[Retracted] Dosimetric Comparison between Volumetric Modulated Arc Therapy (VMAT) and Intensity-Modulated Radiotherapy (IMRT) for Dental Structures of Head and Neck Cancer Patients

Table 6

Mean of the average and the maximum dosages delivered to dental structures by IMRT and VMAT according to whether PTV included level Ib or not.

		IMRT		VMAT
		Mean (median) average	Mean (median) maximum	Mean (median) average	Mean (median) maximum
Anterior teeth	Include level Ib	30.50 ± 14.56^a	41.22 ± 16.05^a	34.87 ± 17.80^a	42.04 ± 19.21^a
	Exclude level Ib	21.45 ± 7.89^b	30.48 ± 10.34^b	26.13 ± 8.55^b	31.85 ± 11.84^b
Premolars	Include level Ib	36.93 ± 14.26^a	46.20 ± 14.55^a	38.33 ± 16.27^a	47.90 ± 16.60^a
	Exclude level Ib	28.02 ± 9.66^b	35.50 ± 9.12^b	29.42 ± 10.05^b	36.30 ± 12.11^b
Molars	Include level Ib	42.27 ± 12.18^a	58.73 ± 11.14^a	44.80 ± 12.71^a	60.32 ± 11.29^a
	Exclude level Ib	35.72 ± 9.09^b	49.94 ± 11.36^b	36.57 ± 9.99^b	51.01 ± 12.28^b

Different lowercase letters in the columns represent significant differences () (independent-samples t-test). In each column, we compared the inclusion and exclusion of level Ib in the same tooth type.