An eight-year-old male came to the Department of Pediatric Dentistry at the Lebanese University for a general check-up. The patient's medical history was noncontributory. Extraoral examination revealed no significant findings. Intraoral examination showed that he had a mixed dentition. The permanent maxillary first molars (PMFMs) were impacted and showed plaque accumulation. The patient's oral hygiene was good and no caries were detected (). Two bitewings confirmed the absence of interproximal caries. Dental panoramic tomography revealed that two-thirds of the PMFMs’ roots were complete (). Moreover, they were obstructed by the distal bulge of the right primary maxillary second molars (55) and the left one (65) causing a premature resorption on their distal roots (). Despite severe resorption, teeth 55 and 65 showed no significant mobility. A modified Croll's appliance was chosen to distalize the PMFMs. It is a fixed appliance with bilateral distal extensions (2–3 mm distal of the right PMFM (16) and the left one (26)). A 0.036″ orthodontic wire was used to fabricate both extensions with small hooks on their distal aspect. A transpalatal bar with an acrylic button is incorporated. Bands are cemented on the first primary molars, while bondable buttons are placed on the mesio-occlusal aspect of teeth 16 and 26. In order to provide distal pressure on both permanent molars, chain elastics are adapted on both buttons and placed over the hooks on the distal aspect of both extensions (). The activation of the appliance was done every two weeks by shortening the elastic chain. Six weeks later, clinical and radiographic exams revealed that the first molars displayed a favorable position and proper angulation relative to the occlusal plane (). After the correction of EE of PMFMs and the removal of the appliance, the patient was scheduled for follow-up appointments every six months as he was transitioned to a full permanent dentition.