3Dプリンターで作成された歯科鋳造パターンの寸法精度

Dimensional accuracy of dental casting patterns created by 3D printers.

抄録

切開CAD/CAMの普及に反して、3Dプリンターの歯科応用、特に有機材料での3Dプリンター利用の可能性についてはほとんど知られていない。熱溶融装置（CX），デジタル光造形装置（B9），レーザー光造形装置（DW），マルチジェットモデリング装置（PJ）の4種類の3Dプリンターを用いて，全歯冠模型のレジンパターンを作製した．作製した歯冠模型の外径，内径，深さの寸法精度，側壁の表面粗さについて検討した．外径はほとんどの条件で設計値より小さかった。内径は，B9を除くすべての拡大率で設計値より小さかった．CX，B9の深さは浅くなる傾向にあったが，PJ，DWの深さは大きくなる傾向にあった．歯軸方向の表面粗さは歯軸直角方向の表面粗さよりも大きかった．

Contrary to widespread incise CAD/CAM, little is known about the dental application of 3D printing, especially the possibility of using 3D printing with organic material. The resin patterns of a full crown model were created by four types of 3D printers, a thermofusion device (CX), a digital light processing stereo-lithograph device (B9), a laser stereo-lithograph device (DW) and a multi-jet modeling device (PJ). The dimensional accuracy of the outer and inner diameters and depths of the created model crowns, and the surface roughness of sidewall were investigated. The outer diameters were smaller than the designed value in most conditions. The inner diameters were smaller than the designed value in any enlargement ratio except B9. The depth of CX or B9 tended to become shallower, though that of PJ or DW tended to increase. The surface roughness along the tooth axis direction was greater than that perpendicular to the tooth axis.