Conry J P, Beyer J P, Pintado M R, Douglas W H
Department of Preventive Science, School of Dentistry, University of Minnesota, Minneapolis 55455.
ASDC J Dent Child. 1992 May-Jun;59(3):177-81.
The amount of extracoronal material placed when a tooth is restored with a preventive resin restoration (PRR) was quantitatively measured together with the projected area of each cavity preparation. Thirty-three patients (mean age 11 yrs, 6 mos) requiring a PRR on a lower first permanent molar were selected. Impressions of the teeth were made with polyvinylsiloxane before and after cavity preparation and then restored with P-50 and Concise sealant. Following occlusal adjustment, a third impression was taken. Replicas were digitized using computer profilometry. Computer images of occlusal surfaces were superimposed using a "goodness of fit" method. The volume of extracoronal material placed on all molar teeth (n = 33) was X = 6.52 +/- 2.9 mm3. The mean depth applied was X = 222.52 +/- 83.09 mu and the mean area of material applied over the entire tooth surface was X = 27.13 +/- 5.72 mm2. The cavity preparations occupied, on average 19.02 percent of the occlusal surface.
在使用预防性树脂修复（PRR）修复牙齿时，所放置的冠外材料量与每个窝洞预备的投影面积一起进行了定量测量。选择了33例（平均年龄11岁6个月）需要对下颌第一恒磨牙进行PRR修复的患者。在窝洞预备前后用聚乙烯基硅氧烷制取牙齿印模，然后用P - 50和Concise封闭剂进行修复。在进行咬合调整后，制取第三次印模。使用计算机轮廓测定法对复制品进行数字化处理。使用“拟合优度”方法叠加咬合面的计算机图像。所有磨牙（n = 33）上放置的冠外材料体积为X = 6.52±2.9 mm³。施加的平均深度为X = 222.52±83.09μm，材料覆盖整个牙齿表面的平均面积为X = 27.13±5.72 mm²。窝洞预备平均占据咬合面的19.02%。
