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Table 7 Comparison of mean RID change according to Pederson’s difficulty index (DI)

From: Spontaneous bone regeneration after surgical extraction of a horizontally impacted mandibular third molar: a retrospective panoramic radiograph analysis

DI

Assessment

RID6W_RID0

RID6M_RID6W

RID6M_RID0

5 (n = 5)

− 3.20 ± 1.64a

− 2.63 ± 1.44b

− 5.83 ± 1.68b

6 (n = 11)

− 2.56 ± 2.11a

− 2.91 ± 2.24b

− 5.47 ± 2.43b

7 (n = 10)

− 2.07 ± 1.09a

− 4.08 ± 2.45b

− 6.15 ± 2.21b

8 (n = 8)

− 5.37 ± 2.80a

− 2.86 ± 1.86b

− 8.22 ± 1.63b

p value

0.010

0.488

0.053

  1. Abbreviations: RID6W_RID0 difference between the radiographic infrabony defect recorded at 6 months and at baseline, RID6M_RID6W difference between the radiographic infrabony defect recorded at 6 months and at 6 weeks, RID6M_RID0 difference between the radiographic infrabony defect recorded at 6 months and at baseline
  2. a)Statistically significant decrease in mean RID6W compared with baseline (RID0) according to Pederson’s difficulty index (DI) (p < 0.05) by one-way ANOVA
  3. b)No statistically significant decrease in mean RID change according to DI (p > 0.05) by one-way ANOVA