OBJECTIVES The study evaluated the influence of the number of retention grooves and the retainer wing thickness on the retention of resin-bonded attachments (RBAs). METHODS Overall, 64 extracted human teeth were prepared, whereby the number of retention grooves (4, 2, 1, or no grooves) and the material thickness (0.7 or 0.5 mm) of the RBAs were varied. This resulted in eight groups with eight specimens each. A sample size of eight specimens per group was chosen because the chewing simulator used for dynamic loading can load eight specimens at a time. After the size of the adhesive area was determined, the abutment teeth were provided with RBAs and subjected to a dynamic loading with thermal cycling. Finally, the failure load was examined using a retention test. RESULTS The mean failure loads ranged from 152 ± 50 N to 228 ± 32 N. There had been a significant interaction between the two main factors, i.e., number of retention grooves and material thickness. Neither the number of retention grooves nor the size of the adhesive area had a significant influence on the failure load. CONCLUSIONS Using a reduced number of retention grooves seems reasonable. However, clinical considerations suggest using two retention grooves to simplify the preparation and bonding procedures. CLINICAL RELEVANCE The retention of resin-bonded attachments is promising and supports the clinical application of this minimally invasive treatment modality.

中文翻译：

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制剂形式对可移动假牙的树脂结合附件保持力的影响。

目的研究评估了固位槽数量和固位翼厚度对树脂结合附件（RBA）固位的影响。方法总共准备了64颗拔出的人类牙齿，从而改变了RBA的固位槽数量（4、2、1或无槽）和材料厚度（0.7或0.5 mm）。这导致了八组，每组八个标本。每组选择八个样本的样本大小是因为用于动态加载的咀嚼模拟器可以一次加载八个样本。确定粘合区域的大小后，在基台齿上设置RBA，并通过热循环对其施加动态​​载荷。最后，使用保留测试检查了失效载荷。结果平均故障负载范围为152±50 N至228±32N。在两个主要因素（即固定槽的数量和材料厚度）之间存在显着的相互作用。固位槽的数量和粘合区域的大小都不会对破坏载荷产生重大影响。结论使用减少数量的固位槽似乎是合理的。然而，临床考虑建议使用两个固位槽来简化制备和粘合程序。临床相关性保留树脂结合的附件是有希望的，并支持这种微创治疗方式的临床应用。结论使用减少数量的固位槽似乎是合理的。然而，临床考虑建议使用两个固位槽来简化制备和粘合程序。临床相关性保留树脂结合的附件是有希望的，并支持这种微创治疗方式的临床应用。结论使用减少数量的固位槽似乎是合理的。然而，临床考虑建议使用两个固位槽来简化制备和粘合程序。临床相关性保留树脂结合的附件是有希望的，并支持这种微创治疗方式的临床应用。