Orr S, Linden G J, Newman H N
Department of Restorative Dentistry, Queen's University of Belfast, UK.
J Clin Periodontol. 1992 Sep;19(8):589-94. doi: 10.1111/j.1600-051x.1992.tb00688.x.
The effect on the gingiva of a variety of relationships of a removable partial denture connector to the gingival margin was investigated in 10 subjects. Acrylic resin baseplates were designed incorporating a variety of relationships of the connector to the gingival margin. The appliances were worn for a 12 hour period daily, for 21 days. At baseline and at days 7, 21 and 49, plaque index, gingival index and probing pocket depth measurements were recorded, and subgingival plaque samples were examined using darkfield microscopy. No increase in plaque accumulation was detected in any area at any time interval. There was a significant increase in gingival index at day 21 in areas where the appliance covered the gingival margin. Small increases in probing pocket depth were recorded at day 21, there being no difference between any of the test areas. Baseline values were re-established by day 49. No significant differences were detected in the percentage of motile organisms or spirochaetes counted in the subgingival plaque samples collected from any area. It was concluded that deterioration in gingival health occurred rapidly following the insertion of a removable appliance, and that coverage of the gingival margin, irrespective of the degree of gingival relief, had a detrimental effect.
在10名受试者中研究了可摘局部义齿连接体与龈缘的多种关系对牙龈的影响。设计了包含连接体与龈缘多种关系的丙烯酸树脂基托。这些矫治器每天佩戴12小时，共佩戴21天。在基线以及第7天、21天和49天，记录菌斑指数、牙龈指数和探诊袋深度测量值，并使用暗视野显微镜检查龈下菌斑样本。在任何时间间隔内，任何区域均未检测到菌斑积聚增加。在矫治器覆盖龈缘的区域，第21天时牙龈指数显著增加。第21天时记录到探诊袋深度有小幅增加，各测试区域之间无差异。到第49天时基线值重新建立。从任何区域采集的龈下菌斑样本中，在活动微生物或螺旋体的计数百分比方面未检测到显著差异。得出的结论是，佩戴可摘矫治器后牙龈健康迅速恶化，并且龈缘的覆盖，无论牙龈缓冲程度如何，都有不利影响。
