Meister Jörg, Kaschuba Natalia, Romer Michael, Bourauel Christoph
Department of Periodontology, Operative and Preventive Dentistry, Bonn University, 53111 Bonn, Germany.
Center of Applied Medical Laser Research and Biomedical Optics (AMLaReBO), Bonn University, 53111 Bonn, Germany.
Materials (Basel). 2023 Jan 31;16(3):1236. doi: 10.3390/ma16031236.
The use of dental ceramics as restorative materials requires corresponding luting materials (cements) that, in turn, influence the visual appearance of the restoration. Due to the high light transmission through the ceramics, the cements can affect the color perception of the dental restoration. This study aims to investigate the optical effects of various cements on the visual appearance of full-ceramic restorations. Three fixing polymer resins (Bifix SE (VOCO GmbH, Cuxhafen, Germany), Breeze (Pentron Clinical, West Collins Orange, CA, USA), and Panavia F. 2.0 (Kuraray, Noritake, Osaka, Japan)), with layer thicknesses of 50, 100, 200, and 250 µm, were applied onto a ceramic base model (0.4 mm thick), and irradiated with laser light of wavelengths 532, 632.8, and 1064 nm. Light intensities and scattering effects of light of various wavelengths were angle-dependent, analyzed using a goniophotometer with perpendicular light incidence on the sample specimen (base model plus luting material). In addition, the transmitted power of the light through the sample specimen was determined as a function of the layer thickness. With increasing layer thickness, power losses of respectively 30% for Bifix SE and Breeze in the visible spectral range were comparable, whereas Panavia F. 2.0 showed a power loss of ca. 44% here. For the near-infrared range, the power losses for all cements were 25%. This could be confirmed by the interpretation of the line widths. Moreover, the line widths for thin cement layer thicknesses (50 and 100 µm) in the visible spectral range displayed only a redistribution of light by scattering, which does not affect color perception at all. In addition, at 200 and 250 µm, absorption occurred which causes a change in color perception. Within the scope of this study, it could be shown that for thin-layer thicknesses of the cement applied here, there is no adverse optical effect on the aesthetic visual appearance of the restoration.
将牙科陶瓷用作修复材料需要相应的粘接材料（粘固剂），而这反过来又会影响修复体的视觉外观。由于光线透过陶瓷的程度很高，粘固剂会影响牙科修复体的颜色感知。本研究旨在调查各种粘固剂对全瓷修复体视觉外观的光学影响。将三种固定聚合物树脂（Bifix SE（德国库克斯港VOCO有限公司）、Breeze（美国加利福尼亚州西柯林斯奥兰治的Pentron Clinical公司）和Panavia F. 2.0（日本大阪的可乐丽诺力泰公司）），层厚分别为50、100、200和250μm，涂覆在一个陶瓷基模（厚0.4mm）上，并用波长为532、632.8和1064nm的激光照射。使用垂直光入射到样品标本（基模加粘接材料）上的测角光度计分析不同波长光的光强度和散射效应，其与角度有关。此外，测定透过样品标本的光的透射功率作为层厚的函数。随着层厚增加，Bifix SE和Breeze在可见光谱范围内的功率损失分别为30%，二者相当，而Panavia F. 2.0在此处的功率损失约为44%。对于近红外范围，所有粘固剂的功率损失均为25%。这可以通过对线宽的解释得到证实。此外，可见光谱范围内薄粘固剂层厚度（50和100μm）的线宽仅显示出光通过散射的重新分布，这根本不会影响颜色感知。此外，在200和250μm时，发生了吸收，这会导致颜色感知发生变化。在本研究范围内，可以表明，此处应用的粘固剂薄层厚度对修复体的美学视觉外观没有不利的光学影响。
