Paschos Ekaterini, Kleinschrodt Thomas, Clementino-Luedemann Tatiana, Huth Karin C, Hickel Reinhard, Kunzelmann Karl-Heinz, Rudzki-Janson Ingrid
Department of Orthodontics, Ludwig-Maximilians University, Munich, Germany.
Am J Orthod Dentofacial Orthop. 2009 May;135(5):603-12. doi: 10.1016/j.ajodo.2007.11.028.
Demineralization around the bracket is an undesired side effect of orthodontic treatment. The aim of this in-vitro study was to evaluate the efficacy of 5 bonding agents to prevent enamel demineralization. Two quantification methods were used.
Eighty-five extracted teeth were randomly allocated to 5 groups: (1) Transbond Plus SEP and Transbond XT (both, 3M Unitek, Seefeld, Germany), (2) 37% phosphoric acid, Pro Seal (Reliance Orthodontic Products, Itasca, Ill) and Transbond XT, (3) Clearfil Protect Bond (Kuraray Medical, Okayama, Japan) and Transbond XT, (4) 37% phosphoric acid and Light Bond (Reliance Orthodontic Products), and (5) Ortho Conditioner and Fuji Ortho LC (both, GC, Tokyo, Japan). In-vitro caries was created by pH cycling for 30 days. After demineralization, the teeth were scanned with a commercial cone-beam microtomographic system. Then the teeth were examined by polarized light microscopy.
The 2 methods of examination showed significant differences among the 5 groups according to lesion depth and mineral loss (P < 0.01). The resin-modified glass ionomer cement (group 5) had the lowest values for lesion depth and mineral loss.
Fuji Ortho LC showed a significantly smaller lesion depth and less mineral loss compared with the other materials. The cone-beam microtomographic system is suitable for evaluation of subsurface lesions and has considerable advantages.
托槽周围的脱矿是正畸治疗中不良的副作用。本体外研究的目的是评估5种粘结剂预防牙釉质脱矿的效果。使用了两种量化方法。
85颗离体牙被随机分为5组：（1）Transbond Plus SEP和Transbond XT（均为3M Unitek公司，德国塞费尔德），（2）37%磷酸、Pro Seal（Reliance Orthodontic Products公司，伊利诺伊州伊塔斯卡）和Transbond XT，（3）Clearfil Protect Bond（可乐丽医疗株式会社，日本冈山）和Transbond XT，（4）37%磷酸和Light Bond（Reliance Orthodontic Products公司），以及（5）Ortho Conditioner和Fuji Ortho LC（均为GC公司，日本东京）。通过pH循环30天来制造体外龋齿。脱矿后，用商用锥形束显微断层扫描系统对牙齿进行扫描。然后通过偏光显微镜检查牙齿。
两种检查方法显示，根据病变深度和矿物质流失情况，5组之间存在显著差异（P < 0.01）。树脂改性玻璃离子水门汀（第5组）的病变深度和矿物质流失值最低。
与其他材料相比，Fuji Ortho LC的病变深度明显更小，矿物质流失更少。锥形束显微断层扫描系统适用于评估牙釉质下病变，具有相当大的优势。
