RT Journal Article SR Electronic T1 Overcoming the failure of anesthesia in the mandibular teeth JF Saudi Medical Journal JO Saudi Med J FD Prince Sultan Military Medical City SP 425 OP 425 DO 10.15537/smj.2019.5.24078 VO 40 IS 5 A1 Gazal, Giath YR 2019 UL http://smj.org.sa/content/40/5/425.abstract AB