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A male patient aged 11 years presented a large dentigerous cyst in the lower left quadrant associated with retained deciduous lower lateral incisor and canine and impacted, unerupted corresponding permanent ones. The treatment consisted in marsupialisation and placement of a modified lingual arch that held a tube for decompression used for irrigation of the cystic cavity in a comfortable way for the patient and for the clinician. The same lingual arch was later used as an anchorage method for retained teeth traction. The final records showed complete resolution of the cyst and retained teeth were successfully placed in their correct position in the oral cavity.