要旨：同じ上顎欠損患者において2つの口腔内スキャナーを使用した際のデジタル印象採得を比較すること．
材料と方法：6人の上顎欠損患者の上顎をTRIOS3とTrophy 3DI PROの二つのスキャナーを用いてスキャンした．得られた3Dデータの面積を，3D分析ソフトウェアを使用して計算し，スキャナー間での差を調べた．
結果：残存歯についてはほとんどの症例でスキャンできたが，上顎欠損部分や軟組織部分の全てをスキャンすることはできなかった．得られた3Dデータの面積は，スキャナー間で有意差があった（p＜0.05）．
結論：上顎欠損患者において二つの口腔内スキャナーによるスキャンを試みたところ，全ての症例において，Trophy 3DI PROよりTRIOS3のほうがスキャン領域が広かった．しかしどちらも上顎の3Dデータを完全に得ることはできなかった．

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A patient underwent closure surgery for perforation of the nasal dorsum due to diphtheria in early childhood, and then a femoral flap transplantation had been performed at the same site 40 years ago. Her external nose remained, but was depressed due to a defect in the nasal septum. The nasal cavity and oral vestibule were connected. Previously, the patient’s self-made appliance was used to maintain the height of the nasal dorsum.
Therefore, we made two obturator prostheses using two different materials, a denture base resin and a silicone relining material. After using the silicone obturator prosthesis for 2 months, a questionnaire was carried out. The questionnaire included 11 questions classified into material, feeling, maintenance, esthetics, and overall evaluation. After using the silicone obturator prosthesis for 1 year and 6 months, the color difference, hardness, and surface roughness of the silicone relining material were evaluated. Both types of nasal prostheses maintained the height of the nasal dorsum, and improved esthetics and functionality.
The hardness of the material of a prosthesis used in the nasal cavity is important; the softness of silicone relining material improves its stability and comfort. The silicone relining material maintained sufficient elasticity and color tone during long-term use.

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