Ajami Amir-Ahmad, Bahari Mahmoud, Hassanpour-Kashani Arezoo, Abed-Kahnamoui Mehdi, Savadi-Oskoee Ayda, Azadi-Oskoee Farhad
Assistant Professor, Department of Operative Dentistry, Faculty of Dentistry, Tabriz University of Medical Sciences, Tabriz, Iran.
Dental and Periodontal Research Center, Faculty of Dentistry, Tabriz University of Medical Sciences, Tabriz, Iran.
J Clin Exp Dent. 2017 Jul 1;9(7):e906-e911. doi: 10.4317/jced.53791. eCollection 2017 Jul.
The efficacy of the bond between the restorative materials and the pulp capping materials has an important role in the success of vital pulp therapy. Therefore, the aim of this study was to evaluate the shear bond strength of composite resin and giomer to MTA at different time intervals after mixing of MTA.
Ninety cylindrical MTA samples were prepared and assigned to two groups (n=45) based on the restorative materials used (composite resin or giomer). Each group was subdivided into 3 subgroups (n=15) based on the evaluation intervals (immediately, 2.45 hours and 3 days after mixing MTA). After the bonding procedures, the shear bond strengths of the samples were measured in MPa at a strain rate of 0.5 mm/min. Data were analyzed with repeated-measures ANOVA, post hoc tests and t-test (<0.05).
Bond strength of composite resin was minimum at baseline but it increased significantly 2.45 hours after mixing MTA (=0.002), with no significant changes in bond strength up to three days (=0.08). Bond strength of giomer did not exhibit any significant changes from baseline to 2.45 hours after mixing MTA (P=078); however, at 3 days it reached a minimum (=0.000). In addition, the means of bond strength of composite resin 2.45 hours and 3 days after mixing were significantly higher than those of giomer (=0.001 and =0.000, respectively).
Bond strengths of composite resin 2.45 hours and also 3 days after mixing were significantly higher than those of giomer. In addition, the shear bond strength of giomer decreased over time; however, the shear bond strength of composite resin increased. Composite resin, Giomer, Shear bond strength, Vital pulp therapy.
修复材料与牙髓盖髓材料之间粘结的有效性对活髓治疗的成功起着重要作用。因此，本研究的目的是评估复合树脂和聚酸改性复合树脂在MTA混合后不同时间间隔与MTA之间的剪切粘结强度。
制备90个圆柱形MTA样本，并根据所使用的修复材料（复合树脂或聚酸改性复合树脂）分为两组（n = 45）。每组根据评估时间间隔（MTA混合后立即、2.45小时和3天）再细分为3个亚组（n = 15）。粘结程序完成后，以0.5 mm/min的应变率在MPa下测量样本的剪切粘结强度。数据采用重复测量方差分析、事后检验和t检验进行分析（<0.05）。
复合树脂的粘结强度在基线时最低，但在MTA混合后2.45小时显著增加（P = 0.002），直至三天粘结强度无显著变化（P = 0.08）。聚酸改性复合树脂的粘结强度从基线到MTA混合后2.45小时没有任何显著变化（P = 0.78）；然而，在3天时达到最低（P = 0.000）。此外，复合树脂在MTA混合后2.45小时和3天的粘结强度均值显著高于聚酸改性复合树脂（分别为P = 0.001和P = 0.000）。
复合树脂在MTA混合后2.45小时和3天的粘结强度显著高于聚酸改性复合树脂。此外，聚酸改性复合树脂的剪切粘结强度随时间下降；然而，复合树脂的剪切粘结强度增加。复合树脂、聚酸改性复合树脂、剪切粘结强度、活髓治疗。
