Schiller Simone, Rustemeier Elke, Kraus Dominik, Stark Helmut, Müller Frauke, Utz Karl-Heinz
Independent Researcher, Kastanienstraße 10, 53340 Meckenheim, Germany.
Global Precipitation Climatology Centre, Deutscher Wetterdienst, Frankfurter Straße 135, 63067 Offenbach am Main, Germany.
Materials (Basel). 2022 Jul 30;15(15):5285. doi: 10.3390/ma15155285.
The majority of complete dentures are still conventionally manufactured using a flask-and-pack technique. However, the polymerization process may introduce a distortion of the denture body. The aim of this study was to evaluate the three-dimensional fit of the posterior palatal seal of maxillary complete dentures with the original impression, and to give recommendations for scraping.
Four autopolymerising resins were used to manufacture 40 palatal plates each for high, medium and flat palates (total n = 120). The misfit was captured by taking a reline impression with a highly fluid silicone, the dimensions of which were measured with a flat-bed scanner.
The shape of the palate had a significant impact (median = 0.0435), but not the resin type (median = 0.2575). It was largest for the flat palate and smallest for the high palate. The largest misfit was observed in the palatal midline area (flat-palate average median: 685 µm; high and medium palates: 620 µm) decreasing towards the lateral and anterior regions.
The results suggest compensating for the palatal misfit that occurs with autopolymerising resins by scraping a postdam of an approximately 0.7 mm depth to the master cast, decreasing towards the anterior and lateral areas. In high and medium palates, the scraping could be less pronounced.
大多数全口义齿仍采用传统的装盒和充填技术制作。然而，聚合过程可能会导致义齿主体变形。本研究的目的是评估上颌全口义齿后腭部封闭区与原始印模的三维贴合度，并给出刮除建议。
使用四种自凝树脂分别制作高腭、中腭和平腭的腭板各40个（共n = 120个）。通过用高流动性硅橡胶制取重衬印模来捕捉不贴合情况，并用平板扫描仪测量其尺寸。
腭部形状有显著影响（中位数 = 0.0435），但树脂类型无显著影响（中位数 = 0.2575）。平腭的不贴合度最大，高腭的最小。在腭部中线区域观察到最大的不贴合（平腭平均中位数：685 µm；高腭和中腭：620 µm），向外侧和前部区域逐渐减小。
结果表明，通过在主模型上刮出一个深度约为0.7 mm、向前部和外侧区域逐渐减小的后堤区，可补偿自凝树脂产生的腭部不贴合。对于高腭和中腭，可以减少刮除程度。
