id	keyword
bjos-8674973	type
bjos-8674973	canal
bjos-8674973	root
bjos-8674973	premolars
bjos-8674973	number
bjos-8674973	mandibular
bjos-8674973	maxillary
bjos-8674973	symmetry
bjos-8674973	root canal
bjos-8674973	morphology
bjos-8674973	study
bjos-8674973	teeth
bjos-8674973	manuscript