Von Beetzen M, Li J, Nicander I, Sundström F
Karolinska Institutet, School of Dentistry, Huddinge, Sweden.
Oper Dent. 1993 May-Jun;18(3):103-9.
A new technique for curing class 2 composite fillings was investigated with respect to microhardness and porosity in the cervical part of the restorations. The technique is based on a plastic transparent cone that is attached to the curing wand. Before polymerizing the cervical portion, the cone is pressed down into the material in the direction of the floor of the approximal box. When the light is activated, it concentrates in the tip of the cone, from where it is distributed into the composite material. In order to compare this technique with conventional curing, standardized class 2 cavity preparations were made in brass blocks. Four different composite materials were used for 20 restorations each: Heliomolar, Herculite XR, Occlusin, and P-50. Ten restorations of each material were cured using the conventional technique (in two portions), and in the remaining 10 restorations the cervical portion was cured with the transparent cone. The irradiation time was 60 seconds in all instances. The Vickers hardness of the cervical approximal surfaces was measured after one and 24 hours. The surfaces were photographed in a stereomicroscope, and the numbers of porosities were counted on black-and-white prints.(ABSTRACT TRUNCATED AT 250 WORDS)
针对二类复合树脂充填修复体颈部的显微硬度和孔隙率，研究了一种新的固化技术。该技术基于一个附着在固化棒上的塑料透明圆锥体。在聚合颈部部分之前，将圆锥体沿邻面盒底部方向压入材料中。当灯光激活时，光线集中在圆锥体尖端，然后从那里分布到复合材料中。为了将该技术与传统固化方法进行比较，在黄铜块上制作了标准化的二类洞形。使用四种不同的复合材料，每种材料制作20个修复体：Heliomolar、Herculite XR、Occlusin和P - 50。每种材料的10个修复体采用传统技术（分两部分）固化，其余10个修复体的颈部部分用透明圆锥体固化。所有情况下照射时间均为60秒。在1小时和24小时后测量颈部邻面的维氏硬度。在立体显微镜下对表面进行拍照，并在黑白照片上统计孔隙数量。（摘要截断于250字）
