| Project/Area Number |
16591918
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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 | Nagasaki University |
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Principal Investigator |
KUBO Shisei Nagasaki University, Hospital of Medicine and Dentistry, Associate Professor, 医学部・歯学部附属病院, 助教授 (80145268)
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| Co-Investigator(Kenkyū-buntansha) |
YOKOTA Hiroaki Nagasaki University, Graduate School of Biomedical Sciences, Instructor, 大学院医歯薬学総合研究科, 助手 (90301366)
KAWASAKI Koji Nagasaki University, Hospital of Medicine and Dentistry, Associate Professor, 医学部・歯学部附属病院, 助教授 (60161303)
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| Project Period (FY) |
2004 – 2006
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| Project Status |
Completed (Fiscal Year 2006)
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| Budget Amount *help |
¥3,600,000 (Direct Cost: ¥3,600,000)
Fiscal Year 2006: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 2005: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 2004: ¥2,600,000 (Direct Cost: ¥2,600,000)
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| Keywords | EBM / Non-carious cervical lesions / Root caries / Clinical trial / Progress speed of lesions / Microleakage / Cohort study / One-step self-etch systems |
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| Research Abstract |
(1) The latest one-step self-etch systems showed significant higher bond strengths than earlier one-step systems. However, even the latest systems could not eliminate technique sensitivity.
(2) Class 5 resin composites restored with two-step self-etch (Liner Bond 2) and two-step total-etch (Single Bond) systems have demonstrated excellent clinical performances for 9 years.
(3) Although marginal discoloration occurred earlier compared to the two-step systems, class 5 resin composite restored with the latest one-step self etch systems (S^3 Bond and G-Bond) have shown acceptable clinical performances for 18 months.
(4) There were no significant difference in clinical performances between types of resin composite (hybrid : Clearfil AP-X ; flowable Clearfil Flow FX).
(5) Significant difference in 10-year survival rates of class 5 resin composites was found between operators (principal investigator:86%, other dentists:54%).
(6) Loss of restorations was the main reason for failures of class 5 resin composites. From the viewpoint of tooth types, however, their main reasons were different: secondary caries for anterior teeth and loss for posterior teeth.
(7) Mean progress rate of non-carious cervical lesions was approximately 70 μm per year.
(8) Caries at cervical regions has been arrested for 5.8 years if it was in non-active stage.
(9) A questionnaire study on decision-making for retreatment of resin composites revealed that there were great variances in criteria among dentists in some cases.
(10) Long-term clinical observation suggested that monitoring of restorations could provide more accurate diagnosis and proper decision-making.
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