Pathak Sidhant, Shashibhushan K K, Bharath K P, Poornima P, Reddy V V Subba
Department of Pedodontics and Preventive Dentistry, College of Dental Sciences, Davangere, Karnataka, India.
Pediatr Dent. 2015 Jul-Aug;37(4):339-41.
The purpose of this study was to evaluate and compare the effect of placing vertical grooves, sandblasting, and luting cements on the retention of stainless steel crowns (SSCs).
Eighty extracted primary molars were mounted in acrylic blocks. Specimens were divided into Group 1 (RelyX U200) and Group 2 (Smart Cem2). Teeth in each group were further subdivided into Subgroup A (no vertical grooves and no sandblasting), Subgroup B (vertical grooves), Subgroup C (sandblasting of crowns), and Subgroup D (vertical grooves and sandblasting of crowns). After cementation, SSCs were pulled off using a universal testing machine. One-way analysis of variance was used for statistical analyses.
In Groups 1 and 2, the highest retentive strengths were found in Subgroup D (1,124 and 783 kPa, respectively), followed by Subgroup C (1,066 and 748 kPa, respectively), Subgroup A (762 and 356 kPa, respectively), and Subgroup B (743 and 314 kPa, respectively). Retentive strength in Group one was significantly higher than in Group two; Subgroups A and B were significantly lower than C and D.
RelyX U200 showed higher retentive strength than Smart Cem2. Sandblasting increased the retention strength, whereas a vertical groove had no significant effect on retention.
本研究旨在评估和比较制备垂直沟、喷砂处理以及使用粘结水门汀对不锈钢冠（SSC）固位力的影响。
将80颗拔除的乳牙固定于丙烯酸树脂块中。样本分为第1组（RelyX U200）和第2组（Smart Cem2）。每组牙齿再进一步细分为A亚组（无垂直沟且无喷砂处理）、B亚组（有垂直沟）、C亚组（冠部喷砂）和D亚组（有垂直沟且冠部喷砂）。粘结后，使用万能试验机将不锈钢冠拔除。采用单因素方差分析进行统计学分析。
在第1组和第2组中，D亚组的固位力最高（分别为1124 kPa和783 kPa），其次是C亚组（分别为1066 kPa和748 kPa）、A亚组（分别为762 kPa和356 kPa）、B亚组（分别为743 kPa和314 kPa）。第1组的固位力显著高于第2组；A亚组和B亚组显著低于C亚组和D亚组。
RelyX U200显示出比Smart Cem2更高的固位力。喷砂处理可提高固位力，而垂直沟对固位力无显著影响。
