2004 Fiscal Year Final Research Report Summary
Trial manufacture of dental bonding system to achieve extremely high bond strength
| Project/Area Number |
14370641
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
補綴理工系歯学
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| Research Institution | Kagoshima University |
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Principal Investigator |
TANAKA Takuo Kagoshima University, Graduate School of Medical and Dental Sciences, Professor, 大学院・医歯学総合研究科, 教授 (40113584)
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| Co-Investigator(Kenkyū-buntansha) |
ONIZUKA Tadashi Kagoshima University, Graduate School of Medical and Dental Sciences, Associate Professor, 大学院・医歯学総合研究科, 助教授 (80038877)
KAJIHARA Hirotada Kagoshima University, University Hospital, Faculty of Medicine and Dentistry, Assistant Professor, 医学部・歯学部附属病院, 講師 (20274855)
KADOKAWA Akihiko Kagoshima University, Graduate School of Medical and Dental Sciences, Research Associate, 大学院・医歯学総合研究科, 助手 (00169533)
MINAMI Hiroyuki Kagoshima University, Graduate School of Medical and Dental Sciences, Research Associate, 大学院・医歯学総合研究科, 助手 (50244257)
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| Project Period (FY) |
2002 – 2004
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| Keywords | Dental Adhesion System / Adhesive Strength / Acrylic Resin Adhesive / Composite Resin Adhesive / Cohesive Failure / Adhesive Failure / Adhesion Durability / Adhesion Specimen |
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| Research Abstract |
Adhesive resin cement, 4-META/MMA-TBBO resin was developed 25years ago. That is the first product introduced in dental treatment. Then, many types of another adhesives were also induced in clinic. However, their adhesive bonding strength were almost same and concluded in range of 20 to 40MPa. These relatively low bond strengths restrict the treatment method. For example, adhesion fixed partial denture needs metal retainer to retain a pontic on missing tooth position. That is because a distribution occlusal stress on wider adhesion area and to reduce the stress per unit area. If the adhesive bonding strength increased to several times higher value, fixed partial denture with metal free retainer will be realized. To achieve minimum intervention in dental treatment, realization of adhesive bond system, with over 100 MPa bond strength is indispensable. To achieve an extra ordinary high bond strength adhesion system, adhesive material with extra high value of cohesive strength was developed. Composite material of 4-META and polyamides monomer was selected. As an adhered material, cobalt-chromium alloy for dental use which possesses high react ability was chosen. Special constructions method of adhesion specimen was adopted. Higher polymerization temperature of 40〜45℃ used for composite adhesive material. To reduce the void which induces the concentration of stress, 10 atm pressure was added. As a result in this study, 80MPa of adhesive bond strength was attained. However, bonding durability of this system is relatively poor and separation of adhesive occurred at the 300 times of thermo-cycling, at 4℃-60℃.
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