Department of Orthodontics, School of Dentistry, Federal University of Rio de Janeiro, Rio de Janeiro, Brazil.
Am J Orthod Dentofacial Orthop. 2013 Apr;143(4 Suppl):S72-7. doi: 10.1016/j.ajodo.2012.07.017.
Self-ligating orthodontic brackets rely on clips, rather than ligatures, to hold the archwire in place. It is unknown whether replacing ligatures with clips affects the adherence of Streptococcus mutans. The aim of this research was to evaluate whether self-ligating brackets have an advantage over conventional brackets as determined by the adherence of S mutans.
The sample consisted of 50 esthetic brackets, divided into 3 experimental groups and 2 control groups of 10 brackets each. Two experimental groups were active self-ligating brackets (QuicKlear; Forestadent, Pforzheim, Germany; and In-Ovation C; Dentsply GAC, Bohemia, NY); the other was a passive self-ligating bracket (Damon 3; Ormco, Glendora, Calif). The 2 control groups were conventional brackets (Mystique; Dentsply GAC; and Clarity; 3M Unitek, Monrovia, Calif). The brackets were randomly bonded to the canines, first and second premolars, and first and second molars in the mandibular left hemiarch of 10 male participants. Biofilm was collected from the tooth surfaces before bonding and from the brackets on day 21 and placed in Petri dishes containing Mitis salivarius agar. The brackets were removed on day 28 and examined by using scanning electron microscopy. Statistical analysis, analysis of variance, and the Tukey correction with a P value of 0.05 were used.
The greatest numbers of colonies were found in an active self-ligating bracket group (In-Ovation C), and the fewest colonies were in a conventional bracket group (Clarity). The largest colonies formed on active self-ligating brackets. In the slot, the greatest formation was in a control group (Mystique).
Self-ligating esthetic brackets do not promote greater or lesser S mutans colonization when compared with conventional brackets. Differences were found to be related to the material composition of the bracket.
自锁托槽依靠夹，而不是结扎丝，将弓丝固定到位。目前尚不清楚用夹取代结扎丝是否会影响变异链球菌的黏附。本研究旨在评估自锁托槽是否比传统托槽更具优势，从而确定变异链球菌的黏附情况。
样本由 50 个美学托槽组成，分为 3 个实验组和 2 个对照组，每组 10 个托槽。两个实验组为主动自锁托槽（QuicKlear；Forestadent，普福尔茨海姆，德国；和 In-Ovation C；Dentsply GAC，波希米亚，纽约）；另一个为被动自锁托槽（ Damon 3；Ormco，格伦多拉，加利福尼亚）。两个对照组为传统托槽（Mystique；Dentsply GAC；和 Clarity；3M Unitek，蒙罗维亚，加利福尼亚）。将托槽随机黏结于 10 名男性参与者下颌左侧半弓的尖牙、第一前磨牙、第二前磨牙和第一磨牙。在黏结前和第 21 天从牙面收集生物膜，并将其放入含有唾液链球菌琼脂的培养皿中。第 28 天取下托槽，并用扫描电子显微镜检查。采用方差分析和 Tukey 校正进行统计分析，P 值为 0.05。
在主动自锁托槽组（In-Ovation C）中发现的菌落数量最多，在传统托槽组（Clarity）中发现的菌落数量最少。主动自锁托槽上形成的菌落最大。在托槽槽沟中，对照组（Mystique）的形成量最大。
与传统托槽相比，自锁美学托槽不会促进或减少变异链球菌的定植。差异与托槽的材料组成有关。
