Effect of direct retainer and major connector designs on RPD and abutment tooth movement dynamics
Effect of direct retainer and major connector designs on RPD and abutment tooth movement dynamics
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DOI：
10.1111/j.1365-2842.2008.01868.x
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发表时间：
2008-11-01
影响因子：
2.9
通讯作者：
Igarashi, Y.
中科院分区：
文献类型：
--
作者：
Itoh, H.;Baba, K.;Igarashi, Y.
摘要可摘局部义齿的设计对基牙及可摘局部义齿的活动度有一定的影响。本研究旨在研究直接固位体和主要连接体设计对模拟载荷下RPD动力学的影响。在上颌骨模型上制作了六种不同的Kennedy II类上颌RPD。这些义齿包括3种不同的直接固位体（锻丝卡环、RPA卡环和锥形冠套筒固位体）和2种不同的主连接体（钴铬主连接体和热固化丙烯酸树脂与金属加强体）。使用模拟牙周韧带和粘膜，使用硅胶印模材料制作的实验模型，三维位移的RPDs进行了测量下，模拟30 N的负载与位移传感器类型M-3。基牙移动量的2 × 3双向方差分析显示，“直接固位体设计”对颊腭向位移和“主连接体设计”对近远中向位移有显著影响（分别为P < 0.001和P = 0.002）。此外，RPD位移的方差分析显示，“直接固位体设计”对冠顶位移和“主要连接体”对近远中位移有显著影响（分别为P = 0.001和P = 0.028）。刚性直接固位体和刚性连接体减少了基牙和RPD的移动。
Designs of removable partial dentures are suggested to affect the mobility of abutment teeth and removable partial denture (RPD) during oral functions. This study aimed to examine the effect of direct retainer and major connector designs on RPD dynamics under simulated loading. Six different Kennedy class II maxillary RPDs were fabricated on a maxillary model. These dentures involved 3 different direct retainers (wrought-wire clasp, RPA clasp, and conical crown telescopic retainer) and 2 different major connectors (Co-Cr major connector and heat-cured acrylic resin with a metal strengthener). Using an experimental model with simulated periodontal ligaments and mucosa that were fabricated using silicone impression material, three-dimensional displacements of the RPDs were measured under a simulated 30-N loading with a displacement transducer type M-3. Significant effects of "direct retainer design" on bucco-palatal displacements and "major connector" on mesio-distal displacements were revealed by 2 x 3 two-way analysis of variance of abutment teeth movements (P < 0.001 and P = 0.002, respectively). Additionally, analysis of variance of RPD displacements revealed significant effects of "direct retainer design" on corono-apical displacements and "major connector" on mesio-distal displacements (P = 0.001 and P = 0.028, respectively). Rigid direct retainers and rigid major connectors decrease the movements of both abutment tooth and RPD.