Al-Shehri Eman Z, Al-Zain Afnan O, Sabrah Alaa H, Al-Angari Sarah S, Al Dehailan Laila, Eckert George J, Özcan Mutlu, Platt Jeffrey A, Bottino Marco C
Division of Dental Biomaterials, Department of Biomedical and Applied Sciences, Indiana University School of Dentistry, Indianapolis, IN, USA.
Department of Restorative Dental Sciences, King Saud University College of Dentistry, Riyadh, Kingdom of Saudi Arabia.
Restor Dent Endod. 2017 Aug;42(3):206-215. doi: 10.5395/rde.2017.42.3.206. Epub 2017 Jun 5.
To determine the combined effect of fatigue cyclic loading and thermocycling (CLTC) on the shear bond strength (SBS) of a resin cement to zirconia surfaces that were previously air-abraded with aluminum oxide (AlO) particles at different pressures.
Seventy-two cuboid zirconia specimens were prepared and randomly assigned to 3 groups according to the air-abrasion pressures (1, 2, and 2.8 bar), and each group was further divided into 2 groups depending on aging parameters ( = 12). Panavia F 2.0 was placed on pre-conditioned zirconia surfaces, and SBS testing was performed either after 24 hours or 10,000 fatigue cycles (cyclic loading) and 5,000 thermocycles. Non-contact profilometry was used to measure surface roughness. Failure modes were evaluated under optical and scanning electron microscopy. The data were analyzed using 2-way analysis of variance and χ tests ( = 0.05).
The 2.8 bar group showed significantly higher surface roughness compared to the 1 bar group ( < 0.05). The interaction between pressure and time/cycling was not significant on SBS, and pressure did not have a significant effect either. SBS was significantly higher ( = 0.006) for 24 hours storage compared to CLTC. The 2 bar-CLTC group presented significantly higher percentage of pre-test failure during fatigue compared to the other groups. Mixed-failure mode was more frequent than adhesive failure.
CLTC significantly decreased the SBS values regardless of the air-abrasion pressure used.
确定疲劳循环加载和热循环(CLTC)对树脂水门汀与经不同压力的氧化铝(AlO)颗粒空气喷砂处理的氧化锆表面之间剪切粘结强度(SBS)的综合影响。
制备72个长方体氧化锆试件,根据空气喷砂压力(1、2和2.8 bar)随机分为3组,每组再根据老化参数( = 12)进一步分为2组。将Panavia F 2.0置于预处理过的氧化锆表面,在24小时后或10000次疲劳循环(循环加载)和5000次热循环后进行SBS测试。采用非接触轮廓仪测量表面粗糙度。在光学显微镜和扫描电子显微镜下评估失效模式。使用双向方差分析和χ检验分析数据( = 0.05)。
与1 bar组相比,2.8 bar组表面粗糙度显著更高( < 0.05)。压力与时间/循环之间的相互作用对SBS无显著影响,压力也无显著影响。与CLTC相比,储存24小时的SBS显著更高( = 0.006)。与其他组相比,2 bar - CLTC组在疲劳过程中预测试失败的百分比显著更高。混合失效模式比粘结失效更常见。
无论使用何种空气喷砂压力,CLTC均显著降低SBS值。