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2001 Fiscal Year Final Research Report Summary

Effect of Rheological Properties of Resin Composite Pastes on Marginal Adaptation of the Restoration in Dentin Cavity

Research Project

Project/Area Number 11671903
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Conservative dentistry
Research InstitutionShowa University

Principal Investigator

HASEGAWA Tokuji  Showa University School of Dentistry, Assistant Professor, 歯学部, 講師 (10180861)

Project Period (FY) 1999 – 2001
Keywordsresin composite / dentin bonding / contraction stress / marginal adaptation / contraction gap / rheological propertiy
Research Abstract

Marginal adaptation of eight commercially available resin composites, Clearfil APX, Estelite, Estio LC, Litefil IIA, Prodigy, Progress, Silux Plus and Z-100, were detemiined by measurement of the contraction gap width in a cylindrical dentin cavity. The cavity walls were treated with the experimental dentin bonding system consisting of 05M EDTA, 35% glyceryl mono-methacrylate solution and Clearfil Photo Bond. Three composites, Clearfil APX, Estelite and Silux Plus, prevented the contraction gap formation completely. There was not significantly deference (p>0.O5) between the gap width and tensile bond strength to flat dentin surface of the eight composites.
The thixoiropy indexes [TI] of the eight composite pastes depending on a lime were detemiined by a cone and plate viscometry sensor system mounted in a Viscotester VT550.The composite pastes were stored, in 24+1C at least for 24 hours, and then transferred on the thermostatic plate senser at 37+1C. The TI at 10.68 s-1 of a shear rate correlated significantly (r2=0.822) with the measured gap width. Furthermore the yield strengths and thixotropy depending on a rotalive velocity of the eight composites were measured by a truncated cone and plate viscometry senser system mounted in a Rheosiress RS75.Condition of the composite pastes and plate senser were controlled as same as measuring of the TI. The TI of the eight composites correlated significantly (r2=0.757) with the measured gap width. The rheological properties of the composite pastes may predict the marginal adaptation of the polymerized composites in dentin cavity.

  • Research Products

    (2 results)

All Other

All Publications (2 results)

  • [Publications] Hasegawa T, et al.: "Effect of mechanical propeities of resin composites on the efficacy of the dentin bonding system"Operative Dentistry. 24. 323-330 (1999)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Hasegawa T, Itoh K, Koike T, Yukitani W, Hisamitsu H, Wakumoto S, Fujishima A.: "Effect of mechanical properties of resin composites on the efficacy of the dentin bonding system."Operative Dentistry. 24. 323-330 (1999)

    • Description
      「研究成果報告書概要(欧文)」より

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Published: 2003-09-17  

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