Pascotto Renata Corrêa, Navarro Maria Fidela de Lima, Capelozza Filho Leopoldino, Cury Jaime Aparecido
Department of Dentistry, State University of Maringá, PR, Brazil.
Am J Orthod Dentofacial Orthop. 2004 Jan;125(1):36-41. doi: 10.1016/s0889-5406(03)00571-7.
Because the risk of dental caries increases with the use of orthodontic appliances and its control cannot depend only on the patient's self-care, this study evaluated the effect of a glass ionomer cement on reducing enamel demineralization around orthodontic brackets. Fourteen orthodontic patients were randomly divided into 2 groups of 7; they received 23 brackets fitted to their premolars, bonded with either Concise (3M Dental Products, St Paul, Minn), a composite resin (control group), or Fuji Ortho LC (GC America, Chicago, Ill), a resin-modified glass ionomer cement (experimental group). The volunteers lived in a city that has fluoridated water, but they did not use fluoridated dentifrices during the study. After 30 days, the teeth were extracted and longitudinally sectioned; in the enamel around the brackets, demineralization was assessed by cross-sectional microhardness. The determinations were made at the bracket edge cementing limits, and at occlusal and cervical points 100 and 200 microm away from them. In all of these positions, indentations were made at depths from 10 to 90 microm from enamel surface. Analysis of variance showed statistically significant effects for position, material, depth, and their interactions (P<.05). The Tukey test showed that the glass ionomer cement was statistically more efficient than the control, reducing enamel demineralization in all analyses (P<.05). The use of glass ionomer cement for bonding can be encouraged because it decreases the development of caries around orthodontic brackets.
由于使用正畸矫治器会增加患龋齿的风险，且其控制不能仅依赖于患者的自我护理，本研究评估了玻璃离子水门汀对减少正畸托槽周围牙釉质脱矿的效果。14名正畸患者被随机分为两组，每组7人；他们的前磨牙上安装了23个托槽，分别用复合树脂Concise（3M牙科产品公司，明尼苏达州圣保罗）粘结（对照组），或用树脂改性玻璃离子水门汀Fuji Ortho LC（GC美国公司，伊利诺伊州芝加哥）粘结（实验组）。志愿者生活在一个有含氟水的城市，但在研究期间他们没有使用含氟牙膏。30天后，拔除牙齿并纵向切片；在托槽周围的牙釉质中，通过横断面显微硬度评估脱矿情况。测定在托槽边缘粘结界限处以及距其100和200微米的咬合点和颈缘点进行。在所有这些位置，从牙釉质表面10至90微米的深度处制作压痕。方差分析显示位置、材料、深度及其相互作用具有统计学显著效应（P<0.05）。Tukey检验表明，在所有分析中，玻璃离子水门汀在统计学上比对照组更有效，可减少牙釉质脱矿（P<0.05）。可以鼓励使用玻璃离子水门汀进行粘结，因为它可减少正畸托槽周围龋齿的发生。
