Yilmaz Yucel, Gurbuz Taskin, Eyuboglu Ozge, Belduz Nihal
Department of Pedodontics, Atatürk University, Faculty of Dentistry, Erzurum, Turkey.
Pediatr Dent. 2008 Sep-Oct;30(5):429-35.
This study's purposes were to determine the shear bond strength (SBS) for and to perform dye penetration (microleakage) and scanning electron microscopy (SEM) evaluations of preveneered posterior stainless steel crowns (SSCs) that were repaired using 2 different materials.
Twenty-two crowns were used. They were stored in artificial saliva for 30 days and then thermocycled. A force was applied on the crowns' occlusal surfaces until the original veneer material appeared to be fractured. The fracture types and S8S values were recorded. The crowns were then repaired using Panavia opaque cement and Tetric Flow or Monoopaque and Tetric Flow. Twenty of the repaired crowns were subjected to dye penetration and SBS tests, and the remaining 2 were evaluated using SEM.
Statistical analysis revealed no statistically significant differences in the results of either the S8S or the dye penetration test (P = .58 and P = 38, respectively). A statistically significant difference was found between original and repaired crowns regarding fracture extent (P = .02), but not failure type (P = .08). SEM evaluation showed that there was no observable gap at the interface of the original or repaired materials and the stainless steel base.
Preveneered posterior stainless steel crowns may be repaired using either repair material types tested here.
本研究旨在确定使用两种不同材料修复的预贴面后牙不锈钢冠（SSC）的剪切粘结强度（SBS），并进行染料渗透（微渗漏）和扫描电子显微镜（SEM）评估。
使用了22个牙冠。将它们储存在人工唾液中30天，然后进行热循环处理。在牙冠的咬合面上施加力，直到原始贴面材料出现断裂。记录断裂类型和SBS值。然后使用Panavia不透明粘结剂和Tetric Flow或Monoopaque和Tetric Flow修复牙冠。对20个修复后的牙冠进行染料渗透和SBS测试，其余2个使用SEM进行评估。
统计分析显示，SBS测试结果或染料渗透测试结果均无统计学显著差异（分别为P = 0.58和P = 0.38）。在原始牙冠和修复后的牙冠之间，在骨折程度方面发现有统计学显著差异（P = 0.02），但在失败类型方面没有差异（P = 0.08）。SEM评估表明，在原始或修复材料与不锈钢基底的界面处没有观察到间隙。
预贴面后牙不锈钢冠可以使用此处测试的任何一种修复材料类型进行修复。
