Impact of Different Etching Strategies on Margin Integrity of Conservative Composite Restorations in Demineralized Enamel
Good margin integrity with a tight seal of the adhesive interface is considered one of the key factors for the clinical success of composite restorations. This study investigated the effect of enamel etching with phosphoric acid on the margin integrity of self-etch bonded composite restorations in d...
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doaj-f1ed143848b34322a05e2bf95ff684352020-11-25T03:53:47ZengMDPI AGMaterials1996-19442020-10-01134500450010.3390/ma13204500Impact of Different Etching Strategies on Margin Integrity of Conservative Composite Restorations in Demineralized EnamelMohamed El Gedaily0Thomas Attin1Daniel B. Wiedemeier2Tobias T. Tauböck3Department of General, Special Care, and Geriatric Dentistry, Center for Dental Medicine, University of Zurich, 8032 Zurich, SwitzerlandDepartment of Conservative and Preventive Dentistry, Center for Dental Medicine, University of Zurich, 8032 Zurich, SwitzerlandStatistical Services, Center for Dental Medicine, University of Zurich, 8032 Zurich, SwitzerlandDepartment of Conservative and Preventive Dentistry, Center for Dental Medicine, University of Zurich, 8032 Zurich, SwitzerlandGood margin integrity with a tight seal of the adhesive interface is considered one of the key factors for the clinical success of composite restorations. This study investigated the effect of enamel etching with phosphoric acid on the margin integrity of self-etch bonded composite restorations in demineralized enamel. Crowns of bovine incisors were assigned into 14 groups (n = 10 per group) of which ten groups (groups 1–5 and 8–12) were demineralized (21 days, acid buffer, pH 4.95) to create artificial carious lesions. Standardized Class V cavities were prepared in all specimens. Demineralized groups were either etched with phosphoric acid for 10, 30, 60, or 120 s (groups 2–5 and 9–12), or no etching was performed (groups 1 and 8). The non-demineralized (sound) groups were etched for 10 s (groups 7 and 14) or remained non-etched (groups 6 and 13). Resin composite restorations were then placed using either a one-step (iBond Self Etch, groups 1–7) or two-step self-etch adhesive (Clearfil SE Bond, groups 8–14). Margin integrity of the restorations was assessed after thermocycling (5000×, 5–55 °C) using scanning electron microscopy, and the percentage of continuous margins (%CM) was statistically analyzed (α = 0.05). Phosphoric acid etching significantly increased %CM in both demineralized and sound enamel. For iBond Self Etch, a significant increase in %CM in demineralized enamel was observed with increased etching times. All etched groups treated with Clearfil SE Bond and those etched for 60 or 120 s and treated with iBond Self Etch showed similar %CM in demineralized enamel as in etched sound enamel, and significantly higher %CM than in non-etched sound enamel. In conclusion, enamel etching with phosphoric acid improves margin integrity of composite restorations in demineralized enamel when bonded with the examined adhesives.https://www.mdpi.com/1996-1944/13/20/4500demineralized enamelmarginal adaptationphosphoric acid etchingresin compositeself-etch adhesives |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Mohamed El Gedaily Thomas Attin Daniel B. Wiedemeier Tobias T. Tauböck |
spellingShingle |
Mohamed El Gedaily Thomas Attin Daniel B. Wiedemeier Tobias T. Tauböck Impact of Different Etching Strategies on Margin Integrity of Conservative Composite Restorations in Demineralized Enamel Materials demineralized enamel marginal adaptation phosphoric acid etching resin composite self-etch adhesives |
author_facet |
Mohamed El Gedaily Thomas Attin Daniel B. Wiedemeier Tobias T. Tauböck |
author_sort |
Mohamed El Gedaily |
title |
Impact of Different Etching Strategies on Margin Integrity of Conservative Composite Restorations in Demineralized Enamel |
title_short |
Impact of Different Etching Strategies on Margin Integrity of Conservative Composite Restorations in Demineralized Enamel |
title_full |
Impact of Different Etching Strategies on Margin Integrity of Conservative Composite Restorations in Demineralized Enamel |
title_fullStr |
Impact of Different Etching Strategies on Margin Integrity of Conservative Composite Restorations in Demineralized Enamel |
title_full_unstemmed |
Impact of Different Etching Strategies on Margin Integrity of Conservative Composite Restorations in Demineralized Enamel |
title_sort |
impact of different etching strategies on margin integrity of conservative composite restorations in demineralized enamel |
publisher |
MDPI AG |
series |
Materials |
issn |
1996-1944 |
publishDate |
2020-10-01 |
description |
Good margin integrity with a tight seal of the adhesive interface is considered one of the key factors for the clinical success of composite restorations. This study investigated the effect of enamel etching with phosphoric acid on the margin integrity of self-etch bonded composite restorations in demineralized enamel. Crowns of bovine incisors were assigned into 14 groups (n = 10 per group) of which ten groups (groups 1–5 and 8–12) were demineralized (21 days, acid buffer, pH 4.95) to create artificial carious lesions. Standardized Class V cavities were prepared in all specimens. Demineralized groups were either etched with phosphoric acid for 10, 30, 60, or 120 s (groups 2–5 and 9–12), or no etching was performed (groups 1 and 8). The non-demineralized (sound) groups were etched for 10 s (groups 7 and 14) or remained non-etched (groups 6 and 13). Resin composite restorations were then placed using either a one-step (iBond Self Etch, groups 1–7) or two-step self-etch adhesive (Clearfil SE Bond, groups 8–14). Margin integrity of the restorations was assessed after thermocycling (5000×, 5–55 °C) using scanning electron microscopy, and the percentage of continuous margins (%CM) was statistically analyzed (α = 0.05). Phosphoric acid etching significantly increased %CM in both demineralized and sound enamel. For iBond Self Etch, a significant increase in %CM in demineralized enamel was observed with increased etching times. All etched groups treated with Clearfil SE Bond and those etched for 60 or 120 s and treated with iBond Self Etch showed similar %CM in demineralized enamel as in etched sound enamel, and significantly higher %CM than in non-etched sound enamel. In conclusion, enamel etching with phosphoric acid improves margin integrity of composite restorations in demineralized enamel when bonded with the examined adhesives. |
topic |
demineralized enamel marginal adaptation phosphoric acid etching resin composite self-etch adhesives |
url |
https://www.mdpi.com/1996-1944/13/20/4500 |
work_keys_str_mv |
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