Strategic research on the development of high-precision scanning assist devices for digital impression methods

2023 Fiscal Year Final Research Report

• Project/Area Number: 20K18644
• Research Category: Grant-in-Aid for Early-Career Scientists
• Allocation Type: Multi-year Fund
• Review Section: Basic Section 57050:Prosthodontics-related
• Research Institution: Showa University
• Principal Investigator: MIyoshi Keita 昭和大学, 歯学部, 兼任講師 (30845128)
• Project Period (FY): 2020-04-01 – 2024-03-31
• Keywords: デジタル印象 / 精度 / インプラント / 補助デバイス

Outline of Final Research Achievements

Due to the characteristics of intraoral scanners, it has been reported that accuracy decreases as the impression range increases, and the conventional method is currently recommended for a wide range of prosthetic devices. Therefore, the purpose of this study is to develop an auxiliary device to improve the accuracy of the digital impression method and to establish an optimal scanning method using this device in order to ensure the accuracy of the digital impression method using an intraoral scanner for whole jaw scanning. We developed an auxiliary device according to the plan and verified that the accuracy of the digital impression method was improved on a model, and the improvement was recognized.

Free Research Field

補綴歯科

Academic Significance and Societal Importance of the Research Achievements

クラウン・ブリッジやインプラント上部構造などの補綴装置の製作方法は，印象材，石膏模型および歯科用合金に立脚した間接法から，口腔内スキャナーによるデジタル印象およびジルコニア等のセラミック材料を用いたフルデジタルワークフローに取って代わりつつある.それにより，従来法を基盤とした煩雑な製作過程が合理化された．また口腔内スキャナーを用いたデジタル印象法で口腔内を直接スキャンして三次元形態データを取得することにより，理論上は印象材の重合収縮，模型材に用いられる石膏の硬化膨張などの材料特有の寸法変化や，スティッチングに起因する寸法精度の低下などが解消されれ，より精度の高い補綴物の作成が可能となる．