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a An intraoral periapical radiograph of a 12-year-old girl showing a wide-open apex of #45 with thin lateral dentinal walls and apical radiolucency. b Three-month follow-up periapical radiograph of tooth #45 after undergoing conventional RET. c Six-month follow-up radiograph. d Nine-month follow-up radiograph. e Twelve-month follow-up radiograph showing apical radiolucency resolution, apex closure, root elongation and lateral dentinal wall thickening
