Establishment of optimal prostheses design and manufacturing parameters in next-generation CAD/CAM systems

2022 Fiscal Year Final Research Report

• Project/Area Number: 20K10043
• 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: Tsurumi University
• Principal Investigator: Hirai Shinya 鶴見大学, 歯学部, 助教 (20339815)
• Co-Investigator(Kenkyū-buntansha): 小川 匠 鶴見大学, 歯学部, 教授 (20267537) ; 木原 琢也 鶴見大学, 歯学部, 学部助手 (50796399) ; 井川 知子 鶴見大学, 歯学部, 助教 (70552389)
• Project Period (FY): 2020-04-01 – 2023-03-31
• Keywords: CAD/CAM / 咬合高さ / スキャン / 切削加工 / 精度

Outline of Final Research Achievements

The purpose of this study was to measure the occlusal height of prostheses fabricated by CAD/CAM systems and to establish optimal design and manufacturing parameters. Complete metal crowns and CAD/CAM crowns were fabricated using dental models, and the occlusal heights were measured using a high-accuracy height measuring articulator. As a Result, the occlusal height of CAD/CAM crowns was higher on average than the complete metal crowns. The standard deviation differed depending on the material shape such as disk and block, It was suggested that the milling position affected the repeatability of CAD/CAM crown fabrication. The effect of milling machine type was also examined. It was indicated that the performance of different milling machines may affect the occlusal height.

Free Research Field

補綴歯科

Academic Significance and Societal Importance of the Research Achievements

歯科治療においてCAD/CAMは補綴装置製作の手段のひとつとなっているが，そのプロセスであるスキャンや加工等はメーカーから公開されている情報も少なく，未だブラックボックスであり製作精度が曖昧となっている．本研究の成果により，CAD/CAMシステムによって製作された補綴装置の咬合の高さが明らかとなり，製作過程であるスキャンや設計，加工による影響が工程ごとに数値化することができた．客観的指標を持ってCAD/CAMシステムの設計製造パラメータを制御し，精度の高い補綴装置を製作することの一助になる可能性が示唆された．