2006 Fiscal Year Final Research Report Summary
Cementum crack formation by repeated loading in vitro
| Project/Area Number |
16592076
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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 |
Periodontal dentistry
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| Research Institution | Kyushu Dental College |
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Principal Investigator |
YOKOTA Makoto Kyushu Dental College, Department of Dentistry, Professor, 歯学部, 教授 (40107298)
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| Co-Investigator(Kenkyū-buntansha) |
HAGA Kensuke Kyushu Dental College, Department of Dentistiy, Lecturer, 歯学部, 講師 (80014380)
KUBOTA Kozo Kyushu Dental College, Department of Dentistiy, Assistant professor, 歯学部, 助手 (60161676)
NAITO Toru Fukuoka Dentalcollege, Department of Dentistry, Lecturer, 歯学部, 講師 (10244782)
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| Project Period (FY) |
2004 – 2006
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| Keywords | traumatic occlusion / DCS / abfraction / DCS |
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| Research Abstract |
Background: The purpose of this study is to clarify whether or not cemental fatigue destruction occurs when repeated stresses are loaded on the occlusal surface of a tooth.
Methods: The compressive load of 5.0kgf was repeatedly applied to the tooth soaked in water 1 million times. Cracks were dyed with 2% methylene blue solution and crack areas were measured using photographs gray-scaled and binary-processed on Photoshop. Data were analyzed using image analysis software Pixs2000pro..
Results: 1) The cracks significantly developed on the buccal, mesial and distal surfaces but not on the lingual surface; 2) crack areas showed a tendency to significantly increase after 500,000 loadings; 3) extension of the crack from the CEJ to the root apex increased with time, and the average extension was 0.67± 0.12 mm after 1 million loadings.
Conclusion: This study suggested that occlusion or bruxism may trigger the development of site-specific attachment loss, which is one of the potential factors inducing periodontal diseases.
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