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. 2021 Oct 7;14(19):5868. doi: 10.3390/ma14195868

Figure 6.

Figure 6

Morphology of the crowns’ outer surfaces. Magnification 50× (A,E) and 500× (B–D,F,G). (A,B): Prefabricated polycarbonate crown; (C): Milled polycarbonate crown (ZPF); (D): Milled polycarbonate crown (TBP); (E,F): 3D-printed polycarbonate crown; (G): Milled PMMA crown. White triangles in “A” point at the parting line. Despite polishing, irregularities and minor defects were observed on the surfaces of all crowns. Gaps between the filaments were observed on outer surfaces of 3D-printed crowns. The surfaces of PMMA crowns were smoother compared to polycarbonate crowns.