Mesgarzadegan Mozhan, Hooshmand Tabassom, Akbari Pardis
Department of Dental Biomaterials, School of Dentistry, Tehran University of Medical Sciences, Tehran, Iran.
Dental Research Center, Dentistry Research Institute, Tehran University of Medical Sciences, Tehran, Iran.
Front Dent. 2023 Dec 16;20:44. doi: 10.18502/fid.v20i44.14419. eCollection 2023.
The purpose of this study was to compare the effect of plasma irradiation and other surface preparation methods on the microtensile bond strength of repaired resin composites. Twenty molds of a universal nanohybrid composite were prepared, aged and subjected to thermocycling. The specimens were divided into 5 groups for surface preparations including, C (Control): application of GC G-Premio Bond (GP) only; SB: sandblasting with alumina and GP; SI: application of phosphoric acid etching, silane, and unfilled resin; RB: roughening by diamond bur, phosphoric acid etching and GP; PL: application of argon and atmosphere plasma and then GP. The specimens were repaired with the new resin composite, cut to 1mm beam, and then subjected to thermocycling. The microtensile bond strengths were measured using a universal testing machine. The failure modes were assessed with a stereomicroscope. Data were analyzed using two-way ANOVA and Tukey's test. The level of significance was α=0.05. The highest mean bond strength was found for the application of universal bonding GC GP in controls (26.62MPa) and the lowest average bond strength belonged to the SI groups (9.06MPa). The difference in the mean bond strength between the SI group and other groups was significant (P<0.05). The failure mode of specimens in all groups was predominantly adhesive. The application of GP as an intermediate universal adhesive established a proper bond between the old and new resin composite. In addition, the plasma application and other surface preparation methods did not significantly improve the bond strength.
本研究的目的是比较等离子体辐照和其他表面处理方法对修复后的树脂复合材料微拉伸粘结强度的影响。制备了20个通用纳米混合复合材料模具，进行老化处理并进行热循环。将试样分为5组进行表面处理，包括：C（对照组）：仅应用GC G-Premio Bond（GP）；SB：用氧化铝喷砂并应用GP；SI：应用磷酸蚀刻、硅烷和未填充树脂；RB：用金刚石车针粗化、磷酸蚀刻并应用GP；PL：应用氩气和大气等离子体然后应用GP。用新型树脂复合材料修复试样，切割成1mm的梁，然后进行热循环。使用万能试验机测量微拉伸粘结强度。用体视显微镜评估失效模式。数据采用双向方差分析和Tukey检验进行分析。显著性水平为α=0.05。对照组中应用通用粘结剂GC GP时的平均粘结强度最高（26.62MPa），而SI组的平均粘结强度最低（9.06MPa）。SI组与其他组之间的平均粘结强度差异显著（P<0.05）。所有组试样的失效模式主要为粘结型。应用GP作为中间通用粘结剂在新旧树脂复合材料之间建立了良好的粘结。此外，等离子体应用和其他表面处理方法并未显著提高粘结强度。
