Ericson D, Paulsson L, Sowiak H, Dérand T
Department of Cariology, Faculty of Dentistry, University of Lund, Malmö, Sweden.
Scand J Dent Res. 1994 Aug;102(4):244-8. doi: 10.1111/j.1600-0722.1994.tb01188.x.
For investigation of whether the use of a transparent plastic cone (Light-tip) influenced cusp deflection, as compared with a conventional method (control), the following experiments were performed. Mesiodistocclusal (MOD) cavities were prepared in 10 extracted premolars, and stainless steel pins were placed on the cusps. The cavities were bonded with Scotchbond Multipurpose, and the distance between the pins was measured. Control restorations using P-50 were placed in three increments, each increment having been polymerized for 40 s. For placing the test restorations, the Light-tip was fitted to the end of the curing wand and pressed into the resin in the proximal box, and the curing light was turned on. The next increment filled the recess created after the removal of the cone in the resin, and curing was performed with the plastic cone in the occlusal box. The third increment was cured without the cone. Each tooth was used for four restorations. In 16 of 20 cases, a significantly decreased cuspal flexure was found when the cone was used. The flexure decreased 24%, as compared with control.
为了研究与传统方法（对照）相比，使用透明塑料圆锥体（光尖）是否会影响牙尖偏斜，进行了以下实验。在10颗拔除的前磨牙上制备近中邻面洞（MOD洞），并在牙尖上放置不锈钢针。用Scotchbond多功能粘结剂粘结窝洞，并测量针之间的距离。使用P-50进行对照修复，分三层放置，每层聚合40秒。放置测试修复体时，将光尖安装在固化棒末端，压入近中盒内的树脂中，然后打开固化灯。下一层填充去除树脂中的圆锥体后形成的凹槽，并在咬合盒内使用塑料圆锥体进行固化。第三层在没有圆锥体的情况下固化。每颗牙齿用于四次修复。在20个案例中的16个案例中，发现使用圆锥体时牙尖弯曲明显减小。与对照相比，弯曲减小了24%。
