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. 2020 Sep 30;13(19):4349. doi: 10.3390/ma13194349

Figure 2.

Figure 2

The control ((A) no defect) and three different types of defects were prepared ((B) three-wall defect, (C) one-wall defect, and (D) circumferential defect). Each defect was set at a depth of exactly 4 mm.