Fig. 4
From: Advantages and feasibility of prefabricated PEEK crowns for aesthetic restoration in primary teeth
The surface wettability of PEEK specimens before and after sandblasting and acid etching treatments. (a-c) Water contact angle; (d-f) Artificial saliva contact angle, respectively; (g, h) Water contact angle and Artificial saliva contact angle of three pretreatments. Values have been expressed as mean ± SD (*, P ≤ 0.05; **, P ≤ 0.01; ***, P ≤ 0.001; one-way ANOVA).
