Synthesis of a novel functional monomer and development of an adhesive system appropriate to laser-irradiated dental tissues

简介：Er:YAG激光在治疗龋齿过程中，由于没有空气涡轮和微电机带来的噪音和振动的不愉快，并且不需要麻醉治疗，因此受到了人们的关注。然而，我们发现传统的牙科粘合剂系统在Er:YAG激光照射的牙齿表面上表现不佳，而且其原因之一是激光照射后牙齿表面的弱点。因此，鉴于其重要性和临床意义，我们旨在阐明Er:YAG激光照射后的牙齿结构及其作为粘接表面的质量，并开发适合于该表面的新型粘接系统。材料与方法：1)粘接表面制备：Erwin， Morita公司的Er:YAG激光，127mJ, 10pps， 2秒照射牙本质，69mJ, 10pps， 2秒照射牙本质。2)用三嗪-、氨基乙酸-、多酚-、环氧甲基丙烯酸酯/HEMA和醇配制了粘接体系的引物。3)用各种类型的底漆、磷酸埃斯特胶粘剂对上述粘接表面进行处理，并填充复合树脂（Clearfil APX, Kuraray Co.），然后在37□的水中浸泡24小时，然后进行粘接强度测量。结果与讨论：环氧型底漆体系对Er:YAG激光照射牙釉质表面的结合强度为：牙釉质18.6MPa（对照：Megabond/Kuraray Co.; 12MPa），牙本质17.2MPa（对照：9MPa）。作者说，这些结果可能是由于激光照射牙齿粘合剂表面时产生的微裂纹所产生的空间中存在氧气。由于对照组使用的常规牙胶粘剂为自由基聚合型，在氧气存在的情况下，聚合反应明显减弱。另一方面，本研究测试的开环聚合型树脂在反应过程中可能不受氧气存在的影响。少

Introduction: The use of Er:YAG laser for catty preparations during treatment of dental caries has received attention because there is no unpleasantness of noise and vibration as with air turbine and micromotor, and there is no need of anesthesia for treatment. However, we found that conventional dental adhesive systems do not perform sufficiently well on Er:YAG laser irradiated dental surfaces, and moreover, one of its reasons is the weakness of dental surfaces after laser irradiation. So, due to its importance and clinical significance, we aimed to clarify the dental structure after Er:YAG laser irradiation and its quality as an adhesive surface, along with the development of a new adhesive system appropriate to this surface.Materials and Methods: 1) Adhesive surfaces preparation: Er:YAG laser (Erwin, Morita Co.) was irradiated with 127mJ, 10pps for 2 sec for enamel and with 69mJ, 10pps for 2 sec for dentin. 2) The primers of the adhesive systems were prepared with triazine-, aminoac … More id-, and epoxy-methacrylate/HEMA and alcohol. 3) The adhesive surfaces above were treated with each type of primer, phosphoric acid esther bonding agent and filled with composite resin (Clearfil APX, Kuraray Co.), then immersed in water at 37□for 24 hours before bond strength measurements.Results and Discussion: The bond strength of epoxy type primer system to Er:YAG laser irradiated dental adhesive surfaces was 18.6MPa for enamel (control: Megabond/Kuraray Co.; 12MPa), and 17.2MPa for dentin (control: 9MPa). The authors say that these results may be due to oxygen that exists in the space created by microcracks that occurred during laser irradiation of dental adhesive surfaces. As conventional dental adhesives, used in the control group, are of radical polymerization type, the polymerization reaction decrease remarkably in the presence of oxygen. On the other hand, the ring opening polymerization type resin tested in this study may be not much influenced by the presence of oxygen during reaction. Less