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. Author manuscript; available in PMC: 2019 Jun 1.
Published in final edited form as: J Prosthet Dent. 2017 Nov 29;119(6):928–934. doi: 10.1016/j.prosdent.2017.09.013

Figure 3.

Figure 3.

NFE values acquired over 7 years for present in vivo study. Dashed lines indicate cutoff points of 4 pathological classifications identified in earlier work (see Fig. 1).1 Ultimately, 6 of 9 high-risk sites improved to NFE value below 0.03 (mild/none). Two sites, B12 and H14, continued to exhibit NFE>0.04, indicating continuing nonlinear deterioration. Site B14 exhibited positive/negative volatility. NFE, normal fit error; QPD, quantitative percussion diagnostics.