Polychronakis Nick, Sotiriou Michael, Zissis Alcibiades
Division of Removable Prosthodontics, Dental School, National and Kapodistrian University of Athens, Greece.
Acta Stomatol Croat. 2014 Sep;48(3):199-207. doi: 10.15644/asc48/3/4.
The aim of this survey was to record removable partial denture (RPD) retentive elements and abutment teeth in partially edentulous patients, identified in commercial laboratories in Athens, Greece.
628 master casts with the corresponding cast metal frameworks used in the construction of RPDs were evaluated. Casts were photographed to identify the number and position of existing teeth, the partial edentulism class and the retentive elements. Prevalence tables and the x(2) test were used for the statistical analysis of the collected data (α=.05).
There were 276 maxillary (43.9%) and 352 (56.1%) mandibular casts. Maxillary edentulism entailed almost a total absence of right third molars in 96.7% and left third molars 96.0% of casts, with lower rates for the first and second molars. Edentulism in the posterior mandible presented a similar pattern. The most profound findings concerning retentive elements were: 91.9% of the retainers used were clasps and the remaining 8.1% were attachments. Of the clasps used, 48.9% were of the Roach Τ type, a finding more common in Kennedy Class I as compared to other Kennedy Classes (p<0.01). The circumferential clasps accounted for 19.3% of the total clasps used, and it was less frequently presented (8.8%) in Kennedy I Classes (p<0.01).
Roach clasps were used in the majority of cases whereas RPI clasps and attachments were rarely used.
本调查旨在记录希腊雅典商业实验室中部分牙列缺损患者的可摘局部义齿（RPD）固位元件和基牙情况。
对628个用于制作RPD的主模型及相应的铸造金属支架进行评估。拍摄模型照片以确定现存牙齿的数量和位置、部分牙列缺损分类以及固位元件。使用患病率表和x²检验对收集的数据进行统计分析（α = 0.05）。
上颌模型有276个（43.9%），下颌模型有352个（56.1%）。上颌牙列缺损时，96.7%的模型几乎完全缺失右侧第三磨牙，96.0%的模型几乎完全缺失左侧第三磨牙，第一和第二磨牙的缺失率较低。下颌后牙列缺损呈现类似模式。关于固位元件的最显著发现是：使用的固位体中91.9%为卡环，其余8.1%为附着体。在使用的卡环中，48.9%为Roach Τ型，与其他肯尼迪分类相比，在肯尼迪I类中更常见（p<0.01）。环形卡环占所用卡环总数的19.3%，在肯尼迪I类中出现频率较低（8.8%）（p<0.01）。
大多数情况下使用Roach卡环，而RPI卡环和附着体很少使用。
