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Document Type |
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Project |
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Document Title |
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Improvement of dentin bonding agent for direct composite : تحسين الحشوات الجمالية للأسنان بإعادة تركيب المواد اللاصقة بها |
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Subject |
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Oral and Maxillofacial Rehabilitation |
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Document Language |
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Arabic |
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Abstract |
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tooth/restoration interface which may lead to marginal integrity breakdown, microleakage, and staining and secondary caries.
Purpose. The purpose of this study was to determine if fluorinated dental bonding resins will reduce composite resin marginal microleakage
Materials and Methods. Light-cure filled (F) and unfilled (U) bonding resins were prepared from a basis resin of 45% bis-EMA, 40% TEGDMA, and 15% HEMA. Fluorinated TEGDMA (f), 0-30 wt% was substituted for some TEGDMA as shown in the table. Class V restorations were made in 50 extracted human molar teeth, 3 mm length X 2 mm width X 1.5 mm depth centered on the cementoenamel junction using these 8 experimental formulations and 2 commercial bonding resins (n = 5), OptiBond Solo Plus (OB, Kerr) and All-Bond 2 (AB, Bisco) following a standard clinical protocol. The teeth were thermocycled 1500 times between 5 °C and 55 °C wirh 1-minute dwell times. Teeth were removed, dried, varnished, and placed in 50 w/v% silver nitrate solution at 37 °C for 24 hours in total darkness. The teeth were rinsed and sectioned through the restorations with a wafering saw yielding haves. For each half, dye penetration was assessed at X80 and measured in mm from margin to axial wall for occlusal (O) and cervical (C) margins.
Result. Mean depths of dye penetration shown in the table.
R1F0f R1U0f R2F17f R2U17f R3F30f R3U30f R4F24f R4U24f OB AB
O .35±.5 .28±.5 .52±.7 .76±.7 .94±.4 1.1±.4 .61±.5 .64±.6 .06±.2 .6±.3
C .69±.5 .73±.5 .84±.7 .92±.6 1.1±.2 1.1±.4 .82±.3 .72±.5 .33±.5 .29±.4
The data was analyzed statistically (p<0.05) using ANOVA. At the occlusal margins, all R1, OB, and AB leaked significantly less than the fluorinated composite resins. At the cervical margins, OB and AB leaked significantly less than all other groups.
Conclusion. Fluorinated TEGDMA did not reduce microleakage of composite resins.
Statement of problem. The durability of a restoration is largely based on maintenance of the
Microleakage of fluorinated experimental dentin bonding agents for composite resin restorations |
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Publishing Year |
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1425 AH
2005 AD |
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Added Date |
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Saturday, November 7, 2009 |
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Researchers
| محمد فرج عيد | Ayad, Mohamed Farag | Investigator | Doctorate | |
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