a decreasing trendp = 0.03
Regarding the assessed horizontal subocclusal ( so ), central ( c ), and apical ( a ) levels, nerve fiber density showed a decreasing trend from subocclusal to apical in AG 1 and AG 2 in incisors as well as in cheek teeth (cheek teeth: AG 2: so vs. a : p = 0.03; see Table S2.1 ).