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This article reports an innovative technique in the treatment of a central incisor with a wide open apex and parallel dentinal walls. Root canal treatment was initiated, and calcium hydroxide intracanal medicament was placed in the canal for a month. The intracanal medicament was removed by instrumentation and irrigation with 3% sodium hypochlorite and 17% ethylenediaminetetraacetic acid. A light body impression of the root canal space was made and replicated the three-dimensional root canal space in a putty impression. Mineral trioxide aggregate (MTA) was condensed into the impression and allowed to set for 24 h in the presence of moisture to obtain a BioRoot inlay. This BioRoot inlay was cemented into the canal. Follow-up of every 6 months for 4 years revealed clinically asymptomatic and satisfactory healing of periapical lesion.