Twetman S, McWilliam J S, Hallgren A, Oliveby A
Department of Pedodontics, School of Dentistry, Karolinska Institute, Huddinge Sweden.
Swed Dent J. 1997;21(5):169-75.
The cariostatic effect of a fluoride releasing bonding agent was investigated and compared with a conventional composite based material in connection with bonding of orthodontic brackets in 22 homologous pairs of premolars. All subjects had malocclusions requiring orthodontic treatment with fixed appliances and extraction of at least two premolars. 6-13 weeks prior to extraction, orthodontic brackets were bonded to the labial surfaces of the extraction teeth with either a glass ionomer cement or a bis-GMA resin. Initially, the children were instructed in tooth brushing and the regular use of fluoride. After extraction, the bonded teeth were stained and evaluated in a stereo-microscope regarding the incidence and extension of initial enamel demineralisation. The zone of intact enamel adjacent to the bracket base and bonding material was measured in a stereo-microscope at four predetermined locations with the aid of an electronic ruler and scored according to four categories. The incidence of enamel demineralisation adjacent to glass ionomer bonded and composite bonded brackets was 68% and 77% respectively. In 12 pairs of premolars however, the demineralisation appeared to a lesser extent on the enamel around the brackets was generally wider when glass ionomer cement was used compared to the composite resin. These differences were statistically significant (p < 0.05) mesially and distally, but non-significant cervically and incisally. The results indicate that bonding with glass ionomer cement may have a local cariostatic effect in children requiring fixed orthodontic appliances.
研究了一种释氟粘结剂的防龋效果，并将其与传统复合材料在22对同源前磨牙正畸托槽粘结方面进行了比较。所有受试者均有牙列不齐，需要使用固定矫治器进行正畸治疗，并至少拔除两颗前磨牙。在拔牙前6 - 13周，用玻璃离子水门汀或双酚A - 甲基丙烯酸缩水甘油酯（bis - GMA）树脂将正畸托槽粘结到拔牙牙的唇面。最初，指导孩子们刷牙并定期使用氟化物。拔牙后，对粘结的牙齿进行染色，并在立体显微镜下评估初始釉质脱矿的发生率和范围。在立体显微镜下，借助电子尺在四个预定位置测量托槽基部和粘结材料相邻的完整釉质区域，并根据四类进行评分。与玻璃离子粘结托槽和复合树脂粘结托槽相邻的釉质脱矿发生率分别为68%和77%。然而，在12对前磨牙中，与复合树脂相比，使用玻璃离子水门汀时，托槽周围釉质上的脱矿程度似乎较小，但脱矿范围通常更宽。这些差异在近中面和远中面具有统计学意义（p < 0.05），但在颈部和切缘无统计学意义。结果表明，对于需要固定正畸矫治器的儿童，用玻璃离子水门汀粘结可能具有局部防龋作用。
