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Study on Polymerization Contraction Stress of Bulk-fill Resin Composites
https://osaka-dent.repo.nii.ac.jp/records/286
https://osaka-dent.repo.nii.ac.jp/records/286bc928a4b-f0ff-46bd-afb3-70efae430340
| 名前 / ファイル | ライセンス | アクション |
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学位論文 (2.0 MB)
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論文内容要旨・審査結果要旨 (212.6 kB)
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| Item type | 学位論文 / Thesis or Dissertation(1) | |||||||||||
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| 公開日 | 2021-04-23 | |||||||||||
| 本文言語 | ||||||||||||
| 言語 | eng | |||||||||||
| タイトル | ||||||||||||
| タイトル | Study on Polymerization Contraction Stress of Bulk-fill Resin Composites | |||||||||||
| 著者 |
岩﨑, 和恵
× 岩﨑, 和恵
× Iwasaki, Kazue
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| キーワード | ||||||||||||
| 主題Scheme | Other | |||||||||||
| 主題 | bulk-fill composite resin | |||||||||||
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| 主題Scheme | Other | |||||||||||
| 主題 | polycrystallized glass block | |||||||||||
| キーワード | ||||||||||||
| 主題Scheme | Other | |||||||||||
| 主題 | polymerization contraction stress | |||||||||||
| キーワード | ||||||||||||
| 主題Scheme | Other | |||||||||||
| 主題 | C-factor | |||||||||||
| 資源タイプ | ||||||||||||
| 資源タイプ識別子 | http://purl.org/coar/resource_type/c_db06 | |||||||||||
| 資源タイプ | doctoral thesis | |||||||||||
| アクセス権 | ||||||||||||
| アクセス権 | open access | |||||||||||
| アクセス権URI | http://purl.org/coar/access_right/c_abf2 | |||||||||||
| 抄録 | ||||||||||||
| 内容記述タイプ | Abstract | |||||||||||
| 内容記述 | Purpose: While incremental filling is recommended for deep cavities when a light-cured composite resin (CR) is used, because of issues such as polymerization contraction stress and irradiation depth, bulk-fill CRs, which can be filled in large cavities at once, have been developed and used in clinical application. This study examined the effects of the polymerization contraction stress of bulk-fill CRs in high C-factor cavities by conducting visual evaluation using polycrystallized glass blocks, shear bond strength tests on bovine dentin, and measurement of the residual volume after curing. Materials and methods: Bulk Base Hard (BH) and Beautifil Bulk Flow (BF) were used as bulk-fill CRs, and Gracefil Flow (GF) as a conventional CR. As bonding systems, Clearfil Mega Bond2 (MB) and Clearfil Universal Bond Quick ER (ER) were used. Bioram-M was used as the polycrystallized glass block. The groups filled with each CR after bonding treatment with MB were designated as the MBH Group, MBF Group, and MGF Group, and the groups filled with each CR after bonding treatment with ER as the EBH Group, EBF Group, and EGF Group. A cylindrical cavity of 4.5 mm diameter and 4.0 mm depth in Bioram-M was formed, the cavity was repaired, and the state of gap and crack generation was classified and scored. Furthermore, a flat dentin surface on a bovine front tooth was prepared, repaired, and then the tensile-shearing strength was measured immediately after bonding. A rubber ring jig with 4.5 mm diameter and 4.0 mm height was prepared and each CR was filled in a darkroom to prepare cylindrical sample. The specimen was soaked in acetone immediately after curing, and the unpolymerized parts of the CR were removed. The residual volume of each specimen was measured after removing the unpolymerized CR. Results: As a result of visual evaluation, a significant difference in the state of gap and crack generation was observed in the MBH and MBF Groups compared to the MGF Group, and in the EBH and EBF Groups compared to the EGF Group (p< 0.05). The MGF and EGF Groups showed gaps at the cavity floor. In addition, the bond strength of the MBF Group was significantly higher than those of the MBH and MGF Groups (p< 0.05). The bond strengths of the EBF Group and EGF Group were significantly higher than that of the EBH Group (p< 0.05). Although the residual volume of BH and BF were significantly larger than those of GF, there was no significant difference between BH and BF (p< 0.05). Conclusion: The results indicated that care is needed during the filling operation of bulk filling with bulk-fill CRs, as the problems caused by polymerization contraction stress are not completely eliminated in high C-factor cavities, even though it is effective for the bonding of deep cavities. |
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| 学位名 | ||||||||||||
| 学位名 | 博士（歯学） | |||||||||||
| 学位授与機関 | ||||||||||||
| 学位授与機関識別子Scheme | kakenhi | |||||||||||
| 学位授与機関識別子 | 34408 | |||||||||||
| 学位授与機関名 | 大阪歯科大学 | |||||||||||
| 学位授与年月日 | ||||||||||||
| 学位授与年月日 | 2021-03-05 | |||||||||||
| 学位授与番号 | ||||||||||||
| 学位授与番号 | 甲第899号 | |||||||||||
