Erickson Robert L, Barkmeier Wayne W
Department of General Dentistry, Creighton University School of Dentistry, Omaha, NE, USA.
Eur J Oral Sci. 2019 Dec;127(6):556-563. doi: 10.1111/eos.12652. Epub 2019 Sep 25.
The purpose of this study was to compare the depth of cure (DOC) of a resin-based composite (RBC) using the ISO DOC protocol with stainless-steel and molar-tooth molds (4 mm cylindrical cavity). The tooth mold included testing with and without the occlusal surface being covered with black tape around the cavity opening. The RBC was cured with either halogen (HAL) or light-emitting diode (LED) light. The results showed that specimens made in the non-taped tooth mold had DOCs that were significantly greater (28%-35%) than those in the stainless-steel mold. The taped tooth mold also produced significantly greater DOCs, but only by 6%-8%. Knoop hardness (KNH) measurements along the central axis of the RBC specimens showed that depths for 80% of maximum hardness were substantially greater than those determined by the ISO DOC protocol but were limited to the center and quickly dropped below 80% in a lateral direction. The KHN mapping for each of the three molds found that the ISO DOCs could validate a KHN of ≥80% across the RBC to the periphery, only for the non-taped tooth mold. This was due to light incident on the tooth surrounding the RBC being scattered into the RBC.
本研究的目的是使用ISO固化深度（DOC）协议，比较基于树脂的复合材料（RBC）在不锈钢模具和磨牙模具（4毫米圆柱形腔）中的固化深度。牙齿模具包括在腔开口周围覆盖或不覆盖黑色胶带的咬合面测试。RBC用卤素（HAL）或发光二极管（LED）光固化。结果表明，在未贴胶带的牙齿模具中制作的试样的DOC显著大于（28%-35%）不锈钢模具中的试样。贴胶带的牙齿模具也产生了显著更大的DOC，但仅为6%-8%。沿RBC试样中心轴的努氏硬度（KNH）测量表明，最大硬度80%时的深度远大于ISO DOC协议确定的深度，但仅限于中心，并且在横向方向上迅速降至80%以下。对三种模具中的每一种进行的KHN映射发现，只有对于未贴胶带的牙齿模具，ISO DOC才能验证整个RBC到周边的KHN≥80%。这是由于入射到RBC周围牙齿上的光散射到RBC中。
