| Project/Area Number |
17592004
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Conservative dentistry
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| Research Institution | Nihon University |
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Principal Investigator |
MASASHI Miyazaki Nihon University, School of Dentistry, Professor (70239391)
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| Co-Investigator(Kenkyū-buntansha) |
ANDO Susumu Nihon University, School of Dentistty, Assistant Professor (40120365)
RIKUTA Akitomo Nihon University, School of Dentistiy, Assistant Professor (40287660)
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| Project Period (FY) |
2005 – 2007
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| Project Status |
Completed (Fiscal Year 2007)
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| Budget Amount *help |
¥3,560,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2007: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2006: ¥1,100,000 (Direct Cost: ¥1,100,000)
Fiscal Year 2005: ¥900,000 (Direct Cost: ¥900,000)
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| Keywords | Dentin / Resin / Bonding / Interface / Durability / Demineralization / Ultrasound |
|---|
| Research Abstract |
The evaluation of bonding durability is important, as the bond between the restorative material and the tooth substrate has a significant impact on the clinical success of tooth-colored restorations. Although the most reliable conclusions about the performance of dental adhesive systems in the oral environment are derived from long-term clinical trials, the long-term storage of a bonded specimen in water or subjecting it to thermal cycling can give some insight into the temperature-dependent degradation of the material. Knowledge about the mechanical properties of tooth substrate and restorative materials could help with understanding and improving adhesive systems. The question has been arisen whether the mechanical properties of the components of resin-dentin bonding interface might be adversely affected by the thermal stress after the restoration. Since the mechanical properties of each resin-dentin bond component are expected to play important roles in bonding properties, the bondi
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ng durability might depend on the stability of the components. The purpose of this study was to determine the elastic modulus of the components at a resin-dentin interface. The longitudinal and shear wave sound velocities and elastic modulus were determined using ultrasonic equipment composed of a pulserreceiver, transducers and an oscilloscope. The round-trip transit time through an area of known thickness was measured with both longitudinal and shear wave transducers as the differential time between the echoes. The dentin bonding system aims to obtain a strong and durable bond with no microleakage. Many systems have been developed and new approaches ensure the creation of stable bonds at a rapid rate. The primary bonding mechanism of the current adhesive system is believed to form at the resin-dentin interdiffusion zone after acid-etching of the dentin. This interface is comprised of several layers of materials with differing mechanical properties that together determine the final bond strength of the adhesive system. Less
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