Establishment of manufacturing method for clinical application of zirconia crowns by additional manufacturing method

2023 Fiscal Year Final Research Report

• Project/Area Number: 21K10026
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Review Section: Basic Section 57050:Prosthodontics-related
• Research Institution: Meikai University
• Principal Investigator: Miura Shoko 明海大学, 歯学部, 准教授 (60431590)
• Co-Investigator(Kenkyū-buntansha): 藤澤 政紀 明海大学, 歯学部, 教授 (00209040)
• Project Period (FY): 2021-04-01 – 2024-03-31
• Keywords: 付加製造 / 3Dプリンタ / 液槽光重合法 / ジルコニア

Outline of Final Research Achievements

The purpose of this study was to investigate the effects of the direction of fabrication and low temperature degradation (LTD) of additionally fabricated zirconia specimens on the mechanical properties of additionally fabricated zirconia. The mechanical properties were flexural strength, modulus of elasticity, Vickers hardness, and fracture toughness. Zirconia specimens were prepared with a stereolithography apparatus. The specimens were positioned parallel (0°), oblique (45°), and perpendicular (90°) to the building direction, and the LTD conditions were 134°C for 5 hours in a 0.2 MPa autoclave. The results showed that the 0° direction differed significantly from all other conditions before and after aging, and that the highest flexural strength was obtained when the specimens were manufactured perpendicular to the modeling direction.

Free Research Field

クラウンブリッジ補綴学

Academic Significance and Societal Importance of the Research Achievements

最も高い曲げ強さが得られたのは，造形方向が製作方向に対して垂直な場合であった．破壊靭性，弾性率，ポアソン比，および化学組成は影響を受けなかった．ミクロ組織を観察した結果，層，大きな結晶，空隙は，製造方向と平行な方向でより顕著に観察された．一方で，LTDは曲げ強さ，弾性率，ビッカース硬さ，破壊靭性にはほとんど影響しなかった．これらの機械的特性は，造形方向だけでなく，AM法の違いによっても影響を受ける可能性がある．また，洗浄，脱脂，焼結，および色浸漬を含むすべての処理工程の最適化は，臨床応用のための3Dプリンティングジルコニア材料の最適な信頼性を達成するために必要である．