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. 2021 Mar 25;21:157. doi: 10.1186/s12903-021-01522-2

Fig. 2.

Fig. 2

Three-dimensional digital measurement of the left upper lateral incisor between BL and 2w post-op. measurement of GRH, GRW, and REA on the BL model (a); similar surfaces of the teeth on the BL (b) and 2w (c) models were selected as the registration area (depicted in red); the two digital models overlapped for superimposition (d); manually trace of the postoperative gingival area gain (e); measurement of GHG and GAG on the BL model (f); closing the edges of the two digitized surfaces (g, h); reconstructed GVG (i)