Ranjbar Omidi Baharan, Karimi Yeganeh Parnian, Oveisi Sonia, Farahmandpour Negin, Nouri Fahimeh
Department of Operative Dentistry, School of Dentistry, Qazvin University of Medical Sciences, Qazvin, Iran.
Department of Metabolic Research Center, Tehran University of Medical Sciences, Tehran, Iran.
J Lasers Med Sci. 2018 Summer;9(3):200-206. doi: 10.15171/jlms.2018.36. Epub 2018 Jul 28.
Increased demand for metal free fixed partial denture in recent years led to the developing of all ceramic material with excellent mechanical properties. One of the most popular all ceramic is zirconia which shows poor bonding properties. Recently, universal primer contains of silane and phosphate monomer for bond to zirconia have been introduced. The aim of this study is determination of the best method for bonding to zirconia based on the selection of the correct primer, suitable adhesive and best surface pretreatment. In this in vitro experimental study 16 sintered-zirconia blocks prepared in dimension of (18×6×2 mm) by CAD/CAM technology. Sample cleansed by ultrasonic device contain of 96% ethanol in 6 minutes, after air-drying, based on surface treatment randomly divided into 4 groups which each group divided into 2 sub-groups based on the use of a primer or universal bond: (1) no treatment: (a) cement + zirconia primer, (b) cement + universal bond. (2) Alumina pretreatment: (a) cement + zirconia primer, (b) cement + universal bond. (3) Cojet sand pretreatment: (a) cement + zirconia primer, (b) cement + universal bond. (4) laser pretreatment (a) cement + zirconia primer, (b) cement + universal bond. Composite disc prepared with condensation of composite resin in Tygon tube with integral diminution of 0.7 mm which cured for 40 sconds. Universal bond or zirconia primmer apply on the surface of the zirconia samples then cemented to composite disks by Panavia F2 according manufacture instructions. Microshear bond strength determined with universal testing machine. Failure mode assessed under stereomicroscope. Selected sample based on surface treatment evaluated under SEM. Data were analyzed using one-way analysis of variance (ANOVA). Comparison of the 4 surface treatment groups revealed a significant difference and the highest bond belonged to Cojet and the lowest one to laser group. It seems that Universal Adhesive can to be considered as an alternative to bond to zirconia but the Cojet method is still required.
近年来，对无金属固定局部义齿的需求增加，促使人们开发出具有优异机械性能的全陶瓷材料。最受欢迎的全陶瓷材料之一是氧化锆，但其粘结性能较差。最近，已推出含有硅烷和磷酸盐单体以粘结氧化锆的通用底漆。本研究的目的是基于正确底漆的选择、合适的粘结剂和最佳的表面预处理，确定粘结氧化锆的最佳方法。在这项体外实验研究中，通过CAD/CAM技术制备了16个尺寸为(18×6×2 mm)的烧结氧化锆块。样品用含有96%乙醇的超声装置清洗6分钟，风干后，根据表面处理随机分为4组，每组根据是否使用底漆或通用粘结剂再分为2个亚组：(1)不处理：(a)粘结剂+氧化锆底漆，(b)粘结剂+通用粘结剂。(2)氧化铝预处理：(a)粘结剂+氧化锆底漆，(b)粘结剂+通用粘结剂。(3)Cojet砂预处理：(a)粘结剂+氧化锆底漆，(b)粘结剂+通用粘结剂。(4)激光预处理(a)粘结剂+氧化锆底漆，(b)粘结剂+通用粘结剂。用复合树脂在泰根管中冷凝制备复合盘，整体尺寸减小0.7 mm，固化40秒。将通用粘结剂或氧化锆底漆涂覆在氧化锆样品表面，然后按照生产说明用Panavia F2粘结到复合盘上。用万能试验机测定微剪切粘结强度。在立体显微镜下评估失效模式。基于表面处理选择的样品在扫描电子显微镜下进行评估。数据采用单因素方差分析(ANOVA)进行分析。4个表面处理组的比较显示出显著差异，粘结强度最高的是Cojet组，最低的是激光组。似乎通用粘结剂可被视为粘结氧化锆的替代品，但仍需要Cojet方法。
