Sismanoglu Soner, Yildirim-Bilmez Zuhal, Erten-Taysi Aysegul, Ercal Pınar
Assistant Professor, Department of Restorative Dentistry, School of Dentistry, University of Altinbas, Istanbul, Turkey.
Assistant Professor, Department of Restorative Dentistry, School of Dentistry, University of Hatay Mustafa Kemal, Hatay, Turkey.
J Prosthet Dent. 2020 Aug;124(2):238.e1-238.e9. doi: 10.1016/j.prosdent.2020.02.029. Epub 2020 May 4.
The repairability of computer-aided design and computer-aided manufacturing (CAD-CAM) composite resins might be adversely affected by the high degree of matrix polymerization that occurs during their manufacturing process. However, information on their repairability is lacking.
The purpose of this in vitro study was to evaluate the microtensile bond strength of CAD-CAM composite resins subjected to simulated repair procedures by using varying surface treatments and universal adhesives.
Four different CAD-CAM blocks (Brilliant Crios, Lava Ultimate, Shofu Block HC, and Vita Enamic) were thermocycled (5000 times, 5/55 °C) and divided into 4 groups according to the surface treatment: control, 9% hydrofluoric acid etching, aluminum oxide airborne-particle abrasion, and tribochemical silica airborne-particle abrasion. After surface treatments, the surface roughness was measured with a nanoindenter and further examined with scanning electron microscopy. After the application of 3 different universal adhesives (Clearfil Universal Bond, Prime&Bond Universal, and Single Bond Universal), the specimens were subjected to a simulated repair process with composite resin. Bonded specimens were cut into 1 mm beams, and microtensile bond strength values were determined until failure at a crosshead speed of 0.5 mm/min. The bond strength data were analyzed with 3-way analysis of variance, and surface roughness data were analyzed with 2-way analysis of variance tests. Pairwise analyses were performed with the Tukey test (α=.05).
All surface treatments effectively improved repair microtensile bond strength values compared with the control (P<.05). Aluminum oxide airborne-particle abrasion had similar mean bond strength values compared with tribochemical silica airborne-particle abrasion (P>.05). Among the CAD-CAM blocks treated with hydrofluoric acid etching, Vita Enamic had the highest mean bond strength values. The highest mean microtensile bond strength repair values with the highest cohesive failure rates were found with the silane-containing universal adhesive (Single Bond Universal).
Surface treatment with aluminum oxide airborne-particle abrasion and tribochemical silica airborne-particle abrasion produced successful repair results for aged resin nanoceramics, whereas hydrofluoric acid etching can be used for aged hybrid ceramic repair. Silane-containing universal adhesive reported increased bond strength. Application of universal adhesive after surface treatment is recommended to increase repair strength.
计算机辅助设计与计算机辅助制造（CAD-CAM）复合树脂的可修复性可能会受到其制造过程中发生的高度基体聚合的不利影响。然而，关于其可修复性的信息却很缺乏。
本体外研究的目的是通过使用不同的表面处理方法和通用粘结剂，评估经过模拟修复程序的CAD-CAM复合树脂的微拉伸粘结强度。
对四种不同的CAD-CAM块体（Brilliant Crios、Lava Ultimate、Shofu Block HC和Vita Enamic）进行热循环（5000次，5/55°C），并根据表面处理方法分为4组：对照组、9%氢氟酸蚀刻、氧化铝空气颗粒研磨和摩擦化学二氧化硅空气颗粒研磨。表面处理后，用纳米压痕仪测量表面粗糙度，并通过扫描电子显微镜进一步检查。在应用3种不同的通用粘结剂（Clearfil Universal Bond、Prime&Bond Universal和Single Bond Universal）后，用复合树脂对试样进行模拟修复过程。将粘结后的试样切成1mm的梁，以0.5mm/min的十字头速度测定微拉伸粘结强度值直至破坏。粘结强度数据采用三因素方差分析，表面粗糙度数据采用双因素方差分析进行分析。采用Tukey检验进行两两分析（α=0.05）。
与对照组相比，所有表面处理均有效提高了修复微拉伸粘结强度值（P<0.05）。氧化铝空气颗粒研磨与摩擦化学二氧化硅空气颗粒研磨的平均粘结强度值相似（P>0.05）。在氢氟酸蚀刻处理的CAD-CAM块体中，Vita Enamic的平均粘结强度值最高。含硅烷的通用粘结剂（Single Bond Universal）获得了最高的平均微拉伸粘结强度修复值和最高的内聚破坏率。
氧化铝空气颗粒研磨和摩擦化学二氧化硅空气颗粒研磨的表面处理对老化的树脂纳米陶瓷产生了成功的修复效果，而氢氟酸蚀刻可用于老化的混合陶瓷修复。含硅烷的通用粘结剂报告粘结强度增加。建议在表面处理后应用通用粘结剂以提高修复强度。
