Tavakolizadeh Sara, Dehghan Mohamad, Ghoveizi Rahab, MScD Dmd, Fayyazi Anahita
Dept. of Prosthodontics, School of Dentistry, Shahid Beheshti University of Medical Sciences, Tehran, Iran.
Post Graduate Student of Prosthodontics, Dept. of Prosthodontics, School of Dentistry, Shahid Beheshti University of Medical Sciences, Tehran, Iran.
J Dent (Shiraz). 2021 Jun;22(2):138-143. doi: 10.30476/DENTJODS.2020.86215.1176.
Different materials can be used to reconstruct the core foundation in all-ceramic restorations. Bond strength of the core material to zirconia is an important factor in long-term restoration success.
The aim of this study was to assess shear bond strength (SBS) of zirconia to four different core materials.
In this experimental study, 40 zirconia ceramic disks (10×3 mm) were prepared and divided to four groups based on core material. Cylinder shaped core specimens (3×4 mm) of non-precious gold alloy (NPG), zirconia ceramic, natural dentin, and composite resin were prepared and bonded perpendicularly to the zirconia disks using Gillmore Needle Apparatus and dual cure resin cement. All samples were thermocycled for 2000 cycles. To evaluate SBS, the specimens were tested by universal testing machine. Data were analyzed using Kruskal-Wallis test followed by Dunn's test with Bonferroni correction. Statistical significance was set at < 0.05.
The highest values for SBS were achieved in composite resin group (11.58±1.74 MPa) followed by NPG (10.32±0.94 MPa), zirconia (7.3±1.11 MPa) and dentin group (6.53±0.56 MPa). SBS in composite resin and NPG core materials were significantly higher than other core materials (< 0.05).
Composite resin and NPG cores showed significant higher bond strength to zirconia in comparison to dentine and zirconia core materials.
在全瓷修复体中，可以使用不同材料来重建核心基础。核心材料与氧化锆的粘结强度是长期修复成功的一个重要因素。
本研究的目的是评估氧化锆与四种不同核心材料的剪切粘结强度（SBS）。
在本实验研究中，制备了40个氧化锆陶瓷盘（10×3毫米），并根据核心材料分为四组。制备了非贵金属合金（NPG）、氧化锆陶瓷、天然牙本质和复合树脂的圆柱状核心标本（3×4毫米），并使用吉尔摩针装置和双固化树脂粘结剂垂直粘结到氧化锆盘上。所有样本进行2000次热循环。为了评估SBS，通过万能试验机对标本进行测试。使用Kruskal-Wallis检验，随后进行Dunn检验并进行Bonferroni校正来分析数据。统计学显著性设定为<0.05。
复合树脂组的SBS值最高（11.58±1.74兆帕），其次是NPG（10.32±0.94兆帕）、氧化锆（7.3±1.11兆帕）和牙本质组（6.53±0.56兆帕）。复合树脂和NPG核心材料的SBS显著高于其他核心材料（<0.05）。
与牙本质和氧化锆核心材料相比，复合树脂和NPG核心与氧化锆的粘结强度显著更高。
