Rodriguez-Ferrer H J, Strahan J D, Newman H N
J Clin Periodontol. 1980 Dec;7(6):457-62. doi: 10.1111/j.1600-051x.1980.tb02152.x.
This study was designed to clarify the relationship between amalgam restorations with subgingival overhanging margins and gingival health. This required the presence of such a restoration defect as the sole variable parameter. This was achieved by pairing 26 defective premolar and molar amalgams with similarly defective restorations in the same mouths, test and control being allocated randomly. Test amalgams were contoured to remove overhangs. All other procedures, namely, scaling, polishing and oral hygiene instruction were applied with equal emphasis. Plaque accumulation, gingival inflammation and pocket depths were recorded at 0, 4, 8 and 12 weeks. At the baseline (week 0) there were no significant differences between test and control sides for any of the parameters. Significant differences between test and control sides for all parameters were apparent at all other times. The greatest change took place during the first 4 weeks of the study. It was concluded that the presence of a subgingival overhanging defective margin may be the only important clinically significant feature of an amalgam restoration related to the pathogenesis of chronic inflammatory periodontal disease. It was also demonstrated that correction of defective restorations should be effected during the initial phase of periodontal therapy.
本研究旨在阐明龈下悬突边缘汞合金修复体与牙龈健康之间的关系。这需要存在这种修复体缺陷作为唯一的可变参数。通过将26颗有缺陷的前磨牙和磨牙汞合金与同一口腔中类似有缺陷的修复体配对来实现，测试组和对照组随机分配。对测试汞合金进行塑形以去除悬突。所有其他程序，即洁治、抛光和口腔卫生指导，均同等重视。在0、4、8和12周时记录菌斑积聚、牙龈炎症和牙周袋深度。在基线（第0周）时，测试组和对照组在任何参数上均无显著差异。在所有其他时间，测试组和对照组在所有参数上均存在显著差异。最大的变化发生在研究的前4周。得出的结论是，龈下悬突缺陷边缘的存在可能是汞合金修复体与慢性炎症性牙周病发病机制相关的唯一重要临床显著特征。还表明，有缺陷修复体的矫正应在牙周治疗的初始阶段进行。
