Akyil Musa Samil, Yilmaz Asude, Karaalioğlu Osman F, Duymuş Zeynep Y
Department of Prosthodontics, School of Dentistry, University of Atatürk, Erzurum, Turkey.
Photomed Laser Surg. 2010 Aug;28(4):539-45. doi: 10.1089/pho.2009.2586.
The purpose of this study was to evaluate the shear bond strength of a repair composite resin to a feldspathic ceramic surface that had been either etched with 9.5% hydrofluoric acid (HFA), irradiated by an Er:YAG or Nd:YAG laser, or etched with 9.5% HFA after being irradiated by each laser type.
New findings have shown that combined laser irradiation and acid etching of a ceramic surface can be used to roughen ceramic surfaces.
Seventy-eight feldspathic ceramic discs were assigned to six surface treatment groups (n = 13): C, no treatment; HFA, 9.5% HFA etching; ER, Er:YAG laser irradiation; ND, Nd:YAG laser irradiation; ER + HFA, Er:YAG laser irradiation followed by HFA etching; ND + HFA, Nd:YAG laser irradiation followed by HFA etching. The surface of one disc from each treatment group was examined under a scanning electron microscope. After the surface treatments and silanization, a repair composite resin was applied to each disc using a commercial ceramic repair kit. Shear bond strength testing was then done after storing the specimens in distilled water for 24 h at 37 degrees C and thermocycling. Each ruptured specimen was examined under a stereoscopic light microscope.
The highest shear bond strength was found after HFA etching, and the lowest was found after Er:YAG laser irradiation. HFA etching also caused the most pronounced changes of all the surface treatments. When HFA was applied after either laser irradiation, the fissures and cracks were larger than those seen on the only laser-irradiated surfaces.
HFA etching is the most effective surface treatment for increasing the shear bond strength between a repair composite resin and a feldspathic ceramic surface. The shear bond strength after laser irradiation can be increased by HFA etching, but the strength of the bond is still smaller than that after HFA etching alone.
本研究旨在评估修复复合树脂与经9.5%氢氟酸（HFA）蚀刻、铒钇铝石榴石（Er:YAG）或钕钇铝石榴石（Nd:YAG）激光照射，或每种激光照射后再用9.5% HFA蚀刻的长石质陶瓷表面之间的剪切粘结强度。
新的研究结果表明，陶瓷表面的激光照射与酸蚀刻相结合可用于使陶瓷表面粗糙化。
将78个长石质陶瓷圆盘分为六个表面处理组（n = 13）：C组，未处理；HFA组，9.5% HFA蚀刻；ER组，Er:YAG激光照射；ND组，Nd:YAG激光照射；ER + HFA组，Er:YAG激光照射后进行HFA蚀刻；ND + HFA组，Nd:YAG激光照射后进行HFA蚀刻。在扫描电子显微镜下检查每个处理组的一个圆盘表面。表面处理和硅烷化后，使用商用陶瓷修复套件将修复复合树脂应用于每个圆盘。将标本在37℃蒸馏水中储存24小时并进行热循环后，进行剪切粘结强度测试。在立体光学显微镜下检查每个断裂的标本。
HFA蚀刻后剪切粘结强度最高，Er:YAG激光照射后最低。HFA蚀刻在所有表面处理中引起的变化也最为明显。当在任何一种激光照射后应用HFA时，裂缝比仅激光照射表面上的裂缝更大。
HFA蚀刻是提高修复复合树脂与长石质陶瓷表面之间剪切粘结强度的最有效表面处理方法。激光照射后的剪切粘结强度可通过HFA蚀刻提高，但粘结强度仍小于单独HFA蚀刻后的强度。
