Investigation of the non-metal clasp denture based on the load exerted on the abutment tooth and beneath the denture base

2014 Fiscal Year Final Research Report

• Project/Area Number: 24592899
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Prosthetic dentistry
• Research Institution: Tohoku University
• Principal Investigator: YODA Nobuhiro 東北大学, 歯学研究科(研究院), 助教 (20451601)
• Co-Investigator(Kenkyū-buntansha): SASAKI Keiichi 東北大学, 歯学研究科(研究院), 教授 (30178644) ; HAMADA Taizou 東北大学, 歯学研究科(研究院), 客員教授 (50034244) ; TAKAHASHI Masatoshi 東北大学, 歯学研究科(研究院), 助教 (50400255) ; KAWATA Tetsuo 東北大学, 歯学研究科(研究院), 大学院非常勤講師 (80292225)
• Project Period (FY): 2012-04-01 – 2015-03-31
• Keywords: ノンメタルクラスプデンチャー / 維持力 / レジンクラスプ / 支台歯荷重

Outline of Final Research Achievements

Non-metal clasp denture (NMCD) has recently been applied widely as a prosthodontic option. This study aimed to evaluate the retentive forces of NMCDs.
Four kinds of NMCDs; polyamide-nylon resin non-metal clasp denture (PA-NMCD), polycarbonate resin non-metal clasp denture (PC-NMCD), polycarbonate resin non-metal clasp denture with a metal frame (mPC-NMCD), and acrylic resin denture (PMMA-CD), were fabricated. Load exerted on a direct abutment tooth during pulling off the denture vertically from the model were measured using a piezo-electric transducer. The mesio-lateral component of the load on the abutment tooth by mPC-NMCD and by PMMA-CD was significantly larger than that by PA-NMCD and by PC-NMCD. The vertical component of the load, i.e. the retentive force of the thermoplastic resin clasp, by PMMA-CD was significantly largest. It was suggested that the NMCD could not exert adequate retentive force as same as the conventional metal clasp when 0.25 mm of under-cut was applied.

Free Research Field

補綴理工系歯学