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Forming capability of advanced customized jetting additive manufacturing for restorations with different margin
Yingyue Su1, Liren Liu2, Jingxin Zhang1
1State Key Laboratory of Oral Diseases & National Clinical Research Center for Oral Diseases, West China Hospital of Stomatology, Sichuan University, Chengdu, 610041, China.
Objectives:
This study aims to investigate the forming capability of Advanced Customized Jetting (ACJ) technology for four different margin types restorations and five surface textures.
Materials And Methods:
Zirconia restorations with four margin types (heavy-chamfer, chamfer, shoulder and biologically oriented preparation technique (BOPT)) were fabricated using CAD/CAM and ACJ technology (n = 10), then compared the root mean square (RMS) at non-marginal and Marginal regions. Surface textures were designed on 5 mm×5 mm× 5 mm cubes, including 11 groups: 1 non-porous (NP) group and 10 experimental groups with circular, triangular, square, pentagram, or hexagonal textures at 400 μm (D4) or 800 μm (D8) apertures (n = 10). ACJ fabricated textured samples were analyzed via SEM and 3D profilometry and measured dimensional accuracy along X/Y/Z axes.
Results:
(1) All ACJ restorations have lower RMS values at non-marginal regions than CAD/CAM (P < 0.01). ACJ fabricated heavy-chamfer, chamfer and BOPT restorations have lower RMS values at marginal region than CAD/CAM (P < 0.01), whereas no difference in shoulder (P > 0.05). (2) Circle and hexagon have the highest accuracy: D4C (90.58%), D8C (94.96%), D4H (87.29%) and D8H (92.96%), while pentagram has the lowest accuracy (D8P: 71.37%). The dimensional deviations of Z-axis are within 10 μm, and the accuracy of printing are above 90%.
Conclusions:
ACJ restorations exhibited lower RMS values than CAD/CAM in both non-marginal region and marginal region with heavy-chamfer, chamfer, and BOPT margins. Circle textures have the highest accuracy and larger aperture improves printing accuracy.
Clinical Relevance:
ACJ fabricated zirconia restorations exhibit higher geometric precision and demonstrate technical feasibility in manufacturing customized morphological features.
