. CONCLUSIONS: When minimal apical displacement is needed (1.5 mm), the differences in performance between low-friction and conventional systems are minimal. These differences become significant when correction of a misalignment of greater than 3.0 mm is attempted.
详细资料
- 文献种类:期刊
- 期刊名称: The Angle Orthodontist
- 期刊缩写: Angle Orthod
- 期卷页: 2009年第79卷第3期 533-539页
- 地址: Department of Orthodontics, University of Florence, Florence, Italy
- ISBN: 0003-3219
- 备注:PMID:19413392
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