Effect of implant support on distal extension removable partial dentures:: in vitro assessment
Effect of implant support on distal extension removable partial dentures:: in vitro assessment
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DOI：
10.1111/j.1365-2842.2006.01641.x
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发表时间：
2007-01-01
影响因子：
2.9
通讯作者：
Hosoi, T.
中科院分区：
文献类型：
--
作者：
Ohkubo, C.;Kurihara, D.;Hosoi, T.
种植支撑可移动局部义齿（RPD）的种植体被放置在无牙嵴中以稳定可移动局部义齿并减少由此产生的旋转运动。本研究探讨种植体放置对RPD稳定性的影响。采用环氧树脂和硅酮印模材料分别制备薄（1 mm）和厚（2 mm）软组织，模拟下颌双侧远端伸缺失模型。5个压力传感器（PS-10K, Kyowa, Tokyo, Japan）连接在左、右第一磨牙（#36和#46）、第一前磨牙（#34和#44）和中舌牙槽嵴附近。5个双侧远端延伸rpd与Co-Cr框架常规制作。种植体放置在双侧第二磨牙区域后，用自聚合树脂将愈合帽（4.5 mm高）连接到义齿基托上以支持RPD。与传统的RPD一样，密封螺钉无需连接即可放置。施加最大5kg的载荷，同时测量rpd （n = 5）的压力和位移，并使用Wilcoxen测试（alpha = 0.05）进行分析。与常规RPD相比，种植体支持RPD对薄、厚软组织、#36、#46和中舌牙槽嵴的压力均较小（P < 0.05）。两组rpd间34、44号压力差异无统计学意义（P < 0.05）。种植RPD的义齿位移明显小于常规义齿（P < 0.05）。种植体支持有助于防止远端延伸rpd的移位，减少对软组织的压力。
The implants in implant-supported removable partial dentures (RPDs) are placed in the edentulous ridge to stabilize the RPD and minimize the resultant rotational movement. This study investigated the effect of implant placement on RPD stability. A model simulating a mandibular bilateral distal extension missing was fabricated using epoxy resin and silicone impression material as thin (1 mm) and thick (2 mm) soft tissues. Five pressure sensors (PS-10K, Kyowa, Tokyo, Japan) were attached near the left and right first molars (#36 and #46), first premolars (#34 and #44) and medio-lingual alveolar crest. Five bilateral distal extension RPDs with Co-Cr frameworks were conventionally fabricated. After the implants were placed at the bilateral second molar areas, healing caps (4.5 mm high) were connected to the denture base with autopolymerized resin to support the RPD. As in a conventional RPD, sealing screws were placed without connecting them. Loads up to 5 kg were applied, and the pressure and displacement of the RPDs (n = 5) were simultaneously measured and analysed using the Wilcoxen test (alpha = 0.05). There was less pressure on both thin and thick soft tissues, the #36, #46 and the medio-lingual alveolar crest from the implant-supported RPD than from the conventional RPD (P < 0.05). There were no significant differences in pressure on #34 and #44 between the two RPDs (P > 0.05). There was significantly less denture displacement of the implant-supported RPD than of the conventional denture (P < 0.05). Implant support helped prevent the displacement of distal extension RPDs and decreased the pressure on soft tissues.