Development of novel non-metal restorations for primary teeth by using vat photopolymerization.

2023 Fiscal Year Final Research Report

• Project/Area Number: 21K17191
• Research Category: Grant-in-Aid for Early-Career Scientists
• Allocation Type: Multi-year Fund
• Review Section: Basic Section 57070:Developmental dentistry-related
• Research Institution: Nihon University
• Principal Investigator: IWASAKI Taro 日本大学, 歯学部, 助教 (60778281)
• Project Period (FY): 2021-04-01 – 2024-03-31
• Keywords: 光造形法 / CAD/CAM / 歯科材料 / 補綴装置 / 機械的性質 / 適合

Outline of Final Research Achievements

Additive manufacturing technology as new applications for the dental fields has expanded rapidly in recent years. The purpose of this research was to investigate the effects of printing parameters, including layer thicknesses and printing orientations, on the mechanical properties of vat photopolymerization-based additively manufactured parts by hardness tests using a dynamic ultra-micro hardness tester, and three-point bending test using a universal testing machine. In addition, the effects of these parameters （layer thicknesses and printing orientations） on the accuracy of the parts were examined. The results showed that printing parameters affected the dynamic hardness, indentation elastic modulus, flexural strength, and flexural modulus. The layer thicknesses affected the shrinkage and expansion of the 3D printed cubic parts. Moreover, differences in layer thickness affected the morphology of the 3D printed abutment teeth, especially in the finish line.

Free Research Field

歯科補綴学

Academic Significance and Societal Importance of the Research Achievements

本研究は、液槽光重合法における造形条件（積層ピッチや積層方向）が造形物の機械的性質や寸法精度に及ぼす影響について評価、検討を行った。その結果、液槽光重合法ではその用途に応じて積層ピッチや積層方向の最適な設定が必要であること、また、寸法誤差は造形条件や造形部位に影響を受けることが明らかとなった。これらの知見は、デジタル技術を応用した新規補綴装置開発の一助となると考えられる。