The effect of microwave/laboratory light source postcuring technique and wet-aging on microhardness of composite resin
Background: Although composite restorations are really valuable for esthetic zones, they have shown less longevity rather than amalgam restorations. Since it may be related to the method used for curing the composite, postcuring could increase the degree of conversion and result in more long-lasting...
| Main Authors: | , |
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| Format: | Article |
| Language: | English |
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Wolters Kluwer Medknow Publications
2013-01-01
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| Series: | Dental Research Journal |
| Subjects: | |
| Online Access: | http://www.drjjournal.net/article.asp?issn=1735-3327;year=2013;volume=10;issue=3;spage=370;epage=375;aulast=Sharafeddin |
| _version_ | 1819154166146138112 |
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| author | Farahnaz Sharafeddin Elham Sharifi |
| author_facet | Farahnaz Sharafeddin Elham Sharifi |
| author_sort | Farahnaz Sharafeddin |
| collection | DOAJ |
| description | Background: Although composite restorations are really valuable for esthetic zones, they have shown less longevity rather than amalgam restorations. Since it may be related to the method used for curing the composite, postcuring could increase the degree of conversion and result in more long-lasting composite restorations. This study was planned to evaluate the effect of two different postcuring techniques on microhardness of indirect composite resin after wet-aging and comparing them with the direct type.
Materials and Methods: In this experimental study, 99 composite disk-shaped (6.5 × 2.5 mm) specimens of composite (Gradia GC, Japan) were prepared in split mold. The indirect composite specimens were postcured by laboratory light source (Labolite LV-III GC Corp, Japan) or microwave unit (MC 2002 JR, LG, Korea). Then, the aging procedure was done for 24 h, 30 and 180 days in distilled water. The Vicker′s Hardness test (VHN) on surface of specmens was measured by Wolpert microhardness tester and the data were analyzed by the two-way analysis of variance (ANOVA) and Tukey′s post hoc tests. (P ≤ 0.05).
Results: The statistical analysis revealed that surface microhardness of postcured composite by microwave and laboratory light source was more than that of direct composite ( P = 0.0001) and postcuring by microwave was more effective than postcuring by laboratory light source ( P = 0.004). The 30 days stored composite demonstrated significant decrease of VHN compared with the 24-h stored samples ( P = 0.0001), with a more significant VHN decrease after 180 days of aging ( P = 0.045).
Conclusion: Postcuring increased the surface microhardness and aging reduced the surface microhardness of indirect composite. |
| first_indexed | 2024-12-22T15:16:45Z |
| format | Article |
| id | doaj.art-3bc74cb37ee4452fb576696b2f78debe |
| institution | Directory Open Access Journal |
| issn | 1735-3327 2008-0255 |
| language | English |
| last_indexed | 2024-12-22T15:16:45Z |
| publishDate | 2013-01-01 |
| publisher | Wolters Kluwer Medknow Publications |
| record_format | Article |
| series | Dental Research Journal |
| spelling | doaj.art-3bc74cb37ee4452fb576696b2f78debe2022-12-21T18:21:43ZengWolters Kluwer Medknow PublicationsDental Research Journal1735-33272008-02552013-01-0110337037510.4103/1735-3327.115149The effect of microwave/laboratory light source postcuring technique and wet-aging on microhardness of composite resinFarahnaz SharafeddinElham SharifiBackground: Although composite restorations are really valuable for esthetic zones, they have shown less longevity rather than amalgam restorations. Since it may be related to the method used for curing the composite, postcuring could increase the degree of conversion and result in more long-lasting composite restorations. This study was planned to evaluate the effect of two different postcuring techniques on microhardness of indirect composite resin after wet-aging and comparing them with the direct type. Materials and Methods: In this experimental study, 99 composite disk-shaped (6.5 × 2.5 mm) specimens of composite (Gradia GC, Japan) were prepared in split mold. The indirect composite specimens were postcured by laboratory light source (Labolite LV-III GC Corp, Japan) or microwave unit (MC 2002 JR, LG, Korea). Then, the aging procedure was done for 24 h, 30 and 180 days in distilled water. The Vicker′s Hardness test (VHN) on surface of specmens was measured by Wolpert microhardness tester and the data were analyzed by the two-way analysis of variance (ANOVA) and Tukey′s post hoc tests. (P ≤ 0.05). Results: The statistical analysis revealed that surface microhardness of postcured composite by microwave and laboratory light source was more than that of direct composite ( P = 0.0001) and postcuring by microwave was more effective than postcuring by laboratory light source ( P = 0.004). The 30 days stored composite demonstrated significant decrease of VHN compared with the 24-h stored samples ( P = 0.0001), with a more significant VHN decrease after 180 days of aging ( P = 0.045). Conclusion: Postcuring increased the surface microhardness and aging reduced the surface microhardness of indirect composite.http://www.drjjournal.net/article.asp?issn=1735-3327;year=2013;volume=10;issue=3;spage=370;epage=375;aulast=SharafeddinComposite resinlaboratory light sourcelabolitemicrohardnessmicrowavepostcurewet-aging |
| spellingShingle | Farahnaz Sharafeddin Elham Sharifi The effect of microwave/laboratory light source postcuring technique and wet-aging on microhardness of composite resin Dental Research Journal Composite resin laboratory light source labolite microhardness microwave postcure wet-aging |
| title | The effect of microwave/laboratory light source postcuring technique and wet-aging on microhardness of composite resin |
| title_full | The effect of microwave/laboratory light source postcuring technique and wet-aging on microhardness of composite resin |
| title_fullStr | The effect of microwave/laboratory light source postcuring technique and wet-aging on microhardness of composite resin |
| title_full_unstemmed | The effect of microwave/laboratory light source postcuring technique and wet-aging on microhardness of composite resin |
| title_short | The effect of microwave/laboratory light source postcuring technique and wet-aging on microhardness of composite resin |
| title_sort | effect of microwave laboratory light source postcuring technique and wet aging on microhardness of composite resin |
| topic | Composite resin laboratory light source labolite microhardness microwave postcure wet-aging |
| url | http://www.drjjournal.net/article.asp?issn=1735-3327;year=2013;volume=10;issue=3;spage=370;epage=375;aulast=Sharafeddin |
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