歯科インプラント修復における損傷したアバットメントスクリューヘッドのモデリングプラスチック印象材を用いた保存的回収法：歯科手技

Abutment screw loosening is a common complication in single-implant restorations, and retrieval is often hindered by the risk of damaging the implant collar or by the unavailability of specialized kits. This article describes a straightforward, cost‑effective chairside technique that uses readily available modeling plastic impression compound to engage a damaged abutment-screw head and facilitate retrieval. After confirming loosening radiographically and cleaning the access, softened modeling plastic impression compound is loaded into the access hole; the hexagonal driver is coated with a separating medium and pressed into the softened material to create a hollow imprint. The driver is then reinserted to seat within the indentation, and a controlled anticlockwise rotation retrieves the damaged screw while preserving the implant's internal structure. The method can be integrated into conventional workflows and avoids reliance on expensive retrieval kits, offering a practical option when standard tools are unavailable. Limitations include dependence on the remaining screw-head geometry and lack of large‑scale validation; further clinical evaluation is recommended.