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Table 4 Radiation doses delivered to lower (maxillary) and upper (mandibular) teeth using 3DRT and IMRT according to the primary site of the tumor

From: IMRT delivers lower radiation doses to dental structures than 3DRT in head and neck cancer patients

  Oral cavity Tongue Oropharynx Nasopharynx
Mean average Mean maximum Mean average Mean maximum Mean average Mean maximum Mean average Mean maximum
3DRT Maxilla 43.38 (±27.27)aA 48,17 (±27.24)aA 25,31 (±24.36)aB 30,26 (±24.81)aB 37,75 (±27.36)aAB 44,85 (±27.28)aA 34,83 (±17.21)aAB 45,28 (±17.02)aAB
Mandible 43.41 (±26.01)aA 50,86 (±28.29)aA 47,64 (±21.66)bA 53,51 (±19.59)bA 36,99 (±28.47)aA 43,47 (±29.08)aA 40,13 (±16.85)aA 48,66 (±15.95)aA
IMRT Maxilla 29.58 (±15.02)aA 39.76 (±17.58)aA 35.63 (±19.88)aA 44.07 (±21.33)aA 29.93 (±16.06)aA 38.04 (±19.77)aA 31.75 (±8.99)aA 41.38 (±12.24)aA
Mandible 37.31 (±16.93)bAB 45.23 (±18.35)aAB 42.93 (±15.20)aAB 52.37 (±15.99)aAB 33.92 (±17.44)aA 41.28 (±19.51)aA 31.62 (±9.56)aA 42.74 (±13.69)aA
  1. Different lower case letters in columns mean statistically significant difference (p < 0.05) (t-test). In columns, compare 3DRT groups themselves and IMRT groups themselves
  2. Different upper case letters in rows mean statistically significant difference (p < 0.05) (One way ANOVA test + Tukey’s post-hoc test). In rows, compare mean of the averages themselves and mean of the maximums themselves