Mathew Shibu Thomas, Hegde Mithra N
Department of Conservative Dentistry and Endodontics, A. B. Shetty Memorial Institute of Dental Sciences, Mangalore, India.
J Conserv Dent. 2008 Jan;11(1):30-6. doi: 10.4103/0972-0707.43415.
a) To evaluate the bond strength of eugenol- and non-eugenol-based endodontic sealers to gutta-percha and dentin and b) To make a comparative evaluation of the bond strength of sealers to gutta-percha and dentin.
Seventy-two specimens were used in this study, which was divided into two groups - group I consisting of 36 freshly extracted human molars with 2 mm coronal cut surface; and group II consisting of gutta-percha disks of 10 mm diameter and 2 mm thickness embedded in 36 plaster of Paris specimens. Group I was further divided into three subgroups: subgroup 1, subgroup 2, and subgroup 3, consisting of 12 teeth each; and group II was further divided into three subgroups: subgroup 1, subgroup 2, and subgroup 3, consisting of 12 plaster specimens each. Each subgroup consisted of two materials each, which were placed in 5 mm long sections of polyethylene tubing and were then placed on coronal 2 mm cut surface of human molars; likewise subgroup 1, subgroup 2, and subgroup 3 of group II consisted of two materials each, which were also placed in 5 mm long sections of polyethylene tubing and then placed on gutta-percha disks 10 mm in diameter and 2 mm in thickness, which were embedded in the plaster specimens. After the materials were set, the specimens were subjected to test for shearing bond strength using a universal testing machine (Instron).
Mann-Whitney U test.
Group I, i.e., zinc oxide eugenol sealers, showed more bond to gutta-percha than to dentin, in which subgroup 2b, endomethasone, showed the maximum bond. Group II, i.e., non-zinc oxide eugenol sealers, showed more bond to dentin than to gutta-percha, where the maximum bond was shown by subgroup 3b, EndoRez.
Under the circumstances of this in vitro study, all the six endodontic sealers had significant differences in terms of shear bond strength to gutta-percha and dentin.
a) 评估丁香酚基和非丁香酚基根管封闭剂与牙胶和牙本质的粘结强度；b) 对封闭剂与牙胶和牙本质的粘结强度进行比较评估。
本研究使用了72个样本，分为两组——第一组由36颗新鲜拔除的人类磨牙组成，牙冠切割面为2毫米；第二组由直径10毫米、厚度2毫米的牙胶圆盘组成，嵌入36个石膏样本中。第一组进一步分为三个亚组：亚组1、亚组2和亚组3，每组各12颗牙齿；第二组进一步分为三个亚组：亚组1、亚组2和亚组3，每组各12个石膏样本。每个亚组各包含两种材料，将其置于5毫米长的聚乙烯管段中，然后放置在人类磨牙的2毫米牙冠切割面上；同样，第二组的亚组1、亚组2和亚组3也各包含两种材料，也将其置于5毫米长的聚乙烯管段中，然后放置在直径10毫米、厚度2毫米的牙胶圆盘上，这些牙胶圆盘嵌入石膏样本中。材料凝固后，使用万能试验机（英斯特朗）对样本进行剪切粘结强度测试。
曼-惠特尼U检验。
第一组，即氧化锌丁香酚封闭剂，与牙胶的粘结力比与牙本质的粘结力更强，其中亚组2b的地塞米松显示出最大粘结力。第二组，即非氧化锌丁香酚封闭剂，与牙本质的粘结力比与牙胶的粘结力更强，其中亚组3b的EndoRez显示出最大粘结力。
在本体外研究的条件下，所有六种根管封闭剂在与牙胶和牙本质的剪切粘结强度方面均存在显著差异。
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