A light curing method for improving marginal sealing and cavity wall adaptation of resin composite restorations.
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| Title: | A light curing method for improving marginal sealing and cavity wall adaptation of resin composite restorations. |
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| Authors: | Yoshikawa, Takako1, Burrow, Michael F.2, Tagami, Junji1 |
| Source: | Dental Materials. Jul2001, Vol. 17 Issue 4, p359-366. 8p. 4 Charts, 1 Graph. |
| Subjects: | Dental resins, Dental pulp cavities, Dental materials, Dental bonding, Polymerization |
| Abstract: | Objective: The aim of this study was to evaluate whether the method of light curing could influence: (a) marginal sealing and resin composite adaptation to the cavity wall; (b) polymerization contraction rate; and (c) the hardness at the top and bottom surfaces of a body of resin composite. Methods: Standard cylindrical cavities, 1 mm deep and 3 mm in diameter were prepared on flat superficial dentin surfaces in bovine teeth. The teeth were bonded with one of two adhesive systems (Clearfil Photo Bond, and Super-Bond D Liner) and filled with a hybrid resin composite. The resins were cured using three light intensities of 600, 270 and 20 mW/cm², and various curing times. After thermal cycling. In addition, using the same curing conditions, the rate of polymerization contraction was measured. The difference of hardness over time of composite specimens was measured using Knoop hardness measurements taken at the top and bottom surfaces of resin specimens made in a Teflon mold the same dimensions as the cavity prepared in dentin. Results: When the composite was light cured with an initial light intensity of 270 mW/cm² for 10 s, a 5 s interval then a light intensity of 600 mW/cm² for 50 s, the best marginal sealing and cavity wall adaptation was observed compared with the other curing modes. Earlier hardening occurred at the resin composite base compared with the top surface of the composite, and most of the polymerization contraction was completed during the initial flowable stage of the resin composite. All other methods demonstrated results with some degree of marginal opening and cavity wall gap formation, the worst being 600 mW/s for 60 s. Significance: The use of a low initial light intensity (270 mW/cm²) for 10 s followed by high intensity light (600 mW/cm²) for 50 s provides the best adaptation of resin composite to cavity walls and possibly the least polymerization contraction stress. [ABSTRACT FROM AUTHOR] |
| Copyright of Dental Materials is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) | |
| Database: | Engineering Source |
| FullText | Text: Availability: 0 |
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| Header | DbId: egs DbLabel: Engineering Source An: 51195381 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
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| Items | – Name: Title Label: Title Group: Ti Data: A light curing method for improving marginal sealing and cavity wall adaptation of resin composite restorations. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Yoshikawa%2C+Takako%22">Yoshikawa, Takako</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Burrow%2C+Michael+F%2E%22">Burrow, Michael F.</searchLink><relatesTo>2</relatesTo><br /><searchLink fieldCode="AR" term="%22Tagami%2C+Junji%22">Tagami, Junji</searchLink><relatesTo>1</relatesTo> – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22Dental+Materials%22">Dental Materials</searchLink>. Jul2001, Vol. 17 Issue 4, p359-366. 8p. 4 Charts, 1 Graph. – Name: Subject Label: Subjects Group: Su Data: <searchLink fieldCode="DE" term="%22Dental+resins%22">Dental resins</searchLink><br /><searchLink fieldCode="DE" term="%22Dental+pulp+cavities%22">Dental pulp cavities</searchLink><br /><searchLink fieldCode="DE" term="%22Dental+materials%22">Dental materials</searchLink><br /><searchLink fieldCode="DE" term="%22Dental+bonding%22">Dental bonding</searchLink><br /><searchLink fieldCode="DE" term="%22Polymerization%22">Polymerization</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: Objective: The aim of this study was to evaluate whether the method of light curing could influence: (a) marginal sealing and resin composite adaptation to the cavity wall; (b) polymerization contraction rate; and (c) the hardness at the top and bottom surfaces of a body of resin composite. Methods: Standard cylindrical cavities, 1 mm deep and 3 mm in diameter were prepared on flat superficial dentin surfaces in bovine teeth. The teeth were bonded with one of two adhesive systems (Clearfil Photo Bond, and Super-Bond D Liner) and filled with a hybrid resin composite. The resins were cured using three light intensities of 600, 270 and 20 mW/cm², and various curing times. After thermal cycling. In addition, using the same curing conditions, the rate of polymerization contraction was measured. The difference of hardness over time of composite specimens was measured using Knoop hardness measurements taken at the top and bottom surfaces of resin specimens made in a Teflon mold the same dimensions as the cavity prepared in dentin. Results: When the composite was light cured with an initial light intensity of 270 mW/cm² for 10 s, a 5 s interval then a light intensity of 600 mW/cm² for 50 s, the best marginal sealing and cavity wall adaptation was observed compared with the other curing modes. Earlier hardening occurred at the resin composite base compared with the top surface of the composite, and most of the polymerization contraction was completed during the initial flowable stage of the resin composite. All other methods demonstrated results with some degree of marginal opening and cavity wall gap formation, the worst being 600 mW/s for 60 s. Significance: The use of a low initial light intensity (270 mW/cm²) for 10 s followed by high intensity light (600 mW/cm²) for 50 s provides the best adaptation of resin composite to cavity walls and possibly the least polymerization contraction stress. [ABSTRACT FROM AUTHOR] – Name: AbstractSuppliedCopyright Label: Group: Ab Data: <i>Copyright of Dental Materials is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.) |
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| RecordInfo | BibRecord: BibEntity: Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 8 StartPage: 359 Subjects: – SubjectFull: Dental resins Type: general – SubjectFull: Dental pulp cavities Type: general – SubjectFull: Dental materials Type: general – SubjectFull: Dental bonding Type: general – SubjectFull: Polymerization Type: general Titles: – TitleFull: A light curing method for improving marginal sealing and cavity wall adaptation of resin composite restorations. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Yoshikawa, Takako – PersonEntity: Name: NameFull: Burrow, Michael F. – PersonEntity: Name: NameFull: Tagami, Junji IsPartOfRelationships: – BibEntity: Dates: – D: 01 M: 07 Text: Jul2001 Type: published Y: 2001 Identifiers: – Type: issn-print Value: 01095641 Numbering: – Type: volume Value: 17 – Type: issue Value: 4 Titles: – TitleFull: Dental Materials Type: main |
| ResultId | 1 |
