Erickson Robert L, Barkmeier Wayne W
Department of General Dentistry, Creighton University School of Dentistry, Omaha, NE, USA.
Eur J Oral Sci. 2017 Feb;125(1):88-92. doi: 10.1111/eos.12325. Epub 2017 Jan 9.
The purpose of this study was to examine the effect of mold diameter on depth of cure of a resin-based composite material for varying amounts of irradiation. A resin-based composite was light-cured for 10-80 s in stainless-steel molds of either 6 mm or 4 mm in diameter and then dark-stored for 24 h. Specimens were then scraped back and the length of the cured specimens was measured to provide depth of cure (D ). Radiant exposure to each of the mold diameters was determined by measuring the power. The D values using the 4-mm molds were lower than those of the 6-mm molds. The average difference between the two groups for each irradiation time was 0.45 ± 0.02 mm. A fixed depth of cure required about 39% more irradiation time for the 4-mm mold than for the 6-mm mold but 75% more radiant exposure. The difference in cure depth for a fixed radiant exposure was 0.79 mm. A better comparison of depth of cure is obtained by using identical radiant exposures for different mold diameters. It is believed that greater loss of light by absorption at the stainless-steel cylinder walls for the 4-mm-diameter cylinders accounts for the lower depth of cure when compared with the 6-mm molds.
本研究的目的是考察模具直径对不同辐照量下树脂基复合材料固化深度的影响。将树脂基复合材料在直径为6 mm或4 mm的不锈钢模具中光固化10 - 80秒，然后避光储存24小时。接着刮去试样，测量固化试样的长度以获得固化深度（D）。通过测量功率来确定每种模具直径的辐射暴露量。使用4 mm模具的D值低于6 mm模具的D值。每组在各辐照时间下的平均差异为0.45±0.02 mm。对于固定的固化深度，4 mm模具所需的辐照时间比6 mm模具多约39%，但辐射暴露量多75%。在固定辐射暴露量下，固化深度的差异为0.79 mm。通过对不同模具直径使用相同的辐射暴露量，可以更好地比较固化深度。据信，与6 mm模具相比，直径4 mm的圆柱体在不锈钢筒壁处因吸收导致的光损失更大，这是固化深度较低的原因。
