Statistical analysis
SAFH, IAFH
SPSS software (version 26; IBM Corp., Armonk, NY, USA) was used for statistical analysis.Kolmogorov–Smirnov tests (K-S test) were used to check if the results of the coronal and apical linear distance and the angular deviations of each group were in accordance with normal distribution.Paired-samples T tests (in accordance with normal distribution) or Wilcoxon tests (not in accordance with normal distribution) were used to analyze the differences in the coronal and apical linear distance and the angular deviations between two surgery approaches (Group SG vs. FH) within the same practitioner group, i.e., Group SASG vs. SAFH, Group SBSG vs. SBFH, Group SSG vs. SFH, Group IASG vs. IAFH, Group IBSG vs. IBFH and Group ISG vs. IFH, respectively.Independent-samples T tests (in accordance with normal distribution) or Mann–Whitney U-tests (not in accordance with normal distribution) were used to analyze the differences in the coronal and apical linear distance and the angular deviations between two learning sequences (Group A vs. B) and two groups of practitioners’ experience (Group S vs. I) with the same surgery approach, i.e., Group SASG vs. SBSG, Group SAFH vs. SBFH, Group IASG vs. IBSG, Group IAFH vs. IBFH, Group SSG vs. ISG, and Group SFH vs. IFH, respectively.Descriptive analyses were performed for all variables.