4种义齿基托材料表面润湿性的实验研究

Experimental study on the surface wettability of four kinds of denture base materials

目的评价临床常用的钴铬合金、钴铬钼合金、纯钛和热凝型义齿基托树脂的润湿性,为临床选择合适的全口义齿基托材料提供理论指导。方法分别测定人工唾液在不同处理的钴铬合金、钴铬钼合金、纯钛、热凝型义齿基托树脂上的接触角,通过接触角大小反应4种材料的润湿性。结果按临床实际磨光处理组的接触角均比磨光成镜面状组的小,且差异具有统计学意义。磨光成镜面状组中热凝型义齿基托树脂接触角最大,其次是纯钛,钴铬合金和钴铬钼合金接触角最小,除钴铬合金和钴铬钼合金外其余材料两两间比较差异均具有统计学意义。临床实际磨光处理组中接触角最大的是纯钛,其次为热凝型义齿基托树脂,钴铬合金和钴铬钼合金接触角最小,除钴铬合金和钴铬钼合金外其余材料两两间比较差异均具有统计学意义。结论钴铬合金和钴铬钼合金润湿性优于纯钛和热凝型义齿基托树脂,从润湿性对固位力的影响角度考虑,选择这两种材料制作全口义齿基托对全口义齿的固位更加有利。

Objective To evaluate the wettability of the commonly-used clinical materials including Co-Cr alloy, Co-Cr-Mo alloy, pure titanium as well as heat-curing denture base resin in order to provide theoretical guidance for choosing the suitable clinical materi- als for complete denture base. Methods The contact angles were tested respectively when artificial saliva was dropped on differently treated Co-Cr alloy, Co-Cr-Mo alloy, pure titanium and heat-curing denture base resin samples. The wettability of the four kinds of ma- terials was reflected by the contact angles. Results ①All the tbur kinds of materials had a smaller contact angle in group polishing in the same manner as clinical practice when compared with the high polishing group and the difference was statistically significant. ②In high polishing group, heat-curing denture base resin had the largest contact angle, followed by titanium, Co-Cr alloy and Co-Cr-Mo al- loy had the minimum contact angle. There was statistically significant difference between different materials with paired comparison ex- cept Co-Cr alloy and Co-Cr-Mo alloy. ③In groups polishing in the same manner as clinical practice, pure titanium had the largest con- tact angle, followed by heat-curing denture base resin, Co-Cr alloy and Co-Cr-Mo alloy. The differences between different materials were statistically significant except the Co-Cr alloy and Co-Cr-Mo alloy. Conclusions Co-Cr alloy and Co-Cr-Mo alloy had better wet- tability than pure titanium and heat-curing denture base resin. Considering the influence of wettability on retention force, we should choose Co-Cr alloy and Co-Cr-Mo as complete denture base materials as they are better for the retention.