A study on abutment construction for the zirconia bridge in consideration of the protection of the root and periodontal tissue

2014 Fiscal Year Final Research Report

• Project/Area Number: 24792061
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Prosthetic dentistry
• Research Institution: Tokyo Medical and Dental University
• Principal Investigator: KOMADA Wataru 東京医科歯科大学, 歯学部附属病院, 講師 (10447493)
• Project Period (FY): 2012-04-01 – 2015-03-31
• Keywords: 支台築造 / グラスファイバーポスト / ジルコニア / ひずみゲージ / 冠橋義歯

Outline of Final Research Achievements

The purpose of this study was to evaluate the surface strain of zirconia fixed partial denture frameworks and their abutment roots when restored with two types of post and core materials. Artificial mandibular first premolars and second molars were used as the abutment teeth. Posts and cores were of two types: resin composite with glass fiber posts (RC) and cast platinum gold alloy (MC). The cores and 4-unit zirconia frameworks were bonded to the specimens. Static loading was applied to the occlusal surfaces, and the surface strain of the frameworks and roots (distal premolar and mesial molar) was measured by strain gauge method. Premolar root showed a significantly higher magnitude of principal strain than molar root. RC showed a significantly higher magnitude of principal strain than MC. The results suggest that MC restrain the surface strain compared to RC when the missing teeth are replaced by a 4-unit zirconia framework.

Free Research Field

補綴系歯学