Department of Removable Prosthodontics, Faculty of Dental Medicine, Saint-Joseph University, Beirut, Lebanon.
Department of Operative Dentistry, RWTH Aachen University, Aachen, Germany.
Photobiomodul Photomed Laser Surg. 2022 Aug;40(8):573-579. doi: 10.1089/photob.2022.0015. Epub 2022 Aug 2.
This study investigated the effect of dentin surface treatment with the erbium, chromium-doped yttrium, scandium, gallium, and garnet (Er,Cr:YSGG) laser on the bond strength of zirconia to dentin. Although it is well-known that resin cement (RC) provides adequate bond strength of zirconia restorations to the tooth structure, many clinicians were not convinced in bonding reliability to zirconia materials. So, they preferred cementing their crowns with glass-ionomer cement (GIC). Pretreating the dentin surface is recommended to improve the adhesion of crowns cemented with GIC or RC. Recently, the Er,Cr:YSGG laser has been widely used for a cavity preparation, conditioning the tooth structure. However, there is not enough research on the bond strength of zirconia crowns cemented on a Er,Cr:YSGG laser-treated dentin. Forty-eight molars were cut horizontally at the crest of curvature. The flat dentin surface of 24 molars was left untreated, whereas the dentin surface of the other half was treated using an Er,Cr:YSGG laser 2.78 μm (4.5 W, 8.18 J/cm, 90 mJ, 60 μs, 50 Hz, 60% air and 80% water). In addition, 48 plates of zirconia were prepared to be cemented with GIC or RC on the dentin surface. So, the molars were divided into four groups as follows: GIC+untreated dentin; GIC+treated dentin; RC+untreated dentin; and RC+treated dentin. All the specimens were subjected to shear bond strength test. The mode of failure was determined and additional samples were prepared to evaluate the cement-dentin interface using a scanning electron microscope. Data were analyzed with two-way analysis of variance accompanied by univariate analyses. The bond strength of zirconia cemented with GIC or bonded with RC significantly increased on a Er,Cr:YSGG laser-treated dentin surface ( < 0.05). Dentin preconditioning with an Er,Cr:YSGG laser significantly improved the bond strength of zirconia plates to dentin as compared with untreated dentin.
本研究旨在探讨铒铬钇钪石榴石（Er,Cr:YSGG）激光处理牙本质表面对氧化锆与牙本质之间粘结强度的影响。尽管众所周知，树脂水门汀（RC）可为氧化锆修复体与牙体结构之间提供足够的粘结强度，但许多临床医生对氧化锆材料的粘结可靠性仍持怀疑态度。因此，他们更倾向于使用玻璃离子水门汀（GIC）粘结牙冠。预处理牙本质表面被推荐用于改善用 GIC 或 RC 粘结的牙冠的附着力。最近，Er,Cr:YSGG 激光已广泛用于牙体预备和牙体结构处理。然而，对于在 Er,Cr:YSGG 激光处理后的牙本质上粘结氧化锆牙冠的粘结强度的研究还不够充分。
将 48 颗磨牙在牙冠曲线上方水平切割。24 颗磨牙的平坦牙本质表面未经处理，而另一半磨牙牙本质表面则用 Er,Cr:YSGG 激光（2.78μm，4.5W，8.18J/cm，90mJ，60μs，50Hz，60%空气和 80%水）处理。此外，制备了 48 块氧化锆板，用于在牙本质表面用 GIC 或 RC 粘结。因此，将磨牙分为四组：GIC+未处理牙本质；GIC+处理牙本质；RC+未处理牙本质；RC+处理牙本质。所有样本均进行剪切粘结强度测试。确定失效模式，并准备额外的样本，使用扫描电子显微镜评估粘结剂-牙本质界面。采用双因素方差分析伴随单因素分析对数据进行分析。
在 Er,Cr:YSGG 激光处理的牙本质表面，氧化锆用 GIC 粘结或用 RC 粘结的粘结强度显著增加（<0.05）。与未处理牙本质相比，Er,Cr:YSGG 激光预处理牙本质可显著提高氧化锆板与牙本质的粘结强度。
