van Gastel Jan, Quirynen Marc, Teughels Wim, Coucke Wim, Carels Carine
Department of Orthodontics, Catholic University Leuven, Leuven, Belgium.
J Clin Periodontol. 2007 May;34(5):423-31. doi: 10.1111/j.1600-051X.2007.01070.x.
To compare undisturbed plaque formation on teeth bonded with different types of orthodontic brackets with non-bonded control teeth, via a de novo plaque growth experiment over a 7-day period.
A randomized controlled trial with split-mouth design was set up enroling 16 dental students. Within each subject sites with Speed(S) and GAC(G), brackets and control sites were followed. Clinical periodontal parameters were recorded at baseline, on days 3 and 7. Microbiological samples were taken from the brackets and the teeth on days 3 and 7.
Both anaerobe and aerobe colony-forming units (CFU) were significantly higher in S-sites than in G-sites (p=0.0002, p=0.02). The shift from aerobic to anaerobic species was observed earlier in S-sites than in G-sites. The aerobe/anaerobe CFU ratio was significantly lower in S-sites than in G-sites (p=0.01). On day 3, the crevicular fluid flow was significantly higher in S-sites than in control sites (p=0.01). On day 7, S-sites and G-sites showed a significantly higher crevicular flow than control sites (both p<0.0001). More hypertrophy was seen in S- than in G- and control sites (p=0.05). No significant differences for bleeding on probing were observed.
Bracket design can have a significant impact on bacterial load and on periodontal parameters.
通过为期7天的新生菌斑生长实验，比较用不同类型正畸托槽粘结的牙齿与未粘结的对照牙齿上未受干扰的菌斑形成情况。
采用随机对照裂口设计试验，招募了16名牙科学生。在每个受试者中，对使用Speed（S）和GAC（G）托槽的部位以及对照部位进行跟踪。在基线、第3天和第7天记录临床牙周参数。在第3天和第7天从托槽和牙齿采集微生物样本。
S部位的厌氧菌和好氧菌菌落形成单位（CFU）均显著高于G部位（p = 0.0002，p = 0.02）。S部位比G部位更早观察到从需氧菌到厌氧菌的转变。S部位的需氧菌/厌氧菌CFU比值显著低于G部位（p = 0.01）。在第3天，S部位的龈沟液流量显著高于对照部位（p = 0.01）。在第7天，S部位和G部位的龈沟液流量均显著高于对照部位（p均<0.0001）。S部位比G部位和对照部位出现更多的组织增生（p = 0.05）。探诊出血未观察到显著差异。
托槽设计可对细菌载量和牙周参数产生显著影响。
