Permanent tooth eruption occasionally fails due to local, systemic or idiopathic reasons. Full retardation of eruption is a very rare clinical finding and is challenging in terms of aetiology. This case report describes the clinical condition of a 13-year-old boy, where primary teeth were still present in the oral cavity. Surgical exposure was performed and the patient was followed up for 8 years, showing partial eruption of some teeth at a slow rate. The working diagnosis based on clinical and radiographical criteria is ?idiopathic loss of eruption potential?. Treatment plan is also discussed in this report.
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